Abstract
Jet-medium interaction involves two important effects: jet energy loss and medium response. The search for jet-induced medium excitations is one of the hot topics in jet quenching study in relativistic nuclear collisions. In this work, we perform a systematic study on how the lost energy from hard jets evolves with the bulk medium and redistributes in the final state of heavy-ion collisions via a multi-phase transport model. In particular, the (Delta eta , Delta phi ) distribution of charged particles with respect to the jet axis and jet shape function are studied for various Pb + Pb collision centralities and for different transverse momentum intervals of charged particles. Our numerical result shows a strong enhancement of soft particles at large angles for Pb + Pb collisions relative to p + p collisions at the LHC, qualitatively consistent with recent CMS data. This indicates that a significant fraction of the lost energy from hard jets is carried by soft particles at large angles away from the jet axis.
Highlights
One important a e-mail: guangyou.qin@mail.ccnu.edu.cn b e-mail: wangek@scnu.edu.cn c e-mail: zhanghz@mail.ccnu.edu.cn evidence of jet quenching is the suppression of large transverse momentum hadrons produced in heavy-ion collisions [15,16,17], which has been observed at Relativistic Heavy Ion Collider (RHIC) and the Large Hadron Collider (LHC)
The stacked histograms are results from the a multi-phase transport (AMPT) model: different colors represent the contributions from different pT intervals for charged particles
The stacked histograms are obtained from the AMPT model: different colors represent the contributions from different pT intervals for charged particles
Summary
Another important aspect of jet-medium interaction is the medium response to jet propagation [27,28,29,30,31]. Reconstructed jets and their nuclear modification provide many new insights into the study of jet energy loss and medium response in relativistic heavy-ion collisions. To further investigate where the lost energy redistributes in the final state, one may study the detailed distributions of final-state particles with different momenta around the reconstructed jets up to very large angles away from the jet axis. The ( η, φ) distribution of charged particle yield and jet shape ρ( r ) have been measured for different Pb + Pb collision centralities and for different transverse momentum intervals of charged particles Such differential measurements provide a unique opportunity for studying the redistribution of the lost energy from hard jets due to jetmedium interaction.
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