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April 7-14, 2012

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WWND 2012 Attendees
(Registered attendees as of Feb 13th, 2012)

  1. ===========================
    E-Mail: hleon@ikf.uni-frankfurt.de
    Name: Hermes Leon Vargas
    Institution: University of Frankfurt
    Address: Institut fuer Kernphysik Max-von-Laue-Str. 1 60438 Frankfurt am Main Germany
    Title: Connecting the underlying event with jet properties in pp collisions at √s = 7 TeV with the ALICE experiment
    Abstract: We present results of Underlying Event (UE) measurements in pp collisions at √s = 7 TeV. The evolution of the UE is studied as a function of the hard scale, estimated from the highest single track pT in the event. Then we present a preliminary study of the properties of charged particle jets as a function of the Underlying Multiplicity (UM). The UM is defined such that it could be related to the global soft event characteristics. The measurement of jet properties as a function of the UM may provide insight in the transverse nucleon structure, related to Generalized Parton Distributions. The results from the studies are compared to Monte Carlo models.
  2. ===========================
    E-Mail: jbook@ikf.uni-frankfurt.de
    Name: Julian Book
    Institution: Goethe University of Frankfurt
    Address: Institut fuer Kernphysik Max-von-Lauestraße 1 60438 Frankfurt am Main 
    Title: J/psi measurements with the ALICE experiment at the LHC
    Abstract: The ALICE detector provides excellent capabilities to study quarkonium production in proton-proton (pp) and heavy-ion (A-A) collisions at the Large Hadron Collider (LHC). Quarkonia, bound states of heavy (charm or bottom) quark anti-quark pairs such as the J/psi, are expected to be produced by hard processes. Thus they will provide insights into the earliest and hottest stages of A-A collisions where the formation of a Quark-Gluon Plasma is expected. Furthermore high-precision data from pp collisions represent an essential baseline for the measurement of nuclear modifications in heavy-ions and serve also as a crucial test for several models of quarkonium hadroproduction. In ALICE, J/psi are measured down to pT = 0, via their e+e- decay channel in the central barrel (|y| < 0.9) and via mu+mu- in the muon spectrometer (2.5 < y < 4.0). Results of the inclusive and prompt J/psi production cross section in pp collisions at sqrt(s) = 7 and 2.76 TeV will be presented. A po
    larization measurement in the forward region.
  3. ===========================
    E-Mail: neufeld@lanl.gov
    Name: Bryon Neufeld
    Institution: Los Alamos National Lab
    Address: Los Alamos, New Mexico 
    Title: The Z-tagged jet event asymmetry in heavy-ion collisions at the CERN Large Hadron Collider
    Abstract: Tagged jet measurements provide a promising experimental channel to quantify the similarities and differences in the mechanisms of jet production in proton-proton and nucleus-nucleus collisions. I present the first calculation of the transverse momentum asymmetry of Z/gamma*-tagged jet events in sqrt{s} = 2.76 TeV reactions at the LHC. Our results combine the NLO perturbative cross sections with the radiative and collisional processes that modify parton showers in the presence of dense QCD matter. I find that a strong asymmetry is generated in central lead-lead reactions that has little sensitvity to the fluctuations of the underlying soft hadronic background. I present theoretical model predictions for its shape and magnitude.
  4. ===========================
    E-Mail: egarcia@csu.edu
    Name: Edmundo Garcia
    Institution: Chicago State University
    Address: 9501 S. King Drive. SCI # 309 Chicago IL 60628 
    Title: A Very High Momentum Particle Identification Detector for the ALICE experiment at the LHC.
    Abstract: The purpose of the ALICE experiment is the study of the quark-gluon plasma (QGP) in heavy ion collisions at LHC. To this end ALICE has unique PID capability to identify a wide variety of particles in the low to intermediate momentum range. We propose to enhance these capabilities with the construction of the Very High Momentum Particle Identification Detector (VHMPID), improving the identification of charged pions, kaons, protons and anti protons in the momentum range 5 GeV/c < p < 25 GeV/c on a track-by-track basis. This upgrade provides ALICE with new opportunities to study parton-medium interactions at LHC energies. The underlying physics and the relevant degrees of freedom in the QGP, are not known and generally approximated schematically on the basis of lattice quantum chromo dynamic calculations. Only specific experimental evidence of the modification of the harmonization process will enable us to constrain the schematic models and gain a deeper understanding
    of the fundamental process of hadron format
  5. ===========================
    E-Mail: rbailhache@ikf.uni-frankfurt.de
    Name: Raphaelle Bailhache
    Institution: Goethe Universitaet Frankfurt
    Address: Goethe Universitaet Frankfurt Institut für Kernphysik Max-von-Laue-Str. 1 60438 Frankfurt am Main Germany
    Title: Open heavy-flavour measurements in Pb-Pb collisions at √s = 2.76 TeV per nucleon pair with ALICE
    Abstract: In ultra-relativistic heavy-ion collisions, heavy quarks, i.e charm and beauty, are produced in the early stage of the reaction. Therefore, they are uniquely suited to probe the Quark-Gluon-plasma (QGP), which is formed in such reactions, and to study the parton-medium interactions. In 2010 and 2011, Pb-Pb collisions at √s=2.76 TeV per nucleon pair have been recorded by ALICE at the LHC. We present results of open heavy-flavour production using hadronic D meson decays, as well as semi-electronic and semi-muonic decays of D and B mesons. The corresponding nuclear modification factors are measured as a function of the transverse momentum and the collision centrality in the ALICE central-barrel at mid-rapidity and in the forward muon detector. First elliptic flow measurements are also shown.
