The sigma meson production in p ＋ ^12C and p A- ^40Ca reactions at the incident energy Ep = 1.5 GeV is investigated within the Quantum Molecular Dynamics model. The simulation results indicate a distinctive A depende...The sigma meson production in p ＋ ^12C and p A- ^40Ca reactions at the incident energy Ep = 1.5 GeV is investigated within the Quantum Molecular Dynamics model. The simulation results indicate a distinctive A dependence of the sigma production, that is, the increase of A is followed by an increase of the production cross sections. We find that the σ meson production in proton-induced reactions is strongly medium-dependent, and the produced σ mesons decaying in a denser medium experience a stronger mass shift towards lower masses. This mass shift is an experimentally accessible observable in the final state pion pairs, which do not suffer from reabsorption by the surrounding nucleons. It is pointed out that the ratio of measured sigma cross sections as a function of the sigma invariant-mass from various reactions is a good probe to explore the existence of the σ meson in a dense nuclear environment.展开更多
Jet quenching has been proposed as a probe of the properties of the strongly interacting quarkgluon-plasma in high energy heavy ion collisions.At the meantime,it is also important to study the excitation of medium by ...Jet quenching has been proposed as a probe of the properties of the strongly interacting quarkgluon-plasma in high energy heavy ion collisions.At the meantime,it is also important to study the excitation of medium by propagating jets.Based on Boltzmann equation,a Monte Carlo was constructed to simulate the elastic collisions with thermal partons by energetic jets.Medium modification due to jet-medium interaction has been studied within this model in a uniform medium.展开更多
Medium modifications ofγ-triggered jets are investigated with the linear Boltzmann transport model in heavy-ion collisions with varying system sizes,focusing on centrality dependence in Pb+Pb and Xe+Xe collisions at ...Medium modifications ofγ-triggered jets are investigated with the linear Boltzmann transport model in heavy-ion collisions with varying system sizes,focusing on centrality dependence in Pb+Pb and Xe+Xe collisions at the LHC.Our numerical results reveal that jets produced in central collisions exhibit a wider transverse asymmetry(A_(N)^(γ))distribution,broader jet shape,and more pronouncedγ-jet transverse momentum imbalance(X_(Jγ)=P_(T)^(jet)/P_(T)^(γ))compared with peripheral collisions.These effects arise from the longer path length and stronger jet-medium interactions in central collisions,leading to enhanced jet quenching and medium response.Our findings demonstrate that the magnitude ofγ-jet modifications is sensitive to the size and centrality of the collision system,with larger systems inducing more significant alterations owing to increased energy loss and medium feedback.展开更多
基金National Natural Science Foundation of China under Grant Nos.10435080,10575075,and 10447006the Deutsche Forschungsgemeinschaft under Grant No.446CHV-113/91/1-3the National Research Concil of Thailand under Grant No.1.CH5/2549
文摘The sigma meson production in p ＋ ^12C and p A- ^40Ca reactions at the incident energy Ep = 1.5 GeV is investigated within the Quantum Molecular Dynamics model. The simulation results indicate a distinctive A dependence of the sigma production, that is, the increase of A is followed by an increase of the production cross sections. We find that the σ meson production in proton-induced reactions is strongly medium-dependent, and the produced σ mesons decaying in a denser medium experience a stronger mass shift towards lower masses. This mass shift is an experimentally accessible observable in the final state pion pairs, which do not suffer from reabsorption by the surrounding nucleons. It is pointed out that the ratio of measured sigma cross sections as a function of the sigma invariant-mass from various reactions is a good probe to explore the existence of the σ meson in a dense nuclear environment.
基金Supported by National Natural Science Foundation of China (10975059)
文摘Jet quenching has been proposed as a probe of the properties of the strongly interacting quarkgluon-plasma in high energy heavy ion collisions.At the meantime,it is also important to study the excitation of medium by propagating jets.Based on Boltzmann equation,a Monte Carlo was constructed to simulate the elastic collisions with thermal partons by energetic jets.Medium modification due to jet-medium interaction has been studied within this model in a uniform medium.
基金National Natural Science Foundation of China(11935007)Guangdong Basic and Applied Basic Research Foundation(2021A1515110817)+1 种基金Guangdong Major Project of Basic and Applied Basic Research(2020B0301030008)Science and Technology Program of Guangzhou(2019050001)。
文摘Medium modifications ofγ-triggered jets are investigated with the linear Boltzmann transport model in heavy-ion collisions with varying system sizes,focusing on centrality dependence in Pb+Pb and Xe+Xe collisions at the LHC.Our numerical results reveal that jets produced in central collisions exhibit a wider transverse asymmetry(A_(N)^(γ))distribution,broader jet shape,and more pronouncedγ-jet transverse momentum imbalance(X_(Jγ)=P_(T)^(jet)/P_(T)^(γ))compared with peripheral collisions.These effects arise from the longer path length and stronger jet-medium interactions in central collisions,leading to enhanced jet quenching and medium response.Our findings demonstrate that the magnitude ofγ-jet modifications is sensitive to the size and centrality of the collision system,with larger systems inducing more significant alterations owing to increased energy loss and medium feedback.
