Abstract
Azimuthal particle correlations have been extensively studied in the past at various collider energies in p-p, p-A, and A-A collisions. Hadron-correlation measurements in heavy- ion collisions have mainly focused on studies of collective (flow) effects at low-pT and parton energy loss via jet quenching in the high-pT regime. This was usually done without event-byevent particle identification. In this paper, we present two-particle correlations with identified trigger hadrons and identified associated hadrons at mid-rapidity in Monte Carlo generated events. The primary purpose of this study was to investigate the effect of quantum number conservation and the flavour balance during parton fragmentation and hadronization. The simulated p-p events were generated with PYTHIA 6.4 with the Perugia-0 tune = 7 TeV. HIJING was used to generate 0 - 10% central Pb-Pb events at = 2.76 TeV. We found that the extracted identified associated hadron spectra for charged pion, kaon, and proton show identified trigger-hadron dependent splitting. Moreover, the identified trigger-hadron dependent correlation functions vary in different pT bins, which may show the presence of collective/nuclear effects.
Highlights
Charged hadron-hadron correlations have been extensively studied since the ISR and SppS experiments in the mid ’70’s [1]
All charged final-state particles were kept for analysis from the Monte Carlo events, the trigger particles and associated particles used for the two-particle correlations measurements were limited in pseudorapidity
Further investigation was needed to look deeper into the validity of the quantum number conservations of correlated particle pairs
Summary
Charged hadron-hadron correlations have been extensively studied since the ISR and SppS experiments in the mid ’70’s [1]. Well before jet reconstruction methods were born, these correlation measurements have been applied more recently in relativistic heavy-ion collisions where full jet reconstruction is challenging, especially at low jet energies The focus of these studies was to investigate medium effects such as back-to-back jet suppression and modifications of the fragmentation process. The question of quantum number conservation during the phase transition from the partonic to the hadronic world can be addressed only through correlations beyond the simple baryon-to-meson ratios In this short review we investigate the strength of the expected effects revealed by PID-triggered hadron-hadron correlations in high-energy p-p and Pb-Pb collisions at LHC energies in the mid-rapidity region (|η| < 1). This region represents the sensitive geometrical areas of the RHIC/LHC detectors, that are common to STAR, PHENIX, ALICE, ATLAS and CMS
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