    comments: Raphaelle Bailhache on behalf of the ALICE collaboration
  6. ===========================
    E-Mail: Wolfgang.Cassing@theo.physik.uni-giessen.de
    Name: Wolfgang Cassing
    Institution: University of Giessen
    Address: Institute of Theoretical Physics Heinrich-Buff-Ring 16 D-35392 Giessen Germany
    Title: Collective properties of nucleus-nucleus collisions from AGS to LHC energies
    Abstract: We report on recent studies of collective flow coefficients v_2, v_3 and v_4 in the azimuthal angular distribution of charged particles in heavy-ion collisions from AGS to LHC energies within the PHSD transport approach which incorporates dynamical partonic as well as hadronic degrees-of-freedom. The computational results are compared to data of the experimental collaborations whenever possible. In addition we explore the possible observation of the Chiral Magnetic Effect (CME) at all energies including retarded electromagnetic fields - as generated by the electric charge currents - as well as their back-reaction on the particle propagation.
    comments: Sharing room with E. Bratkovskaya and Marie Cassing
  7. ===========================
    E-Mail: Elena.Bratkovskaya@th.physik.uni-frankfurt.de
    Name: Elena Bratkovskaya
    Institution: ITP&FIAS, Uni. Frankfurt
    Address: Frankfurt Institute for Advanced Studies, Goethe University Ruth-Moufang-Str. 1 60438 Frankfurt am Main Germany
    Title: Dilepton production from SIS to LHC energies
    Abstract: We report on recent studies of dilepton production in pp and heavy-ion collisions from SIS to LHC energies within the PHSD transport approach which incorporates dynamical partonic as well as hadronic degrees-of-freedom. The dilepton production form the partonic channels are evaluated on the basis of the same propagators as those employed in the PHSD transport approach while the hadronic production channels are identical to those in the HSD model that has been well tested at lower bombarding energies. We compare to the NA60 data for In+In reactions at 158 A GeV as well as to the PHENIX and STAR results at the top RHIC energies. Detailed predictions are presented for Pb+Pb collisions at the LHC energy of 2.76 TeV
  8. ===========================
    E-Mail: aichelin@subatech.in2p3.fr
    Name: Joerg Aichelin
    Institution: SUBATECH
    Address:  4, rue A. Kastler BP 20722 44307 Nantes Cedex 03
    Title: Energy loss of heavy quarks at RHIC and LHC energies
    Abstract: T.B.A.
  9. ===========================
    E-Mail: stoecker@gsi.de; s.jeske@gsi.de
    Name: Prof. Horst STOECKER
    Institution: GSI Helmholtzzentrum
    Address: Planckstr.1 64291 Darmstadt
    Title: T.B.A.
    Abstract: T.B.A.
  10. ===========================
    E-Mail: axel.drees@stonybrook.edu
    Name: Axel Drees
    Institution: Stony Brook University
    Address: Stony Brook, New York, USA
    Title: Open Heavy Flavor in pp, dAu, and AA; results from PHENIX
    Abstract: T.B.A.
  11. ===========================
    E-Mail: jjia@bnl.gov
    Name: Jiangyong Jia
    Institution: Stony Brook University and BNL
    Address:  Chemistry Department Stony Brook University Stony Brook NY, 11790
    Title: Measurement of dipolar flow associated with initial density fluctuations in Pb-Pb collisions from ATLAS
    Abstract: A new method for extracting the dipolar flow (v_1) associated with initial density fluctuations is presented using the 2010 Pb-Pb data. The dipolar flow is extracted as function of pT and centrality. This result is compared with model calculations from a multi-phase transport model. The implications of this result on improving our understanding of the nature of the initial dipole asymmetry and dynamical evolution of the medium are discussed.
  12. ===========================
    E-Mail: lgmoretto@lbl.gov
    Name: Luciano G. Moretto
    Institution: LBNL and UCB
    Address:  Lawrence Berkeley national laboratory Bldg 88 Berkeley, Ca 94720
    Title: Finite size fluctuations and critica behavior
    Abstract: The Ising Model exemplifies how finite size effects can mimic critical fluctuations.
  13. ===========================
    E-Mail: Jamal.Jalilian-Marian@baruch.cuny.edu
    Name: Jamal Jalilian-Marian
    Institution: Baruch College
    Address: A506 Dept. of Natural Sciences Baruch College 17 Lexington Ave. New York, NY 10010
    Title: Di-hadron angular correlation: rapidity evolution
    Abstract: Di-hadron angular correlation in the forward rapidity region in pA collisions probe multi-gluon component of the target nucleus wave function. Evolution equations for these multi-gluon correlators are derived and shown to reduce to the BFKL and BJKP equations in the appropriate limits. The effect of rapidity evolution vs. multiple scattering on di-hadron angular correlation is discussed.
    Comments: Due to limited travel budget, I'd like to ask for financial assistance if possible.
  14. ===========================
    E-Mail: m.weber@cern.ch
    Name: Weber Michael
    Institution: University of Houston
    Address: University of Houston, Physics Department 617 Science & Research Building 1 Houston, TX 77204 
    Title: Balance function studies for non–identified particles in Pb–Pb collisions at √sNN = 2.76 TeV
    Abstract: With the creation of a strongly interacting deconfined phase (Quark-Gluon plasma) in rel- ativistic heavy ion collisions, a delayed hadronization time would be measurable. It was proposed to test this hypothesis via the measurement of correlations between positive and negatively charged pairs pairs as a function of rapidity, the so-called Balance functions; this analysis was performed so far at SPS and RHIC energies. We will present first stud- ies of Balance functions at LHC energies with the ALICE experiment. In Pb–Pb collisions at √sNN = 2.76 TeV the width of Balance functions in pseudorapidity for non-identified charged particles shows a clear centrality dependence. In addition comparisons to other ex- periments (NA49, STAR) at lower c.m. energies and different models (Hijing, AMPT, Blast wave) will be presented.
