2,548 research outputs found

    Effect of hard processes on momentum correlations

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    The effect of hard processes to be encountered in HBT studies at the Large Hadron Collider have been studied. A simple simulation has allowed us to generate momentum correlations involving jet particles as well as particles originating from the kinetic freeze out and to compare them to a simple theoretical model which has been developed. The first results on the effect of hard processes on the correlation function for the case of jet quenching are presented.Comment: 9 pages, 12 figures, talk presented at 2nd Warsaw Meeting on Particle Correlations and Resonances in Heavy Ion Collision

    Transverse Momentum Correlations in Relativistic Nuclear Collisions

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    From the correlation structure of transverse momentum ptp_t in relativistic nuclear collisions we observe for the first time temperature/velocity structure resulting from low-Q2Q^2 partons. Our novel analysis technique does not invoke an {\em a priori} jet hypothesis. ptp_t autocorrelations derived from the scale dependence of fluctuations reveal a complex parton dissipation process in RHIC heavy ion collisions. We also observe structure which may result from collective bulk-medium recoil in response to parton stopping.Comment: 10 pages, 10 figures, proceedings, MIT workshop on fluctuations and correlations in relativistic nuclear collision

    Detecting many-body entanglements in noninteracting ultracold atomic fermi gases

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    We explore the possibility of detecting many-body entanglement using time-of-flight (TOF) momentum correlations in ultracold atomic fermi gases. In analogy to the vacuum correlations responsible for Bekenstein-Hawking black hole entropy, a partitioned atomic gas will exhibit particle-hole correlations responsible for entanglement entropy. The signature of these momentum correlations might be detected by a sensitive TOF type experiment.Comment: 5 pages, 5 figures, fixed axes labels on figs. 3 and 5, added reference

    Transverse momentum correlations of quarks in recursive jet models

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    In the symmetric string fragmentation recipe adopted by PYTHIA for jet simulations, the transverse momenta of successive quarks are uncorrelated. This is a simplification but has no theoretical reason. Transverse momentum correlations are naturally expected, for instance, in a covariant multiperipheral model of quark hadronization. We propose a simple recipe of string fragmentation which lead to such correlations. The definition of the jet axis and its relation with the primordial transverse momentum of the quark is also discussed.Comment: 7 pages, 3 figures, 1 tabl

    Estimation of shear viscosity based on transverse momentum correlations

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    Event anisotropy measurements at RHIC suggest the strongly interacting matter created in heavy ion collisions flows with very little shear viscosity. Precise determination of "shear viscosity-to-entropy" ratio is currently a subject of extensive study. We present preliminary results of measurements of the evolution of transverse momentum correlation function with collision centrality of Au+AuAu +Au interactions at sNN\sqrt{s_{NN}} = 200 GeV. We compare two differential correlation functions, namely {\it inclusive} and a differential version of the correlation measure C~\tilde C introduced by Gavin et.al.{\it et. al.}. These observables can be used for the experimental study of the shear viscosity per unit entropy.Comment: 4 pages, 8 figures, proceedings re-submitted for Quark Matter 2009 conference. This paper contains revision of one of the figure
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