Hadron Correlation in Jets on the Near and Away Sides of High-p_T Triggers in Heavy-ion Collisions

Abstract

Correlation between trigger and associated particles in jets produced on near and away sides of high-p_T triggers in heavy-ion collisions is studied. Hadronization of jets on both sides is treated by thermal-shower and shower-shower recombination. Energy loss of semihard and hard partons traversing the nuclear medium is parametrized in a way that renders good fit of the single-particle inclusive distributions at all centralities. The associated hadron distribution in the near-side jet can be determined showing weak dependence on system size because of trigger bias. The inverse slope increases with trigger momentum in agreement with data. The distribution of associated particle in the away-side jet is also studied with careful attention given to antitrigger bias that is due to the longer path length that the away-side jet recoiling against the trigger jet must propagate in the medium to reach the opposite side. Centrality dependence is taken into account after determining a realistic probability distribution of the dynamical path length of the parton trajectory within each class of centrality. For symmetric dijets with p_T^{trig}=p_T^{assoc}(away) it is shown that the per-trigger yield is dominated by tangential jets. The average parton momentum for the recoil jet is shown to be always larger than that of the trigger jet for fixed p_T^{trig} and centrality and for any measurable p_T^{assoc}(away). With the comprehensive treatment of dijet production described here it is possible to answer many questions regarding the behavior of partons in the medium under conditions that can be specified on measurable hadron momenta.

17 pages in RevTex including 32 figures

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Cited by in corpus (7)

• Review of Jet Measurements in Heavy Ion Collisions
• System size and energy dependence of near-side di-hadron correlations
• Scaling Behavior of the Azimuthal and Centrality Dependencies of Jet Production in Heavy-ion Collisions
• Centrality and Transverse Momentum Dependencies of Minijets and Hadrons in Au-Au Collisions
• Relationship Between the Azimuthal Dependencies of Nuclear Modification Factor and Ridge Yield
• Productions of Heavy Flavored Mesons in Relativistic Heavy Ion Collisions in the Recombination Model
• $\pi$-$J/\psi$ Correlation and Elliptic Flow Parameter $v_2$ of Charmed Mesons at RHIC Energy