  15. ===========================
    E-Mail: werner@subatech.in2p3.fr
    Name: WERNER, Klaus
    Institution: University of Nantes
    Address:  4 rue Alfred Kastler, BP 20722 44307 Nantes Cedex 3, France
    Title: Separating jets from bulk matter in heavy ion collisions at the LHC
    Abstract: We discuss recent progress in the "fluxtube & hydro" approach for heavy ion collisions at the LHC. We try to understand in particular particle production at intermediate transverse momenta.
  16. ===========================
    E-Mail: moshe.gai@yale.edu
    Name: Moshe Gai
    Institution: Yale and UConn
    Address:  1084 Shennecossett Rd Groton, CT 06340
    Title: The Science of Home Land Security
    Abstract: We will discuss the need and in some cases the development, of Nuclear Detection Technologies to secure the borders against smuggling of Special Nuclear Materials (SNM).
  17. ===========================
    E-Mail: petreczk@bnl.gov
    Name: Peter Petreczky
    Institution: BNL
    Address: Bldg. 510, BNL Upton NY 11973
    Title: Recent progress in finite temperature QCD on the lattice
    Abstract: I will discuss recent progress made in lattice QCD on studying the chiral and deconfinement transition, equation of state and quarkonium spectral functions. I will also discuss the comparison of lattice QCD results to the prediction of the Hadron Resonance Gas model at low temperatures.
  18. ===========================
    E-Mail: drischke@th.physik.uni-frankfurt.de
    Name: Dirk Rischke
    Institution: Goethe University
    Address: Institut f. Theoretische Physik Johann Wolfgang Goethe-Universitaet Max-von-Laue-Str. 1 D-60438 Frankfurt am Main Germany
    Title: TBA
    Abstract: TBA
  19. ===========================
    E-Mail: carsten.greiner@th.physik.uni-frankfurt.de
    Name: Prof. Carsten Greiner
    Institution: University Frankfurt
    Address: ITP, University of Frankfurt, Max von Laue Str. 1 60438 Frankfurt, Germany
    Title: tba
    Abstract: tba
  20. ===========================
    E-mail: rhollis@ucr.edu
    Name: Richard Hollis
    Institution: University of California, Riverside
    Address: Brookhaven National Laboratory, Building 510, c/o PHENIX Upton, NY 11973
    Title: W Asymmetry as a Probe of Sea Quark Polarization
    Abstract:I will present the current analysis status of the parity violating longitudinal single-spin asymmetries (A_L) measurements in PHENIX which are observed in the production of W bosons in 500 GeV p+p collisions at RHIC. For this, weakly decaying W+(-)->mu+(-)+nu(bar) directly probe the sea quark contribution to the proton's spin via their leading order production in hard scattered u+dbar->W+ (ubar+d->W-) interactions. The single-spin asymmetries in the resultant mu+(-) are expected to be large in magnitude at high rapidity, yet opposite in sign. Measuring muons in the PHENIX (forward) muon arms has required an upgrade of this spectrometer to facilitate an on-line event selection of high-momentum tracks coupled with the addition of a new RPC detector which provides a time/position stamp for each event. I will present the status of this new measurement in terms of A_L and cross-section from Run 11, where the first stage of the upgrades were in place, and discuss the outlook for the new Run 12 data, where the upgrades are fully operational.
  21. ===========================
    E-mail: kenneth.barish@ucr.edu
    Name: Kenneth N. Barish
    Institution: UC Riverside
    Address: Dept. of Physics & Astronomy 900 University Ave University of California, Riverside Riverside, CA 92521
    Title: sPHENIX spin and forward physics
    Abstract: T.B.A.
  22. ===========================
    Email: soumya@cern.ch
    Name: Soumya Mohapatra
    Institution: Stony Brook University
    Address: Physics and Astronomy Department Stony Brook University Stony Brook, NY 11794-3800
    Title: Measurement of elliptic and higher order flow harmonics at $\sqrt{s_{NN}}=2.76TeV$ Pb-Pb collisions from ATLAS
    Abstract: The flow harmonics $v_n$ are important bulk observables in heavy ion collisions. They contain information about the initial geometry as well as the transport properties of the medium produced in heavy ion collisions. We present the detailed measurements of flow harmonics $v_2$-$v_6$ using the EP method and two particle correlations method in broad $p_T$, $\eta$ and centrality ranges using the 2010 Pb+Pb data from ATLAS. The phase space regions where the two methods areconsistent and where they disagree will be discussed. This result provide new insights on the origin of the long range ridge structures over broad $\pT$ ranges (soft and hard ridges).
  23. ===========================
    E-mail: holopainen@fias.uni-frankfurt.de
    Name: Hannu Holopainen
    Institution: Frankfurt Institute for Advanced Studies
    Address: Ruth-Moufang-Str. 1 60438 Frankfurt am Main Germany
    Title: Dynamical freeze-out in event-by-event hydrodynamics
    Abstract: Typically in the hydrodynamical modeling of the ultrarelativistic heavy-ion collisions the freeze-out is performed at a constant temperature. In this work we present a dynamical freeze-out criterion where the hydrodynamical expansion rate is compared with the pion-pion scattering rate. We present hadron spectra and elliptic flow results from (2+1)-dimensional ideal hydrodynamics with dynamical freeze-out criterion and discuss the differences between constant temperature and dynamical freeze-out criterions. First we consider only smooth initial density profiles, but in the end we present some results with event-by-event initial density fluctuations.
