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Title: Production of strange particles at intermediate p{sub T} in central Au+Au collisions at high energies

Abstract

The recombination model is applied to the production of K,{phi},{lambda} , and {omega} at all p{sub T} in central Au+Au collisions. The thermal-shower component of the recombination is found to be important for K and {lambda}, but only in a minor way for {phi} and {omega} in the intermediate to high p{sub T} region. The normalization and inverse slope of the thermal partons in the strange sector are determined by fitting the low-p{sub T} data. At higher p{sub T} the data of K,{lambda},{phi}, and {omega} in the log scale are all well reproduced in our study that extends the thermal contribution and includes the shower contribution. The calculated result on the {lambda}/K ratio rises to a maximum of around 2 at p{sub T}{approx_equal}4 GeV/c, arching over the data in linear scale. The production of {phi} and {omega} are shown to arise mainly from the recombination of thermal partons, thus exhibiting exponential p{sub T} dependences in agreement with the data. Their ratio, R{sub {omega}}{sub /{phi}}, rises linearly to p{sub T}{approx_equal}4 GeV/c and develops a maximum at p{sub T}{approx_equal}5.5 GeV/c. It is argued that the p{sub T} spectra of {phi} and {omega} reveal directly the partonic nature of the thermal source thatmore » characterizes quark-gluon plasma. Comments are made on the {omega} puzzle due to the simultaneous observation of both the exponential behavior of the {omega} spectrum in p{sub T} and the existence of low-p{sub T} particles associated with {omega} as trigger.« less

Authors:
 [1];  [1];  [2]
  1. Institute of Theoretical Science and Department of Physics, University of Oregon, Eugene, Oregon 97403-5203 (United States)
  2. (China)
Publication Date:
OSTI Identifier:
20995308
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.75.054904; (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; GEV RANGE 01-10; GOLD 197 REACTIONS; GOLD 197 TARGET; MASS NUMBER; OMEGA BARYONS; PARTICLE PRODUCTION; QUARK MATTER; RECOMBINATION; SPECTRA

Citation Formats

Hwa, Rudolph C., Yang, C. B., and Institute of Particle Physics, Hua-Zhong Normal University, Wuhan 430079. Production of strange particles at intermediate p{sub T} in central Au+Au collisions at high energies. United States: N. p., 2007. Web. doi:10.1103/PHYSREVC.75.054904.
Hwa, Rudolph C., Yang, C. B., & Institute of Particle Physics, Hua-Zhong Normal University, Wuhan 430079. Production of strange particles at intermediate p{sub T} in central Au+Au collisions at high energies. United States. doi:10.1103/PHYSREVC.75.054904.
Hwa, Rudolph C., Yang, C. B., and Institute of Particle Physics, Hua-Zhong Normal University, Wuhan 430079. Tue . "Production of strange particles at intermediate p{sub T} in central Au+Au collisions at high energies". United States. doi:10.1103/PHYSREVC.75.054904.
@article{osti_20995308,
title = {Production of strange particles at intermediate p{sub T} in central Au+Au collisions at high energies},
author = {Hwa, Rudolph C. and Yang, C. B. and Institute of Particle Physics, Hua-Zhong Normal University, Wuhan 430079},
abstractNote = {The recombination model is applied to the production of K,{phi},{lambda} , and {omega} at all p{sub T} in central Au+Au collisions. The thermal-shower component of the recombination is found to be important for K and {lambda}, but only in a minor way for {phi} and {omega} in the intermediate to high p{sub T} region. The normalization and inverse slope of the thermal partons in the strange sector are determined by fitting the low-p{sub T} data. At higher p{sub T} the data of K,{lambda},{phi}, and {omega} in the log scale are all well reproduced in our study that extends the thermal contribution and includes the shower contribution. The calculated result on the {lambda}/K ratio rises to a maximum of around 2 at p{sub T}{approx_equal}4 GeV/c, arching over the data in linear scale. The production of {phi} and {omega} are shown to arise mainly from the recombination of thermal partons, thus exhibiting exponential p{sub T} dependences in agreement with the data. Their ratio, R{sub {omega}}{sub /{phi}}, rises linearly to p{sub T}{approx_equal}4 GeV/c and develops a maximum at p{sub T}{approx_equal}5.5 GeV/c. It is argued that the p{sub T} spectra of {phi} and {omega} reveal directly the partonic nature of the thermal source that characterizes quark-gluon plasma. Comments are made on the {omega} puzzle due to the simultaneous observation of both the exponential behavior of the {omega} spectrum in p{sub T} and the existence of low-p{sub T} particles associated with {omega} as trigger.},
doi = {10.1103/PHYSREVC.75.054904},
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}
}