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Title: Azimuth quadrupole component spectra on transverse rapidity y{sub t} for identified hadrons from Au-Au collisions at {radical}(s{sub NN})=200 GeV

Abstract

I present the first isolation of azimuth quadrupole components from published v{sub 2}(p{sub t}) data (called elliptic flow) as spectra on transverse rapidity y{sub t} for identified pions, kaons, and {lambda}'s/protons from minimum-bias Au-Au collisions at 200 GeV. The form of the spectra on y{sub t} indicates that the three hadron species are emitted from a common boosted source with boost {delta}y{sub t0}{approx}0.6. The quadrupole spectra have a Levy form similar to the soft component of the single-particle spectrum, but with significantly reduced ({approx}0.7 times) slope parameters T. Comparison of quadrupole spectra with single-particle spectra suggests that the quadrupole component comprises a small fraction (<5%) of the total hadron yield, contradicting the hydrodynamic picture of a thermalized, flowing bulk medium. The form of v{sub 2}(p{sub t}) is, within a constant factor, the product of p{sub t}{sup '} (p{sub t} in the boost frame) times the ratio of quadrupole spectrum to single-particle spectrum. That ratio in turn implies that above 0.5 GeV/c, the form of v{sub 2}(p{sub t}) is dominated by the hard component of the single-particle spectrum (interpreted as being due to minijets). It is therefore unlikely that the so-called constituent-quark scaling attributed to v{sub 2} is relevant to softmore » hadron production mechanisms (e.g., chemical freeze-out)« less

Authors:
 [1]
  1. CENPA 354290, University of Washington, Seattle, Washington 98195 (United States)
Publication Date:
OSTI Identifier:
21199455
Resource Type:
Journal Article
Journal Name:
Physical Review. C, Nuclear Physics
Additional Journal Information:
Journal Volume: 78; Journal Issue: 6; Other Information: DOI: 10.1103/PhysRevC.78.064908; (c) 2008 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0556-2813
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; ATOM-ATOM COLLISIONS; COLLISIONS; COMPARATIVE EVALUATIONS; EMISSION; FREEZING OUT; GEV RANGE 100-1000; GOLD; HARD COMPONENT; KAONS; PARTICLE PRODUCTION; PARTICLE RAPIDITY; PARTICLES; PIONS; PROTONS; QUADRUPOLES; QUARKS; SCALING; SOFT COMPONENT; SPECTRA

Citation Formats

Trainor, Thomas A. Azimuth quadrupole component spectra on transverse rapidity y{sub t} for identified hadrons from Au-Au collisions at {radical}(s{sub NN})=200 GeV. United States: N. p., 2008. Web. doi:10.1103/PHYSREVC.78.064908.
Trainor, Thomas A. Azimuth quadrupole component spectra on transverse rapidity y{sub t} for identified hadrons from Au-Au collisions at {radical}(s{sub NN})=200 GeV. United States. https://doi.org/10.1103/PHYSREVC.78.064908
Trainor, Thomas A. Mon . "Azimuth quadrupole component spectra on transverse rapidity y{sub t} for identified hadrons from Au-Au collisions at {radical}(s{sub NN})=200 GeV". United States. https://doi.org/10.1103/PHYSREVC.78.064908.
@article{osti_21199455,
title = {Azimuth quadrupole component spectra on transverse rapidity y{sub t} for identified hadrons from Au-Au collisions at {radical}(s{sub NN})=200 GeV},
author = {Trainor, Thomas A},
abstractNote = {I present the first isolation of azimuth quadrupole components from published v{sub 2}(p{sub t}) data (called elliptic flow) as spectra on transverse rapidity y{sub t} for identified pions, kaons, and {lambda}'s/protons from minimum-bias Au-Au collisions at 200 GeV. The form of the spectra on y{sub t} indicates that the three hadron species are emitted from a common boosted source with boost {delta}y{sub t0}{approx}0.6. The quadrupole spectra have a Levy form similar to the soft component of the single-particle spectrum, but with significantly reduced ({approx}0.7 times) slope parameters T. Comparison of quadrupole spectra with single-particle spectra suggests that the quadrupole component comprises a small fraction (<5%) of the total hadron yield, contradicting the hydrodynamic picture of a thermalized, flowing bulk medium. The form of v{sub 2}(p{sub t}) is, within a constant factor, the product of p{sub t}{sup '} (p{sub t} in the boost frame) times the ratio of quadrupole spectrum to single-particle spectrum. That ratio in turn implies that above 0.5 GeV/c, the form of v{sub 2}(p{sub t}) is dominated by the hard component of the single-particle spectrum (interpreted as being due to minijets). It is therefore unlikely that the so-called constituent-quark scaling attributed to v{sub 2} is relevant to soft hadron production mechanisms (e.g., chemical freeze-out)},
doi = {10.1103/PHYSREVC.78.064908},
url = {https://www.osti.gov/biblio/21199455}, journal = {Physical Review. C, Nuclear Physics},
issn = {0556-2813},
number = 6,
volume = 78,
place = {United States},
year = {2008},
month = {12}
}