  24. ===========================
    E-mail: mannel@bnl.gov
    Name: Eric Mannel
    Institution: Brookhaven National Laboratory
    Address: Brookhaven National Laboratory Physics Dept, Bldg 510C Upton, NY 11973
    Title: TBA
    Abstract: TBA
  25. ===========================
    E-mail: debbe@bnl.gov
    Name: Ramiro Debbe
    Institution: Brookhaven National Laboratory
    Address: BNL Building 510A Upton, NY 11973
    Title: Coherent Diffraction off Au Nuclei with vector mesons in the STAR UPC program
    Abstract: TBA
  26. ==========================
    E-email: linz@ecu.edu
    Name: Ziwei Lin
    Institution: East Carolina University
    Address: C-209 Howell Science Complex Department of Physics East Carolina University Greenville NC 27858-4353
    Title: Update of Initial Conditions in a Multiple Phase Transport (AMPT) Model
    Abstract: The AMPT model has been used to study many observables at RHIC and LHC energies. The initial conditions in AMPT are generated from the HIJING 1.0 model, which uses the Duke-Owens parton distribution functions (PDFs) together with a simple parameterization for strong nuclear shadowing. In order to reliably describe the space-time evolution, particle spectra and correlations in heavy ion collisions, the AMPT model needs to be updated with modern PDFs and their nuclear modifications. This is especially important at LHC energies, because heavy ion collisions at LHC energies probe parton distributions at very small x but the old Duke-Owens PDFs currently implemented in AMPT severely underestimate parton distributions at small x. In this talk we will present recent results in our effort to update the initial conditions, including the parton distribution functions and the nuclear shadowing functions, for the AMPT model.
  27. ============================
    E-mail: slash@bnl.gov
    Name: Cesar Luiz da Silva
    Institution: Los Alamos National Lab
    Address: LANL POBOX 1663 H846 Los Alamos NM 87544-0600
    Title: Upsilon and chi_C production, CNM and R_AA from PHENIX.
    A bstract: The color screening expected in quarkonia states when present in a hot and dense media has been exhaustively explored trough the J/psi state. However, J/psi yields are formed by around 40% of feed-down from Psi' and chi_c decays which is supposed to experiment the screening effects in a density and temperature different than the primary J/psi. Meanwhile, color screening of bottomonia can be used to probe an extended range of the temperature in the medium. This talk will present recent PHENIX measurements on excited states of charmonium and Upsilon(1S+2S+3S) in p+p, d+Au and Au+Au collisions at sqrt(S_{NN})=200 GeV as well as some discussion of the cold nuclear matter effects which may come along with the color screening effects. Prospects of future measurements with detector upgrades will also be discussed.
  28. ===========================
    E-mail: moschelli@fias.uni-frankfurt.de
    Name: George Moschelli
    Institution: Frankfurt Institute for Advanced Studies
    Address: Ruth-Moufang-Strasse 1 60438 Frankfurt am Main Germany
    Title: Flow Probes of Early Time Correlations
    Abstract: Correlation studies in relativistic heavy ion collisions suggest that final state multi-particle momentum correlations are linked to initial state correlations in coordinate space. Anisotropic collective expansion induces a correlation of all “flowing” particles with a global event plane defined by the initial geometrical shape of the collision volume. Spatially localized correlations also contribute to multi-particle correlation measurements but do not depend directly on the event plane although they are modified by the expansion of the system. We argue that the existence of spatially local correlations results in the observation of both v_n fluctuations and the ridge. We employ a framework in which flux tubes in an early CGC-Glasma stage later produce hydrodynamic flow and test the collision energy dependence of calculated flow fluctuation and ridge quantities against measured data.
  29. ===========================
    Name: Christina Markert
    Institution: University of Texas
    Address: Austin, Texas
    Title: Results on hadronic resonances in p+p and Pb-Pb collisions from the ALICE experiment at the LHC
    Abstract: Resonances can play a pivotal role in providing experimental evidence for partial chiral symmetry restoration in the deconfined quark-gluon phase produced at the LHC. Their lifetimes, which are comparable to the lifetime of the partonic plasma phase, make them a valuable tool to study medium modifications. Hadronic resonances are used to estimate the time span and hadronic interaction cross section in the hadronic phase between chemical and kinetic freeze-out. I will present the latest results of the measured resonances in elementary p+p and Pb-Pb collisions.
  30. ============================
    E mail: sprasad@cern.ch
    Name: Sidharth Kumar Prasad
    Institution: Wayne State University
    Address: 666 W Hancock Street (Room:324) Detroit, MI 48201 (US)
    Title: Charged Particle Jet measurement with the ALICE Experiment in pp collisions at the LHC
    Abstract: We will present the performance of four jet finder clustering algorithms: kt, anti-kt, SISCone and UA1 cone finder for charged particle jet reconstruction using the ALICE detector at midrapidity in proton-proton collisions at the LHC. We will examine the transverse momentum dependence of the charged particle jet production cross section, and various jet properties such as charged particle multiplicity, and jet shape. Results will be compared with available model predictions. These studies will form the baseline for similar measurements in the more complex environment of A+A collisions.
