Kaon and Lambda Production at Intermediate p_T: Insights into the\n Hadronization of the Bulk Partonic Matter Created in Au+Au Collisions at RHIC

2003/09/03 by P. Sørensen, Paul Richard Sorensen, Sorensen, Paul Richard
Mathematics · Physics and Astronomy · #Baryon #FOS: Physical sciences #Hadron #Hadronization #High Energy Physics - Experiment (hep-ex) #High-Energy Particle Collisions Research #Hyperon #Lambda #Lambda baryon #Meson #Nuclear Experiment (nucl-ex) #Nuclear physics #Particle physics #Particle physics theoretical and experimental studies #Physics #Production (economics) #Quantum Chromodynamics and Particle Interactions #Quark–gluon plasma #Stochastic processes and statistical mechanics #Theoretical and Computational Physics #hep-ex #nucl-ex

paper · pdf · doi:10.48550/arxiv.nucl-ex/0309003

Ph.D. Thesis, 126 pages, Updated references, corrected typos, removed some preliminary results

openalex publication_date 2003/09/03 · arxiv created 2003/09/09 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/06

Abstract

Measurements of identified particles over a broad p_T range may provide\nstrong evidence for the existence of a thermalized partonic state in heavy-ion\ncollisions (\i.e. a quark-gluon plasma). Of particular interest are the\ncentrality dependence and the azimuthal anisotropy in the yield of baryons and\nmesons at intermediate p_T. The first measurements of v₂ and the\nnumber-of-binary-collisions scaled centrality ratio R_CP for K_S⁰ and\n\Λ+\\Λ production in Au+Au collisions at RHIC are presented.\nThese measurements from the STAR detector establish the particle-type\ndependence of v₂ and R_CP within 0.4 < p_T < 6.0. At intermediate\np_T (1.5--4.5 GeV/c) v₂ of K_S⁰ and \Λ+\\Λ is shown to\nfollow a number-of-constituent-quark scaling with v₂^kaon(p_T/2)/2 =\nv₂^lambda(p_T/3)/3. R_CP shows that lambda production at intermediate\np_T increases more rapidly with system size than kaon production: consistent\nwith multi-parton dynamics in particle production. At p_T = 5.5 GeV/c lambda,\nkaon, and charged hadron production are suppressed by a similar factor (R_CP\n\≈ 0.33): establishing the extent of the centrality dependent baryon\nenhancement. The particle- and p_T-dependence of v₂, and R_CP are\nconsistent with expectations based on hadronization of bulk partonic matter by\ncoalescence. As such, the constituent-quark-number scaled v₂ may reflect the\nanisotropy established in a partonic stage providing strong evidence for the\nexistence of a quark-gluon plasma in Au+Au collisions at RHIC.\n

Citations

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Related

• Onset of Constituent Quark Number Scaling in Heavy-Ion Collisions at RHIC
• Salient Features of Hadronization, Deconfinement and Heavy Quark Probes at RHIC
• Measurements of identified particles at intermediate transverse momentum in the STAR experiment from Au+Au collisions at sqrts_NN=200 GeV
• Identified particle production at high transverse momentum in nucleus-nucleus collisions at RHIC
• Probing QCD matter via K^*0(892) and ϕ(1020) resonance production at RHIC