Bulletin of the American Physical Society
2011 Fall Meeting of the APS Division of Nuclear Physics
Volume 56, Number 12
Wednesday–Saturday, October 26–29, 2011; East Lansing, Michigan
Session 2WC: Workshop on the Energy Frontier, Heavy Ions at the LHC II |
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Chair: S. Pratt, Michigan State University Room: 105AB |
Wednesday, October 26, 2011 10:30AM - 11:00AM |
2WC.00001: First Results from the CMS Heavy Ion Program Invited Speaker: Julia Velkovska We will present an overview of the CMS results from PbPb collisions at $\sqrt{s_{NN}}$ = 2.76 TeV, probing quark-gluon matter at unprecedented energy density. The CMS apparatus provides calorimetry, muon and tracking systems covering a large range in pseudorapidity, complemented by a flexible two-level trigger system. This allows for the study of the production of jets, photons, charged hadrons, quarkonia and vector bosons at large transverse momenta as a function of collision centrality. Results from the rare probe signals, alongside with measurements of particle correlations and collective flow over a broad kinematic range, would provide the means to characterize the properties of the produced medium. [Preview Abstract] |
Wednesday, October 26, 2011 11:00AM - 11:30AM |
2WC.00002: Theoretical interpretation of new jet results from the LHC Invited Speaker: Ivan Vitev Jets physics in heavy ion reactions is an important new area of active research at Relativistic Heavy Ion Collider and at the Large Hadron Collider that paves the way for novel tests of QCD dynamics in dense nuclear matter. Recently, first results on the quenching of leading particles and jets from the LHC lead-lead run at a center-of-mass energy of 2.76 TeV per nucleon-nucleon pair became available. With this motivation, we present a theoretical analysis of the exciting new experimental findings. We emphasize the accuracy that can be achieved in next-to-leading order perturbative calculations and focus on the suppression the single and double inclusive jet cross sections. We demonstrate how the di-jet asymmetry, recently measured by ATLAS and CMS, can be related to these general results. The case of jets tagged by an electroweak boson is exemplified by the $Z_0$+jet channel. We discuss the constraints that the inclusive $Z_0$ measurements by CMS place on cold nuclear matter effects at the LHC. Finally, we clarify the relation between the suppression of inclusive jets, tagged jets and di-jets and the quenching of inclusive particles on the example of the recent ALICE and CMS hadron attenuation data. We conclude by discussing the insights in the in-medium modification of parton showers that the new LHC data provide and point to future directions and effective theories of QCD that can help improve the accuracy of the tools for jet tomography. [Preview Abstract] |
Wednesday, October 26, 2011 11:30AM - 12:00PM |
2WC.00003: Flow at the LHC from event-by-event viscous hydrodynamics Invited Speaker: Bjoern Schenke I review recent developments in describing anisotropic flow at the LHC with a relativistic 3+1 dimensional viscous event-by-event hydrodynamic simulation. I present results for elliptic and triangular flow and the comparison to first experimental data. Furthermore, I discuss the potential of the systematic study of higher harmonics and directed flow to pin down the shear viscosity to entropy density ratio of the created quark gluon plasma and the details of the initial state. [Preview Abstract] |
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