  31. ============================
    E-mail: edwin-norbeck@uiowa.edu
    Name: Edwin Norbeck
    Institution: University of Iowa
    Address: Dept. of Physics and Astronomy University of Iowa Iowa City, IA 52242
    Title: Measuring scattered beam at the LHC
    Abstract: Measurement of the energy loss and scattering angle of both beam particles (in a colliding beam machine) provides a measurement of the total energy and vector momentum of the reaction products. This also allows the determination of missing energy and momentum (not just transverse momentum). The measurements are made in the tunnel hundreds of meters from the interaction region. The beam magnets act as a giant spectrometer. What is measured is the distance of the particle from the main beam and the angle it makes with respect to the beam direction. With protons the cross sections are small so that measurements must be made with dozens of interactions in each beam crossing. A measurement of the arrival time of the two protons to within 10 ps provides a connection of the measured proton pair to the correct interaction. With Pb ions the cross sections are large and the beam currents are small, but no detailed studies have been made of the feasibility of studies of the scattered Pb ions.
  32. ============================
    E-mail: salur@physics.rutgers.edu
    Name: Sevil Salur

    Institution: Rutgers University
    Address: The State University of New Jersey, Department of Physics & Astronomy, 136 Frelinghuysen Rd, Piscataway, NJ 08854
    Title: Dijet imbalance in 2.76 TeV PbPb collisions in CMS
    Abstract: TBA.
  33. ============================
    E-mail: lyan@ic.sunysb.edu
    Name: Li Yan
    Institution: Stony Brook University
    Address: 12 Fargo Court Coram, NY, 11727
    Title: Anisotropic flow and viscous hydrodynamcis
    Abstract: Anisotropic flow, v_1, v_2, v_3 etc., can be interpreted as the medium response to initial state anisotropy in Heavy-ion Collisions. Since relativistic hydrodynamics, especially when viscous corrections are included, has been established as the description for medium evolution, we investigate complete 2nd order viscous hydrodynamics, and study the viscous effect on anisotropic flow. With the help of conformal symmetry, in our analysis, the only input parameter is shear viscosity entrapy ratio, \eta/s. As a result, viscous effect on anisotropic flow put a constraint on the valus of \eta/s, and play a key role the theoretical predication for experiments.
  34. ============================ Email: akesich@ucdavis.edu
    Name: Anthony Kesich
    Institution: University of California at Davis
    Address: One Shields Ave. Davis, CA 95616
    Title: Measurements of Upsilon Production and Nuclear Modification Factor at STAR
    Abstract: TBA
  35. ============================
    Email: goto@bnl.gov
    Name: Yuji Goto
    Institution: RIKEN
    Address: 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
    Title: Single transverse-spin asymmetry of very forward neutron production in polarized pp collisions at PHENIX
    Abstract: Inclusive cross section and single transverse-spin asymmetry of very forward neutron production were measured at PHENIX. The neutron cross section is explained by one pion exchange model. The observed large asymmetry of neutron production is considered to come from the interference between the spin-flip amplitude of the pion exchange and spin-non-flip amplitude of all Reggeon exchange. Therefore, the neutron asymmetry should have a sensitivity to other Reggeon exchange amplitude even if it is a small amplitude.
  36. ============================
    E-mail: eric.appelt@gmail.com
    Name: Eric Appelt
    Institution: Vanderbilt University
    Address: 6301 Stevenson Center, VU Station B #351807, Nashville, TN 37235
    Title: Azimuthal anisotropy in charged hadron production in 2.76 TeV PbPb collisions measured by CMS
    Abstract: We report on the CMS measurements of charged hadron anisotropic azimuthal distributions from PbPb collisions at sqrt(s_NN) = 2.76 TeV and their decomposition into a Fourier series up to the 6th coefficient. The results are presented as a function of transverse momentum, centrality and pseudorapidity and cover a broad kinematic range. These results can provide constraints on the theoretical description of the early dynamics in the hot and dense medium and its transport properties.
  37. ============================
    E mail: rolandg@mit.edu
    Name: Gunther Roland
    Institution: MIT
    Address: MIT Rm 24-514 77 Mass Ave Cambridge, MA 02139 USA
    Title: Studies of high pT isolated photon and charged hadron production in PbPb collisions with CMS
    Abstract: In this talk, we will present CMS results on isolated photon and charged hadron production in PbPb collisions at LHC. The PbPb data will be compared to measurements in pp collisions to obtain the nuclear modification factors as a function of centrality and transverse momentum, reaching up to 100GeV/c for charged hadrons. We will also discuss the prospects for photon-jet correlations using the isolated photon sample.
  38. ==============================
    Email: tlusty@gmail.com
    Name: David Tlusty
    Institution: NPI ASCR
    Address: Na Truhlarce 39/64 180 86 Praha 8 Czech Republic
    Title: Open heavy flavor in STAR
    Abstract: Heavy quarks are a unique probe to study the medium produced in ultra-relativistic heavy ion collisions. The dominant process of charm quark production at RHIC is believed to be initial gluon fusion which can be calculated in the perturbative QCD. The upper limit of FONLL calculation seems to be in good agreement with charm cross section measurements at mid-rapidity in $p+p$ collisions at $\sqrt{s_{NN}} = 200 GeV provided by STAR. The same measurement in Au+Au collisions at equal energy reveals the number-of-binary-collisions scaling of charm cross section indicating that charm production is dominated by initial hard scatterings. This talk will present the measurements of $D^{0}$, $D^{*}$ in $p+p$ and $D^0$ in Au+Au collisions at 0.6 GeV/$c < p_T < 6$ GeV/$c$ via hadronic decays $D^{0}\rightarrow K^-\pi^+,\ D^{*+}\rightarrow D^0\pi^+\rightarrow K^-\pi^+\pi^+$ and Non-photonic electrons spectra at 3 GeV/$c < p_T < 10$ GeV/$c$ reconstruction in $\sqrt{s_{NN}}=200$ GeV $p+p$ collisions at mid-rapidity $|y|<1$.
