skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Conical flow due to partonic jets in central Au+Au collisions

Abstract

In jet quenching, a hard QCD parton, before fragmenting into a jet of hadrons, deposits a fraction of its energy in the medium, leading to suppressed production of high-p{sub T} hadrons. The process can generate shock waves. We study the distortion of Mach shock waves due to jet quenching in central Au+Au collisions and its effect on particle production. Finite fluid velocity and inhomogeneity of the medium can distort the Mach shock front significantly such that the inside shock front disappear and the outside shock front is opened up. We also show that the STAR data on azimuthal distribution of background subtracted secondaries, associated with high p{sub T} trigger, are reasonably well explained by the excess pions produced due to partonic energy loss.

Authors:
 [1]
  1. Variable Energy Cyclotron Centre, 1-AF, Bidhan Nagar, Kolkata-700064 (India)
Publication Date:
OSTI Identifier:
20995351
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. C, Nuclear Physics; Journal Volume: 75; Journal Issue: 5; Other Information: DOI: 10.1103/PhysRevC.75.057902; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; COLLISIONS; ENERGY LOSSES; GOLD 197 REACTIONS; GOLD 197 TARGET; JETS; PARTICLE PRODUCTION; PIONS; QUANTUM CHROMODYNAMICS; QUENCHING; SHOCK WAVES

Citation Formats

Chaudhuri, A. K. Conical flow due to partonic jets in central Au+Au collisions. United States: N. p., 2007. Web. doi:10.1103/PHYSREVC.75.057902.
Chaudhuri, A. K. Conical flow due to partonic jets in central Au+Au collisions. United States. doi:10.1103/PHYSREVC.75.057902.
Chaudhuri, A. K. Tue . "Conical flow due to partonic jets in central Au+Au collisions". United States. doi:10.1103/PHYSREVC.75.057902.
@article{osti_20995351,
title = {Conical flow due to partonic jets in central Au+Au collisions},
author = {Chaudhuri, A. K.},
abstractNote = {In jet quenching, a hard QCD parton, before fragmenting into a jet of hadrons, deposits a fraction of its energy in the medium, leading to suppressed production of high-p{sub T} hadrons. The process can generate shock waves. We study the distortion of Mach shock waves due to jet quenching in central Au+Au collisions and its effect on particle production. Finite fluid velocity and inhomogeneity of the medium can distort the Mach shock front significantly such that the inside shock front disappear and the outside shock front is opened up. We also show that the STAR data on azimuthal distribution of background subtracted secondaries, associated with high p{sub T} trigger, are reasonably well explained by the excess pions produced due to partonic energy loss.},
doi = {10.1103/PHYSREVC.75.057902},
journal = {Physical Review. C, Nuclear Physics},
number = 5,
volume = 75,
place = {United States},
year = {Tue May 15 00:00:00 EDT 2007},
month = {Tue May 15 00:00:00 EDT 2007}
}
  • We present first measurements of the {phi}-meson elliptic flow (v{sub 2}(p{sub T})) and high-statistics p{sub T} distributions for different centralities from {radical}s{sub NN} = 200 GeV Au+Au collisions at RHIC. In minimum bias collisions the v{sub 2} of the {phi} meson is consistent with the trend observed for mesons. The ratio of the yields of the {Omega} to those of the {phi} as a function of transverse momentum is consistent with a model based on the recombination of thermal s quarks up to p{sub T} {approx} 4 GeV/c, but disagrees at higher momenta. The nuclear modification factor (R{sub CP}) ofmore » {phi} follows the trend observed in the K{sub S}{sup 0} mesons rather than in {Lambda} baryons, supporting baryon-meson scaling. These data are consistent with {phi} mesons in central Au+Au collisions being created via coalescence of thermalized s quarks and the formation of a hot and dense matter with partonic collectivity at RHIC.« less
  • We present first measurements of the {phi}-meson elliptic flow (v{sub 2}(p{sub T})) and high-statistics p{sub T} distributions for different centralities from {radical}(s{sub NN})=200 GeV Au+Au collisions at RHIC. In minimum bias collisions the v{sub 2} of the {phi} meson is consistent with the trend observed for mesons. The ratio of the yields of the {omega} to those of the {phi} as a function of transverse momentum is consistent with a model based on the recombination of thermal s quarks up to p{sub T}{approx}4 GeV/c, but disagrees at higher momenta. The nuclear modification factor (R{sub CP}) of {phi} follows the trendmore » observed in the K{sub S}{sup 0} mesons rather than in {lambda} baryons, supporting baryon-meson scaling. These data are consistent with {phi} mesons in central Au+Au collisions being created via coalescence of thermalized s quarks and the formation of a hot and dense matter with partonic collectivity at RHIC.« less
  • Azimuthal angle {Delta}{phi} correlations are presented for charged hadrons from dijets for 0.4 < p{sub T} < 10 GeV/c in Au+Au collisions at {radical}(s{sub NN}) = 200 GeV. With increasing p{sub T}, the away-side distribution evolves from a broad to a concave shape, then to a convex shape. Comparisons to p+p data suggest that the away-side can be divided into a partially suppressed 'head' region centered at {Delta}{phi} {approx} {pi}, and an enhanced 'shoulder' region centered at {Delta}{phi} {approx} {pi} {+-} 1.1. The p{sub T} spectrum for the 'head' region softens toward central collisions, consistent with the onset of jetmore » quenching. The spectral slope for the 'shoulder' region is independent of centrality and trigger p{sub T}, which offers constraints on energy transport mechanisms and suggests that the 'shoulder' region contains the medium response to energetic jets.« less
  • Azimuthal angle ({delta}{phi}) correlations are presented for charged hadrons from dijets for 0.4<p{sub T}<10 GeV/c in Au+Au collisions at {radical}(s{sub NN})=200 GeV. With increasing p{sub T}, the away-side distribution evolves from a broad and relatively flat shape to a concave shape, then to a convex shape. Comparisons to p+p data suggest that the away-side can be divided into a partially suppressed 'head' region centered at {delta}{phi}{approx}{pi} and an enhanced 'shoulder' region centered at {delta}{phi}{approx}{pi}{+-}1.1. The p{sub T} spectrum for the head region softens toward central collisions, consistent with the onset of jet quenching. The spectral slope for the shoulder regionmore » is independent of centrality and trigger p{sub T}, which offers constraints on energy transport mechanisms and suggests that it contains the medium response to energetic jets.« less