Quark Matter 2012

Session

Parallel 2A: Global & Collective Dynamics (Chair A. Poskanzer)

50

14 Aug 2012, 16:45

487. Measurement of elliptic and higher-order harmonics at 2.76 TeV Pb-Pb collisions with the ATLAS detector

Dominik Karol Derendarz (Polish Academy of Sciences (PL))

14/08/2012, 16:45

Oral Presentation

Anisotropy coefficients v_n are important observables for studying the hot, dense medium created in heavy ion collisions. They not only probe the collective flow of the bulk medium (at pT<3-4 GeV), but also probe the path-length dependent energy loss (at higher pT), both are associated with the asymmetries in the initial geometry. However, auto-correlations not related to initial geometry,...

66. Shear viscosity of the quark-gluon plasma from flow in heavy-ion collisions

Matthew Luzum (IPhT Saclay)

14/08/2012, 17:05

Global and collective dynamics

Oral Presentation

We report an extraction of the ratio of shear viscosity to entropy density (eta/s) of the medium created in relativistic heavy-ion collisions at the LHC. With a significant improvement of one of the main sources of theoretical uncertainty, we are able for the first time to quote a precise average value with robust error bars, systematically accounting for all known sources of systematic error...

400. Pseudorapidity density of charged particles in a wide pseudorapidity range and its centrality dependence in Pb-Pb collisions at 2.76 TeV

Maxime Rene Joseph Guilbaud (Universite Claude Bernard-Lyon I (FR))

14/08/2012, 17:25

Oral Presentation

In this talk we present a measurement of the pseudorapidity distribution in the range −5 < eta < 5.25, for different centralities in Pb-Pb collisions at sqrt(s_NN) =2.76 TeV. This also allows us to estimate the total number of produced charged particles. The measurement is performed exploiting LHC satellite bunches, that is bunches captured in non-nominal RF buckets. These give rise to...

206. Pseudorapidity and centrality dependence of transverse energy flow in PbPb collisions at 2.76 TeV from CMS

Dr Magdalena Malek (University of Illinois at Chicago (US))

14/08/2012, 17:45

Global and collective dynamics

Oral Presentation

The transverse energy flow in PbPb collisions at 2.76 TeV nucleon-nucleon center-of-mass energy has been measured over a broad range of centrality for pseudorapidities between -5.2 and 5.2 using the CMS detector at the LHC. This analysis is based on 0.306/ub of data from 2010, with recently extended number (and range) of pseudorapidity and centrality bins. The transverse energy per unit of...

114. E-by-E MUSIC Afterburner

Sangyong Jeon (McGill University)

14/08/2012, 18:05

Global and collective dynamics

Oral Presentation

Hydrodynamic models enjoy much success in describing and predicting the bulk dynamics of relativistic heavy ion collisions. Recent studies have clearly shown that including initial and final fluctuations is essential for detailed study of the evolving QGP. So far, however, not many studies appeared which incorporate both fluctuations at the same time. Here we present our first results in...