  39. ===============================
    Email: cubreto@cern.ch
    Name: Guillermo Breto Rangel
    Institution: UC Davis
    Address: 299 Laussat St San Francisco CA 94117
    Title: Quarkonia production in 2.76 TeV PbPb collisions in CMS
    Abstract: The Compact Muon Solenoid (CMS) is fully equipped to measure hard probes in the di-muon decay channel in the high multiplicity environment of nucleus-nucleus collisions. Such probes are especially relevant for studying the quark-gluon plasma since they are produced at early times and propagate through the medium, mapping its evolution. CMS has measured the nuclear modification factors of non-prompt J/psi (from b-hadron decays), prompt J/psi and Y(1S) in PbPb collisions at $\sqrt{s_{NN}} = 2.76$ TeV. Suppression of the excited Y-states has also been measured with respect to the Y(1S). Results from the 2010 data taking period are reported and an outlook on the 2011 data analysis will be given.
  40. ===============================
    Email: desilva@uh.edu
    Name: L. Chanaka De Silva
    Institution: University of Houston
    Address: L. C. De Silva Graduate Research Assistant University of Houston, Physics Department 617 Science & Research Building 1 Houston, TX 77204
    Title: "Delta_eta and Delta_phi correlations with respect to the ridge as seen in STAR"
    Abstract: TBA
  41. ===============================
    E-mail: takao @bnl.gov
    Name: Takao Sakaguchi
    Institution: Brookhaven National Laboratory
    Address: Brookhaven National Laboratory Physics Department Bldg 510, Upton, NY 11973
    Title: Direct Photons: Flow, Thermal Yield and High pT R_AA.
  42. ===============================
    E- mail: jonatan.piedra.gomez@cern.ch
    Name: Jónatan Piedra
    Institution: Universidad de Oviedo
    Address: CERN postbox E19710
    Title: Higgs searches in CMS
    Abstract: Thanks to an excellent performance, in 2011 the LHC has delivered a total integrated luminosity of ~5 fb-1. With this data the CMS experiment has narrowed the search for the Standard Model Higgs boson to a mass window of just ~16 GeV. Here we summarize the latest SM and BSM Higgs searches conducted by the CMS experiment, based on the 2011 data. Future Higgs searches during the 8 TeV run will be also discussed.
  43. ==============================
    Email: salur@physics.rutgers.edu
    Name: Sevil Salur
    Institution: Rutgers University
    Address: The State University of New Jersey, Department of Physics & Astronomy, 136 Frelinghuysen Rd, Piscataway, NJ 08854
    Title: Dijet imbalance in 2.76 TeV PbPb collisions in CMS
    Abstract: In this talk we present the measurement of dijet production in PbPb collisions at a nucleon-nucleon center-of-mass energy of 2.76 TeV that is studied with the CMS detector at the LHC. We use data corresponding to an integrated luminosity of 150 μb−1. Jets are reconstructed using the anti-kT algorithm on particle flow objects. The dijet momentum balance and angular correlations are studied as a function of collision centrality and leading jet momentum. For the most peripheral PbPb collisions, good agreement of the dijet momentum balance distributions with pp data and reference calculations at the same collision energy is found. However, more central collisions show a strong imbalance of leading and subleading jet transverse momenta, confirming the previous observations made using a smaller dataset. The extended jet transverse momentum range significantly increases the discriminatory power of the measurement for different models of parton energy loss in hot QCD mat
    ter.
  44. ==============================
    Email: mtonjes@umd.edu
    Name: Marguerite Tonjes
    Institution: University of Maryland
    Address: Department of Chemistry & Biochemistry University of Maryland College Park MD 20742
    Title: Jet fragmentation functions in 2.76 TeV pp and PbPb collisions in CMS
    Abstract: The energy loss of partons in high-energy nuclear collisions is one of the most interesting observables to probe the nature of the medium produced in relativistic heavy ion collisions. Analyzing data from PbPb and pp collisions at a center-of-mass energy of 2.76 TeV, recorded with the Compact Muon Solenoid (CMS) detector, parton energy loss is observed as a significant imbalance of dijet transverse momentum. To gain further understanding of the parton energy loss mechanism as mainfested in the distribution of high-pT final state particles, the hard component of the fragmentation function is studied for leading and subleading jets in bins of dijet imbalance.
  45. ==============================
    Email: dmcglinchey@fsu.edu
    Name: Darren McGlinchey
    Institution: Florida State University
    Address: Department of Physics Florida State University 77 Chieftain Way Tallahassee FL 32306-4350 USA
    Title: Cold Nuclear Matter Effects on J/psi Production from PHENIX
    Abstract: Understanding the effects of a nuclear target on J/psi production, often termed cold nuclear matter effects, is critical to understanding the J/psi production mechanism as well as interpreting the results of J/psi production in heavy ion collisions. The J/psi production in d+Au collisions at sqrt(s_{NN})=200 GeV has been measured by PHENIX, covering a large range of rapidity, transverse momentum, and collision centrality. These results will be discussed, as well as their implications for understanding both the J/psi production mechanism and the measured results in heavy ion collisons.
  46. ======================
    Email: schrnbrg@purdue.edu
    Name: Rolf Scharenberg
    Institution: Purdue University, Address: 525 Northwestern Ave
    West Lafayette IN. 47907
    Title:Clustering of Color Sources and the EOS of QGP in Relativistic Heavy Ion Collisions from RHIC to LHC.
