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Title: {phi} and {omega} production in relativistic heavy-ion collisions in a dynamical quark coalescence model

Abstract

Based on the phase-space information obtained from a multiphase transport model within the string-melting scenario for strange and antistrange quarks, we study the yields and transverse-momentum spectra of {phi} mesons and {omega} ({omega}{sup -}+{omega}{sup +}) baryons and their anisotropic flows in Au + Au collisions at RHIC using a dynamical quark coalescence model that includes the effect from quark phase-space distributions inside hadrons. With current quark masses and fixing the {phi} and {omega} radii from fitting measured yields, we first study the ratio of the yield of {omega} baryons to that of {phi} mesons as well as their elliptic and fourth-order flows as functions of their transverse momentum. How the elliptic and fourth-order flows of {phi} mesons and {omega} baryons are related to those of strange and antistrange quarks is then examined. The dependence of these results on {phi} and {omega} radii as well as on the strange quark mass is also studied.

Authors:
 [1];  [2];  [3]
+ Show Author Affiliations
  1. Institute of Theoretical Physics, Shanghai Jiao Tong University, Shanghai 200240 (China)
  2. (China)
  3. Cyclotron Institute and Physics Department, Texas A and M University, College Station, Texas 77843-3366 (United States)
Publication Date:
OSTI Identifier:
20771469
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. C, Nuclear Physics; Journal Volume: 73; Journal Issue: 4; Other Information: DOI: 10.1103/PhysRevC.73.044903; (c) 2006 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; ANISOTROPY; BROOKHAVEN RHIC; COALESCENCE; DISTRIBUTION; GOLD 197 REACTIONS; GOLD 197 TARGET; NUCLEAR REACTION YIELD; OMEGA BARYONS; PARTICLE RADII; PHASE SPACE; PHI-1020 MESONS; PHI-1680 MESONS; RELATIVISTIC RANGE; S QUARKS; TRANSPORT THEORY; TRANSVERSE MOMENTUM

Citation Formats

Chen Liewen, Center of Theoretical Nuclear Physics, National Laboratory of Heavy Ion Accelerator, Lanzhou 730000, and Ko Cheming. {phi} and {omega} production in relativistic heavy-ion collisions in a dynamical quark coalescence model. United States: N. p., 2006. Web. doi:10.1103/PhysRevC.73.044903.
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Chen Liewen, Center of Theoretical Nuclear Physics, National Laboratory of Heavy Ion Accelerator, Lanzhou 730000, & Ko Cheming. {phi} and {omega} production in relativistic heavy-ion collisions in a dynamical quark coalescence model. United States. doi:10.1103/PhysRevC.73.044903.
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Chen Liewen, Center of Theoretical Nuclear Physics, National Laboratory of Heavy Ion Accelerator, Lanzhou 730000, and Ko Cheming. Sat . "{phi} and {omega} production in relativistic heavy-ion collisions in a dynamical quark coalescence model". United States. doi:10.1103/PhysRevC.73.044903.
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@article{osti_20771469,
title = {{phi} and {omega} production in relativistic heavy-ion collisions in a dynamical quark coalescence model},
author = {Chen Liewen and Center of Theoretical Nuclear Physics, National Laboratory of Heavy Ion Accelerator, Lanzhou 730000 and Ko Cheming},
abstractNote = {Based on the phase-space information obtained from a multiphase transport model within the string-melting scenario for strange and antistrange quarks, we study the yields and transverse-momentum spectra of {phi} mesons and {omega} ({omega}{sup -}+{omega}{sup +}) baryons and their anisotropic flows in Au + Au collisions at RHIC using a dynamical quark coalescence model that includes the effect from quark phase-space distributions inside hadrons. With current quark masses and fixing the {phi} and {omega} radii from fitting measured yields, we first study the ratio of the yield of {omega} baryons to that of {phi} mesons as well as their elliptic and fourth-order flows as functions of their transverse momentum. How the elliptic and fourth-order flows of {phi} mesons and {omega} baryons are related to those of strange and antistrange quarks is then examined. The dependence of these results on {phi} and {omega} radii as well as on the strange quark mass is also studied.},
doi = {10.1103/PhysRevC.73.044903},
journal = {Physical Review. C, Nuclear Physics},
number = 4,
volume = 73,
place = {United States},
year = {Sat Apr 15 00:00:00 EDT 2006},
month = {Sat Apr 15 00:00:00 EDT 2006}
}
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Journal Article:
DOI:  10.1103/PhysRevC.73.044903
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  • ; ; - AIP Conference Proceedings
    We report the results on the transverse momentum spectra of {phi} mesons and {omega} ({omega}- + {omega}(bar sign)+) baryons as well as their anisotropic flows in Au+Au collisions at RHIC, obtained from a dynamical quark coalescence model that uses the quark phase-space information from a multi-phase transport (AMPT) model within the string melting scenario and includes the quark structure of hadrons.

