Bulletin of the American Physical Society
APS April Meeting 2011
Volume 56, Number 4
Saturday–Tuesday, April 30–May 3 2011; Anaheim, California
Session C10: Mini-symposium on Early-Time and Long-Range Correlations in Relativistic Heavy Ion Collisions I |
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Sponsoring Units: DNP Chair: Prof. Roy Lacey, SUNY Stony Brook Room: Garden 1 |
Saturday, April 30, 2011 1:30PM - 2:06PM |
C10.00001: Correlations and the Dynamics of Heavy Ion Collisions Invited Speaker: I will discuss to which extend various particle correlations may provide information about the dynamics of heavy ion collisions and the properties of the matter created in such reactions. I will further review present correlation measurements and discuss their various physical interpretations. [Preview Abstract] |
Saturday, April 30, 2011 2:06PM - 2:18PM |
C10.00002: Centrality dependence of number and transverse momentum correlations in Au+Au collisions at $\sqrt{s_{NN}}$ = 200 GeV Monika Sharma Recent measurements at RHIC have revealed a ridge-like structure
in the triggered and untriggered two-particle correlations in
Au+Au collisions. A significant interest lies in studying diverse
correlation functions which provide better understanding and
sensitivity to various reaction mechanisms. In this work we
present charged dependent measurements of two-particle
number density, $R_{2}(\Delta\eta,\Delta\phi)$ correlation
function, transverse momentum $R_{2}^{\Delta p_{T_1} \Delta
p_{T_2}}(\Delta\eta,\Delta\phi)$ correlation function and a hybrid
observable ${\it C}(\Delta\eta,\Delta\phi)$, designed to provide
new and additional insight in the collision dynamics of Au + Au
interactions. These observables are constructed as a function of
collision centrality for particles in the range $|\eta|<1.0$ and
$0.2 |
Saturday, April 30, 2011 2:18PM - 2:30PM |
C10.00003: Glasma and the Ridge at LHC Sean Gavin, George Moschelli Nuclear collision experiments exhibit long-range rapidity correlations. Specifically, two-particle correlation measurements show a ridge-like enhancement at small relative azimuthal-angle that extends over a wide pseudorapidity range. Similar ridge structures are observed in correlations of particles associated with a jet trigger (the hard ridge) as well as correlations without a trigger (the soft ridge). We argue that these structures are introduced when particles formed in an early Glasma stage later manifest transverse flow. We present new predictions for the ridge in PbPb, at 2.76 TeV as well as pp at 7 TeV. We also discuss how these results may be interpreted in terms of triangularity v$_{3}$. [Preview Abstract] |
Saturday, April 30, 2011 2:30PM - 2:42PM |
C10.00004: Investigating nearside (NS) correlation structure in two particle number correlations at RHIC L. Chanaka De Silva 2D two particle number correlation measurements at RHIC have shown an eta elongated correlation at the NS in heavy ion collisions relative to p+p. A quantitative investigation of the NS structure as a function of momentum of the correlated particles will be shown for Cu+Cu and Au+Au 200GeV collisions. A smooth evolution of the NS structure properties is observed. We extract NS structure amplitude and angular widths via a fit model and compare our data to a theory based on CGC initial conditions and radial flow [1,2]. Agreement between data and theory will be discussed for different pT ranges. Finally we discuss other possible explanations behind the NS long range correlation, in particular fits with an extended Fourier decomposition for the NS structure [3]. We show the effect that the inclusion of the third moment (v3) has on the second moment (v2) and the overall quality of the fit.\\[4pt] [1] Gavin, McLerran and Moschelli: Phys.Rev.C79:051902,2009\\[0pt] [2] Moschelli and Gavin: Nucl.Phys.A836:43-58,2010\\[0pt] [3] Alver and Roland: Phys.Rev.C81:054905,2010 [Preview Abstract] |
Saturday, April 30, 2011 2:42PM - 2:54PM |
C10.00005: The effect of triangular flow in jet-medium interaction Chin-Hao Chen When jets pass through the hot dense QCD medium created in heavy ion collisions, some exotic structures are observed. There is enhancement of jet-associated particle yields in the $\eta$ direction along trigger jets, known as ``the ridge.'' Opposing jets show a double peak structure,referred to as the shoulder and head. One possible explanation for the ridge and shoulder is triangular flow, or $v_3$. We present the two particle $\Delta\eta$-$\Delta\phi$ correlations at PHENIX. We measure $v_3$, and include background modulation by $v_3$ when analyzing jet data. The effect of $v_3$ is to redistribute the excess associated particle yield of the ridge in the $\Delta\phi$ direction, not changing the fact that excess yield exists. We will show how $v_3$ affects unfolding the jet signal from the underlying event, with two different methods of normalizing the level of the background. [Preview Abstract] |
Saturday, April 30, 2011 2:54PM - 3:06PM |
C10.00006: The Rise and Fall of the Ridge Paul Sorensen Recent data from Au+Au collisions at RHIC show unexpectedly large near-angle correlations that broaden longitudinally with centrality. It's been shown that for both 62.4 GeV and 200 GeV collisions, the amplitude of this ridge-like correlation rises rapidly with centrality, reaches a maximum, and then falls in the most central collisions. In this talk we explain how the rise and fall of the ridge can be easily understood in a picture where final momentum-space correlations are driven by initial coordinate space density fluctuations. We devise a model based on $v_n$ fluctuations from participant eccentricity fluctuations and use multiplicity and $v_2$ measurements from ALICE to predict the amplitude of the ridge at the LHC. [Preview Abstract] |
Saturday, April 30, 2011 3:06PM - 3:18PM |
C10.00007: ABSTRACT WITHDRAWN |
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