  47. ========================
    E mail: paul.w.stankus@gmail.com
    Name: Paul Stankus
    Institution: Oak Ridge National Lab
    Address: 671 High St Port Jefferson, NY 11777
    Title: Latest Flow Results from PHENIX
    Abstract: TBA
  48. =================
    Email: bauer@pa.msu.edu
    Name: Wolfgang Bauer
    Institution: Michigan State University
    Address:
    Title: TBA
    Abstract: TBA
  49. ==================
    Email: bellwied@uh.edu
    Name: Rene Bellwied
    Institution: University of Houston
    Address: University of Houston Physics Department 617 SR 1 Building Houston, TX 77204
    Title: Theoretical and experimental evidence for hadron formation above the QCD critical temperature.
    Abstract: Recent work on in-medium hadronization in the non-equilibrated fragmentation process has been followed up by studies on bound state formation in the equilibrated deconfined matter as described by lattice QCD. Through the comparison to PNJL model calculations we find evidence for an extended phase of mixed degrees of freedom. The extracted hadron formation probability exhibits flavor and baryon number dependencies which are experimentally verifiable. We confront the calculations of the non-equilibrium and equilibrium particle production in heavy ion collisions with measurements from RHIC and LHC.
  50. ==================
    Email: westfall@nscl.msu.edu
    Name: Gary Westfall
    Institution: Michigan State University
    Address:
    Title: TBA
    Abstract: TBA
  51. =====================
    Email: oli.hajkova@gmail.com
    Name: Olga Hajkova
    Institution: Czech Technical University in Prague
    Address: Zrzaveho 12 Prague 6 16300 Czech Republic
    Title: J/Psi measurements at STAR
    Abstract: During the last decade STAR experiment has studied the hot and dense nuclear matter produced in heavy ion collisions at RHIC. The study of quarkonium, such as J/Psi meson, production provides the information about properties of this nuclear matter. It is predicted that due to the Debye screening the quarkonia production is suppressed when Quark Gluon Plasma (QGP) is present. In order to understand the properties of hot and dense nuclear matter, it is necessary to study the production of quarkonia in hadron-hadron, hadron-ion, and ion-ion collisions separately to distinguish cold nuclear matter effect, such as gluon shadowing, from the suppression due to the formation of QGP. Moreover, the J/Psi - hadron azimuthal correlations allow to extract the fraction of J/Psi that originates from B-mesons. This talk will present recent J/Psi measurements at mid-rapidity in p+p, Au+Au, and d+Au collisions at $\sqrt{s_{NN}}=200$ GeV at STAR, the fraction of J/Psi originates from
    B-mesons, and J/Psi eliptic flow v2...
  52. =======================
    Email: danielewicz@nscl.msu.edu
    Name: Pawel Danielewicz
    Institution: NSCL/Cyclotron Lab, Michigan State U
    Address: NSCL/Cyclotron Laboratory Michigan State University 640 South Shaw Lane, Rm. 223 East Lansing, Michigan 48824-1321 USA
    Title: Symmetry Energy from Nuclear Excitation Spectra
    Abstract: Extraction of the symmetry energy from systematic of excitation energies to isobaric analog states (IAS) of ground states is discussed. Understanding of the symmetry energy is essential when extrapolating from finite nuclei to neutron matter. At different densities, the symmetry energy is explored within nuclear structure and heavy-ion reactions. The IAS systematic allows for an independent assessment of the magnitude and slope of the symmetry energy with density, for uniform matter. In the course of carrying through the assessment, new analytic criteria for stability of systems described by phenomenological Skyrme interactions are derived. Close to 40\% of Skyrme parameterizations proposed in the literature turn out to produce unstable systems, even when employing only time-even terms within calculations.
  53. ====================
    Email: tafirout@triumf.ca
    Name: Reda Tafirout
    Institution: TRIUMF
    Address: 4004 Wesbrook Mall Vancouver, BC, V6T 2A3
    Title: Status of the ATLAS Higgs Search
    Abstract: We present the current status and latest results on Higgs searches from the ATLAS experiment. The dataset corresponds to an integrated luminosity of up to 4.9 fb-1 of pp collisions collected at a center-of-mass energy of 7 TeV at the LHC. The three most sensitive decay channels in the mass range considered are gamma gamma, ZZ and WW. We will also discuss prospects for 2012 LHC running at 8 TeV.
  54. ====================
    E mail: xpzhangnju@gmail.com
    Name: Xiaoping Zhang
    Institution: Tsinghua University
    Address: Rm 802, LiuQing Building, Department of Engineering Physics, Tsinghua University, Beijing 100084, China
    Title: Probe the partonic/hadronic matter with elliptic flow in STAR Beam Energy Scan program
    Abstract: TBA
  55. ======================
    Email: kkaude2@uic.edu
    Name: Kolja Kauder
    Institution: University of Illinois at Chicago
    Address: Dept. of Physics, Room 2218 845 W Taylor St, M/C 273 Chicago, IL-60607
    Title: Trigger-PID dependence of the "ridge", the jet- cone, and the away-side in di-hadron correlations in STAR
    Abstract: TBA
  56. ======================
    E mail: kehw@bnl.gov
    Name: Hongwei Ke
    Institution: Central China Normal University and Brookhaven National Lab
    Address: Brookhaven National Laboratory, Physics Dept, Bldg 510A Upton, NY 11973
    Title: Charge Asymmetry Dependency of pi+/pi- elliptic flow in Au + Au Collisions at $\sqrt{s_{NN}}$ = 200 GeV
    Abstract: A recent theoretical research indicates that a chiral magnetic wave at finite baryon density could induce the electric quadrupole moment of the quark-gluon plasma produced in heavy ion collisions. The quadrupole deformation will lead to difference in elliptic flow, i.e. v2, between positive and negative pions, and the magnitude of such difference is predicted to be proportional to net charge asymmetry. Studies on baryon number transportation also provide possible explanation of the order of pi+/pi- elliptic flow. In this talk, we present STAR's measurement of v2 difference between positive charged pions and negative charged pions at low transverse momentum, for Au+Au collisions at $\sqrt{s_{NN}}$ = 200 GeV. The result will be shown as a function of net charge asymmetry and centrality. Comparison to model calculations will be made. The implication to theoretical predictions will be discussed.
