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Search Results: 1 - 10 of 401279 matches for " M. Gyulassy "
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Correlations for Mass-Shifted Bosons
T. Csorgo,M. Gyulassy
Physics , 1999,
Abstract: We discuss a new kind of correlation, the correlation of particle-antiparticle pairs emitted back-to-back in the local rest frame of a medium, if medium effects cause mass modification of the quanta. The theory of these new correlations is summarized for relativistically expanding, locally thermalized sources.
Energy Systematics of Jet Tomography
A. Adil,M. Gyulassy
Physics , 2005, DOI: 10.1556/APH.27.2006.2-3.3
Abstract: The collision energy dependence of jet tomography is investigated within the GLV formalism. We estimate systematic uncertainties resulting from the interplay of energy loss fluctuations and the rapid increase of the parton transverse momentum slopes as $\sqrt{s}$ decreases from 200 to 62.4 AGeV.
3D Jet Tomography of Twisted Strongly Coupled Quark Gluon Plasmas
A. Adil,M. Gyulassy
Physics , 2005, DOI: 10.1103/PhysRevC.72.034907
Abstract: The triangular enhancement of the rapidity distribution of hadrons produced in p+A reactions relative to p+p is a leading order in A^{1/3}/log(s) violation of longitudinal boost invariance at high energies. In A+A reactions this leads to a trapezoidal enhancement of the local rapidity density of produced gluons. The local rapidity gradient is proportional to the local participant number asymmetry, and leads to an effective rotation in the reaction plane. We propose that three dimensional jet tomography, correlating the long range rapidity and azimuthal dependences of the nuclear modification factor, R_{AA}(\eta,\phi,p_\perp; b>0), can be used to look for this intrinsic longitudinal boost violating structure of $A+A$ collisions to image the produced twisted strongly coupled quark gluon plasma (sQGP). In addition to dipole and elliptic azimuthal moments of R_{AA}, a significant high p_\perp octupole moment is predicted away from midrapidity. The azimuthal angles of maximal opacity and hence minima of R_{AA} are rotated away from the normal to the reaction plane by an `Octupole Twist' angle, \theta_3(\eta), at forward rapidities.
Anomalous Anti-proton to Negative Pion Ratio as Revealed by Jet Quenching at RHIC
I. Vitev,M. Gyulassy
Physics , 2001, DOI: 10.1063/1.1469986
Abstract: We study the apparent discrepancy between the standard PQCD predictions for the meson and baryon ratios and multiplicities at moderate high $p_{T} > 2$ GeV and recent experimental measurements in $Au+Au$ collisions at $\sqrt{s}_{NN}=130$ GeV at the Relativistic Heavy Ion Collider (RHIC). We show that the differences, most pronounced in central collisions, can be explained by a strong non-perturbative baryon Junction component, which dominates the currently accessible experimental $p_{T}$ window and the non-abelian energy loss of fast partons propagating through hot and dense medium. The recently introduced two component hybrid model, which combines a quenched jet PQCD calculation in the Gyulassy-Levai-Vitev (GLV) formalism and a phenomenological "soft" part, is further elaborated to take into account the full 3D expansion in the pre-hadronization phase and include particle flavor dependent "soft" inverse slopes as suggested by the baryon Junction picture. We show that such approach can resolve what seems to be a factor of $\simeq 2$ difference in the moderate high $p_{T}$ suppression of $\pi^0$ and $h^-$ as recently reported by the PHENIX collaboration. The observed quenching of the high $p_{T}$ particle spectra and the large $\bar{p}/\pi^-$ and $p/\pi^+$ ratios as a function of $p_{T}$ are found to be consistent with a creation of a deconfined phase and non-abelian energy loss of fast partons in a plasma of initial gluon rapidity density $dN^g/dy \sim 1000$.
Testing AdS/CFT Drag and pQCD Heavy Quark Energy Loss
W. A. Horowitz,M. Gyulassy
Physics , 2008, DOI: 10.1088/0954-3899/35/10/104152
Abstract: We present charm and bottom nuclear modification factors for RHIC and LHC using Standard Model perturbative QCD and recent AdS/CFT string drag energy loss models. We find that extreme extrapolations to LHC mask potential experimentally determinable differences in the individual $R_{AA}$s but that their ratio, $R_{AA}^c/R_{AA}^b$ as a function of transverse momentum is a remarkably robust observable for finding deviations from either theoretical framework.
Testing AdS/CFT Deviations from pQCD Heavy Quark Energy Loss with Pb+Pb at LHC
W. A. Horowitz,M. Gyulassy
Physics , 2007, DOI: 10.1016/j.physletb.2008.04.065
Abstract: Heavy quark jet quenching in nuclear collisions at LHC is predicted and compared using the classical gravity AdS/CFT correspondence and Standard Model perturbative QCD. The momentum independence and inverse quark mass dependence of the drag coefficient in AdS/CFT differs substantially from the characteristic log(pT/M)/pT variation of the drag in QCD. We propose that the measurement of the momentum dependence of the double ratio of the nuclear modification factors of charm and bottom jets is a robust observable that can be used to search for strong coupling deviations from perturbative QCD predictions.
Squeezed Correlations and Spectra for Mass-Shifted Bosons
M. Asakawa,T. Csorgo,M. Gyulassy
Physics , 1998, DOI: 10.1103/PhysRevLett.83.4013
Abstract: Huge back-to-back correlations are shown to arise for thermal ensembles of bosonic states with medium-modified masses. The effect is experimentally observable in high energy heavy ion collisions.
Back-to-Back Correlations for Bosons Modified by Medium
M. Asakawa,T. Csorgo,M. Gyulassy
Physics , 1999, DOI: 10.1016/S0375-9474(99)85056-8
Abstract: Novel back-to-back correlations are shown to arise for thermal ensembles of squeezed bosonic states associated with medium-modified mass-shifts. The strength of these correlations could become unexpectedly large in heavy ion collisions.
Transverse Shocks in the Turbulent Gluon Plasma Produced in Ultra-Relativistic A+A
M. Gyulassy,D. H. Rischke,B. Zhang
Physics , 1996,
Abstract: Mini-jet production in ultra-relativistic nuclear collisions leads to initial conditions characterized by large fluctuations of the local energy density (hot spots) and of the collective flow field (turbulence). Assuming that local equilibrium is reached on a small time scale, $\sim 0.5$ fm/c, the transverse evolution of those initial conditions is computed using hydrodynamics. We find that a new class of collective flow phenomena (hadronic volcanoes) could arise under such conditions. This could be observable via enhanced azimuthal fluctuations of the transverse energy flow, $d^2E_\perp/d\phi dy$.
Soft Open Charm Production in Heavy-Ion Collisions
V. Topor Pop,J. Barrette,M. Gyulassy
Physics , 2009, DOI: 10.1103/PhysRevLett.102.232302
Abstract: Effects of strong longitudinal color electric fields (SCF) on the open charm production in nucleus-nucleus (A + A) collisions at 200A GeV are investigated within the framework of the HIJING-BBbar v2.0 model. A three fold increase of the effective string tension due to in medium effects in A + A collisions, results in a sizeable (60-70 percents) enhancement of the total charm production cross sections. The nuclear modification factors show a suppression at moderate transverse momentum consistent with RHIC data. At Large Hadron Collider energies the model predicts an increase of total charm production cross sections by approximately an order of magnitude.
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