  • ; ; ; ... - Physical Review. C, Nuclear Physics
    The hadron production in relativistic heavy ion collisions is well described by the quark combination model. The mixed ratios for various hadrons and the transverse momentum spectra for long-life hadrons are predicted and agree with recent Relativistic Heavy Ion Collider data. The production rates for the pentaquarks {theta}{sup +} and {theta}{sup *++} and the di-baryon ({omega}{omega}){sub 0{sup +}} are estimated, neglecting the effect from the transition amplitude for constituent quarks to form an exotic state.

  • ; - Physical Review, C
    A quark model of kaon coalescence is developed which involves annihilation of the nonstrange quark pair in the process of forming a {phi} particle. Comparison is made with data on {phi} production with Si + Au collisions at the alternating-gradient synchrotron. {copyright} {ital 1996 The American Physical Society.}

  • ; ; ; ... - Phys. Rev. C
    We present results for the measurement of {phi} meson production via its charged kaon decay channel {phi} {yields} K{sup +}K{sup -} in Au+Au collisions at {radical}S{sub NN} = 62.4, 130, and 200 GeV, and in p+p and d+Au collisions at {radical}s{sub NN} = 200 GeV from the STAR experiment at the BNL Relativistic Heavy Ion Collider (RHIC). The midrapidity (|y| < 0.5) {phi} meson transverse momentum (p{sub T}) spectra in central Au+Au collisions are found to be well described by a single exponential distribution. On the other hand, the p{sub T} spectra from p+p, d+Au, and peripheral Au+Au collisions showmore » power-law tails at intermediate and high p{sub T} and are described better by Levy distributions. The constant {phi}/K{sup -} yield ratio vs beam species, collision centrality, and colliding energy is in contradiction with expectations from models having kaon coalescence as the dominant mechanism for {phi} production at RHIC. The {Omega}/{phi} yield ratio as a function of p{sub T} 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 transverse momenta. The measured nuclear modification factor, R{sub dAu}, for the {phi} meson increases above unity at intermediate p{sub T}, similar to that for pions and protons, while R{sub AA} is suppressed due to the energy loss effect in central Au+Au collisions. Number of constituent quark scaling of both R{sub cp} and v{sub 2} for the {phi} meson with respect to other hadrons in Au+Au collisions at {radical}s{sub NN} = 200 GeV at intermediate p{sub T} is observed. These observations support quark coalescence as being the dominant mechanism of hadronization in the intermediate p{sub T} region at RHIC.« less

  • ; ; ; ... - Physical Review. C, Nuclear Physics
    We present results for the measurement of {phi} meson production via its charged kaon decay channel {phi}{yields}K{sup +}K{sup -} in Au+Au collisions at {radical}(s{sub NN})=62.4,130, and 200 GeV, and in p+p and d+Au collisions at {radical}(s{sub NN})=200 GeV from the STAR experiment at the BNL Relativistic Heavy Ion Collider (RHIC). The midrapidity (|y|<0.5) {phi} meson transverse momentum (p{sub T}) spectra in central Au+Au collisions are found to be well described by a single exponential distribution. On the other hand, the p{sub T} spectra from p+p, d+Au, and peripheral Au+Au collisions show power-law tails at intermediate and high p{sub T} andmore » are described better by Levy distributions. The constant {phi}/K{sup -} yield ratio vs beam species, collision centrality, and colliding energy is in contradiction with expectations from models having kaon coalescence as the dominant mechanism for {phi} production at RHIC. The {omega}/{phi} yield ratio as a function of p{sub T} 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 transverse momenta. The measured nuclear modification factor, R{sub dAu}, for the {phi} meson increases above unity at intermediate p{sub T}, similar to that for pions and protons, while R{sub AA} is suppressed due to the energy loss effect in central Au+Au collisions. Number of constituent quark scaling of both R{sub cp} and v{sub 2} for the {phi} meson with respect to other hadrons in Au+Au collisions at {radical}(s{sub NN})=200 GeV at intermediate p{sub T} is observed. These observations support quark coalescence as being the dominant mechanism of hadronization in the intermediate p{sub T} region at RHIC.« less