  57. ======================
    E mail: sean@physics.wayne.edu
    Name: Sean Gavin
    Institution: Wayne State University
    Title: Fluctuation Probes of Early-Time Correlations in Nuclear Collisions
    Abstract: Correlation measurements imply that anisotropic flow in nuclear collisions includes a novel triangular component along with the more familiar elliptic-flow contribution. Triangular flow has been attributed to event-wise fluctuations in the initial shape of the collision volume. We ask two questions: 1) How do these shape fluctuations impact other event-by-event observables? 2) Can we disentangle fundamental information on the early time fluctuations from the complex flow that results? We study correlation and fluctuation observables in a framework in which flux tubes in an early Glasma stage later produce hydrodynamic flow. Calculated multiplicity and transverse momentum fluctuations are in excellent agreement with data from 62.4 GeV Au+Au up to 2.76 TeV Pb+Pb.
  58. ======================
    E mail: john.harris@yale.edu
    Name: John Harris
    Institution: Yale University
    Title: TBA
    Abstract: TBA
  59. ======================
    E mail: claude.pruneau@wayne.edu
    Name: Claude Pruneau
    Institution: Wayne State University
    Title: TBA
    Abstract: TBA
  60. =======================
    E mail: Norbert.Novitzky@cern.ch
    Name: Norbert Novitzky
    Institution: University of Jyvaskyla
    Address: P.O. Box 35 (YFL) FI-40014 University of Jyväskylä, Finland
    Title: Energy Scan of Hadron Suppression and Flow in AuAu Collisions at PHENIX
  61. ===========
    Eemail: dvp@bnl.gov
    Name: Dennis V. Perepelitsa
    Institution: Columbia University
    Address: 538 West 120th Street Pupin Hall Box 94 New York, NY 10027
    Title: Reconstructed Jet Results in p+p, d+Au and Cu+Cu collisions at 200 GeV from PHENIX
    Abstract: Jet reconstruction in heavy ion collisions at RHIC and the LHC is becoming a popular tool to explore medium effects including the energy loss and modified fragmentation of hard-scattered partons. In p+A collisions, reconstructed jets are important for evaluating cold nuclear matter effects such as the impact parameter dependence of nuclear parton distribution functions and initial state energy loss. We present current PHENIX results from p+p, d+Au and Cu+Cu collisions at 200 GeV using the Gaussian filter and anti-kT algorithms. Ongoing direct jet reconstruction efforts at PHENIX in a variety of collision systems will help to tell a coherent story of jet physics at RHIC.
  62. ===================
    Name: Justin Frantz
    Institution: Ohio University
    Title: Hadron and Direct Photon - Jet Correlations in PHENIX/RHIC
    Abstract: The energy loss of highly energetic quarks and gluons traversing the hot plasma are an important probe of heavy ion collisions at RHIC and the LHC. Direct photon-hadron correlations from photon-jet pairs are an important complement to the more usual di-jet studies of energy loss
    and modification, since the direct photon escapes the medium without strong interaction. I will present the latest results of PHENIX Direct Photon-Jet correlations including the status of a new set of analyses probing the charge asymmetry expected in the quark-jet preference of the dominant Compton process for direct photon correlations in heavy ion collisions. Additionally I will offer some insights on the 2-particle correlation results in general.
  63. ======================
    Name: Scott Pratt
    Institution: Michigan State University
    Address: Dept. of Physics and Astronomy Michigan State University East Lansing, MI 48824
    Title: Generalized Charge Balance Functions: Insight into the Chemistry of the QGP abstract: The most fundamental property of the QGP, that quarks are good quasi particles, has eluded robust experimental discovery. We will show how correlations induced from charge conservation as a function of relative rapidity can quantitatively determine detailed features of the quark chemical evolution in high-energy heavy-ion collisions.
  64. =======================
    Name: Ivan Vitev
    Institution: Los Alamos National Laboratory
    Title: High transverse momentum quarkonium production and dissociation in heavy ion collisions
    Abstract: We calculate the yields of quarkonia in heavy ion collisions at RHIC and the LHC as a function of the transverse momentum. Based upon heavy quark effective theory, our results include both color-singlet and color-octet contributions and feed-down effects from excited states. In reactions with ultra-relativistic nuclei, we focus on the consistent implementation of dynamically calculated nuclear matter effects, such as coherent power corrections, cold nuclear matter energy loss and the Cronin effect, in the initial state and collisional dissociation of quarkonia in the final state, as they traverse through the QGP. Theoretical results are presented for J/psi and Upsilon and compared to experimental data where applicable. At RHIC, a good description of the high-pT J/psi modification observed in central Cu+Cu and Au+Au collisions can be achieved within the model uncertainties. We find that J/psi measurements in proton nucleus reactions are needed to constrain the magnitude of cold nuclear matter effects. At the LHC, a good description of the experimental data can be achieved only in mid-central and peripheral Pb+Pb collisions. The large five-fold suppression of prompt J/psi in the most central nuclear reactions may indicate for the first time possible thermal effects at the level of the quarkonium wavefunction at large transverse momentum.