2016/12/31 by Zhan Gao, Ao Luo, Guo-Liang Ma +3 · 11 citations
Physics and Astronomy · #Hadron #High-Energy Particle Collisions Research #Impact parameter #Inelastic collision #Large Hadron Collider #Nuclear physics #Particle physics #Particle physics theoretical and experimental studies #Physics #Quantum Chromodynamics and Particle Interactions #Quantum mechanics #Radiative transfer #Scattering #Transverse plane #hep-ph
paper · pdf · doi:10.1103/physrevc.97.044903
published in Physical Review C 97(4) (American Institute of Physics) · 11 pages, 7 figures
openalex created_date 2017/02/03 · openalex publication_date 2018/04/09 · arxiv created 2018/04/20 · arxiv updated 2018/04/23 · openalex updated_date 2026/08/05
The overall transverse momentum balance and the redistribution of the lost energy from hard jets for asymmetric dijet events in PbPb collisions at 2.76A TeV at the LHC is studied within a multiphase transport (AMPT) model. A detailed analysis is performed for the projected transverse momentum \ensuremath⟨p\phantom\rule-7pt0ex/T||\ensuremath⟩ contributed from the final charged hadrons carrying different transverse momenta and emitted from different angular directions. We find that the transverse momentum projection \ensuremath⟨p\phantom\rule-7pt0ex/T||\ensuremath⟩ in the leading jet direction is mainly contributed by hard hadrons (pT>8.0\phantom\rule0.28em0exGeV/c) in both peripheral and central PbPb collisions, while the opposite direction in central collisions is dominated by soft hadrons (pT=0.5--2.0\phantom\rule0.28em0exGeV/c). The study of in-cone and out-of-cone contributions to \ensuremath⟨p\phantom\rule-7pt0ex/T||\ensuremath⟩ shows that these soft hadrons are mostly emitted at large angles away from the dijet axis. Our AMPT calculation is in qualitative agreement with the CMS measurements and the primary mechanism for the energy transported to large angles in the AMPT model is the elastic scattering at the partonic stage. Future studies including also inelastic processes should be helpful in understanding the overestimation of the magnitudes of in-cone and out-of-cone imbalances from our AMPT calculations, and shed light on different roles played by radiative and collisional processes in the redistribution of the lost energy from hard jets.