Testing of coalescence mechanism in high energy heavy ion collisions using two-particle correlations with identified particle trigger

Abstract

In central Au-Au collisions at top RHIC energy, two particle correlation measurements with identified hadron trigger have shown attenuation of near side proton triggered jet-like yield at intermediate transverse momentum ($p{}_T$), 2$<p{}_T<$ 6 GeV/$c$. The attenuation has been attributed to the anomalous baryon enhancement observed in the single inclusive measurements at the same $p{}_T$ range. The enhancement has been found to be in agreement with the models invoking coalescence of quarks as a mechanism of hadronization. Baryon enhancement has also been observed at LHC in the single inclusive spectra. We study the consequence of such an enhancement on two particle correlations at LHC energy within the framework of A Multi Phase Transport (AMPT) model that implements quark coalescence as a mode of hadronization. In this paper we have calculated the proton over pion ratio and the near side per trigger yield associated to pion and proton triggers at intermediate $p{}_T$ from String Melting (SM) version of AMPT. Results obtained are contrasted with the AMPT Default (Def.) which does not include coalescence. Baryon enhancement has been observed in AMPT SM at intermediate $p{}_T$. Near side jet-like correlated yield associated to baryon (proton) trigger in the momentum region where baryon generation is enhanced is found to be suppressed as compared to the corresponding yields for the meson (pion) trigger in most central Pb-Pb events. No such effect has been found in the Default version of AMPT.

arXiv comment6 pages, 6 figures

References in corpus (33)

• A Multi-Phase Transport Model for Relativistic Heavy Ion Collisions
• Identified Charged Particle Spectra and Yields in Au+Au Collisions at sqrt(s_NN) = 200 GeV
• Flow at the SPS and RHIC as a Quark Gluon Plasma Signature
• Hadronization in heavy ion collisions: Recombination and fragmentation of partons
• Disappearance of back-to-back high $p_T$ hadron correlations in central Au+Au collisions at $\sqrt{s_{NN}}$ = 200 GeV
• Parton coalescence and antiproton/pion anomaly at RHIC
• Centrality dependence of $\pi$, K, p production in Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 2.76 TeV
• Hadron production in heavy ion collisions: Fragmentation and recombination from a dense parton phase
• Formation of superdense hadronic matter in high energy heavy-ion collisions
• Distributions of Charged Hadrons Associated with High Transverse Momentum Particles in pp and Au+Au Collisions at sqrt(s_NN)=200 GeV
• ZPC 1.0.1: a parton cascade for ultrarelativistic heavy ion collisions
• Enhanced production of direct photons in Au+Au collisions at sqrt(s_NN)=200 GeV and implications for the initial temperature
• Lattice Results on QCD Thermodynamics
• Scaling properties of azimuthal anisotropy in Au+Au and Cu+Cu collisions at sqrt(s_NN) = 200 GeV
• Partonic effects on the elliptic flow at relativistic heavy ion collisions
• Dynamics of Hot Bulk QCD Matter: from the Quark-Gluon Plasma to Hadronic Freeze-Out
• Anisotropic flow
• Centrality dependence of the pseudorapidity density distribution for charged particles in Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 2.76 TeV
• Measurement of Direct Photons in pp and Pb-Pb Collisions with ALICE
• Pb-Pb collisions at $\sqrt{s_{NN}}=2.76$ TeV in a multiphase transport model
• Particle-yield modification in jet-like azimuthal di-hadron correlations in Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 2.76 TeV
• Mass ordering of differential elliptic flow and its violation for phi mesons
• Recombination of shower partons in fragmentation processes
• Jet hadrochemistry as a characteristics of jet quenching
• Jet Structure of Baryon Excess in Au+Au Collisions at sqrt(s_NN) = 200 GeV
• Di-hadron azimuthal correlation and Mach-like cone structure in parton/hadron transport model
• Correlated Emission of Hadrons from Recombination of Correlated Partons
• Suppression of high transverse momenta hadrons in Pb+Pb collisions at LHC
• Azimuthal Anisotropy: Ridges, Recombination and Breaking of Quark Number Scaling
• (medium-modified) Fragmentation Functions
• Global Properties of Nucleus-Nucleus Collisions
• Di-Hadron Correlations with Identified Leading Hadrons in 200 GeV Au+Au and d+Au Collisions at STAR
• High $p_T$ Inclusive Charged Hadron Spectra from Au+Au Collisions at $\sqrt{s_{NN}}$ = 200 GeV