We carry out a detailed study of medium modifications on Z^(0)/γ+hadron correlations as well as jet substructures in association with Z^(0)/γ in Pb+Pb collisions with √S_(NN)=5.02TeV at the LHC.We utilize the linea...We carry out a detailed study of medium modifications on Z^(0)/γ+hadron correlations as well as jet substructures in association with Z^(0)/γ in Pb+Pb collisions with √S_(NN)=5.02TeV at the LHC.We utilize the linear Boltzmann transport(LBT)model to simulate the jet-medium interactions and medium response,and an extended cluster hadronization model to investigate the nonperturbative transition of quarks and gluons into final hadrons in heavy-ion collisions.Including hadronization effect,we can well describe Z^(0)/γ+hadrons correlations and Z^(0)/γ-tagged jet substructures in both p+p and Pb+Pb collisions simultaneously.Medium modification on jet profile and jet fragmentation functions indicate that particles carrying a large fraction of the jet momentum are generally closely aligned with the jet axis,whereas low-momentum particles are observed to have a much broader angular distribution relative to jet axis in Pb+Pb collisions due to jet-medium interactions.In particular,we find that Z^(0)/γ-tagged hadron correlations are sensitive to the soft particles from the dense medium and medium response,while jet-substructures show weak dependence on those soft hadrons with only a fraction of them falling inside the jet area.展开更多
In this study,the production of inclusive b-jet and bb dijets in Pb+Pb collisions has been investigated byconsidering the in-medium evolution of heavy and light quarks simultaneously.The initial hard processes of incl...In this study,the production of inclusive b-jet and bb dijets in Pb+Pb collisions has been investigated byconsidering the in-medium evolution of heavy and light quarks simultaneously.The initial hard processes of inclusiveb-jet and bb production are described using a next-to-leading order(NLO)plus parton shower Monte Carlo(MC)event generator,SHERPA,which can be well matched with the experimental data in p+p collisions.Theframework uses the Langevin transport model to describe the evolution of the bottom quark.Furthermore,the collisionalenergy loss and higher-twist description are considered to determine the radiative energy loss from both thebottom and light quarks.We compare the theoretical simulation of the inclusive jet and b-jet RAA in the Pb+Pb collisionsat√SNN=2:76 TeV with the experimental data and present the theoretical simulation of the momentum balanceof the bb dijet in the Pb+Pb collisions at 5.02 TeV along with recent CMS data for the first time.A similartrend to that seen in inclusive dijets is observed in bb dijets;the distribution of the production shifts to smaller xJ owingto the jet quenching effect.Finally,we report the prediction of the normalized azimuthal angle distribution of the bb dijet in the Pb+Pb collisions at 5.02 TeV.The medium-induced energy loss effect of the bb dijets will generallysuppress its production;however,the same side(ΔФ→0 region)suffers more energy loss than the far side(ΔФ→πregion),thus leading to suppression on the same side and enhancement on the far side in the normalized azimuthalangle distribution in A+A collisions.展开更多
基金supported by the Guangdong Major Project of Basic and Applied Basic Research(Grant No.2020B0301030008)the National Natural Science Foundation of China(Grant Nos.12147131,11935007,12035007,and 12022512)supported by the MOE Key Laboratory of Quark and Lepton Physics(CCNU)(Grant No.QLPL2021P01)。
文摘We carry out a detailed study of medium modifications on Z^(0)/γ+hadron correlations as well as jet substructures in association with Z^(0)/γ in Pb+Pb collisions with √S_(NN)=5.02TeV at the LHC.We utilize the linear Boltzmann transport(LBT)model to simulate the jet-medium interactions and medium response,and an extended cluster hadronization model to investigate the nonperturbative transition of quarks and gluons into final hadrons in heavy-ion collisions.Including hadronization effect,we can well describe Z^(0)/γ+hadrons correlations and Z^(0)/γ-tagged jet substructures in both p+p and Pb+Pb collisions simultaneously.Medium modification on jet profile and jet fragmentation functions indicate that particles carrying a large fraction of the jet momentum are generally closely aligned with the jet axis,whereas low-momentum particles are observed to have a much broader angular distribution relative to jet axis in Pb+Pb collisions due to jet-medium interactions.In particular,we find that Z^(0)/γ-tagged hadron correlations are sensitive to the soft particles from the dense medium and medium response,while jet-substructures show weak dependence on those soft hadrons with only a fraction of them falling inside the jet area.
基金supported by the National Natural Science Foundation of China(12035007,12022512,12147131,12225503,11890710,11890711,and 11935007)Guangdong Major Project of Basic and Applied Basic Research(2020B0301030008)+1 种基金supported by the MOE Key Laboratory of Quark and Lepton Physics(QLPL2021P01)supported by the National Science Foundation of USA(PHY-2209183).
基金Supported by Natural Science Foundation of China(11935007,11805167)。
文摘In this study,the production of inclusive b-jet and bb dijets in Pb+Pb collisions has been investigated byconsidering the in-medium evolution of heavy and light quarks simultaneously.The initial hard processes of inclusiveb-jet and bb production are described using a next-to-leading order(NLO)plus parton shower Monte Carlo(MC)event generator,SHERPA,which can be well matched with the experimental data in p+p collisions.Theframework uses the Langevin transport model to describe the evolution of the bottom quark.Furthermore,the collisionalenergy loss and higher-twist description are considered to determine the radiative energy loss from both thebottom and light quarks.We compare the theoretical simulation of the inclusive jet and b-jet RAA in the Pb+Pb collisionsat√SNN=2:76 TeV with the experimental data and present the theoretical simulation of the momentum balanceof the bb dijet in the Pb+Pb collisions at 5.02 TeV along with recent CMS data for the first time.A similartrend to that seen in inclusive dijets is observed in bb dijets;the distribution of the production shifts to smaller xJ owingto the jet quenching effect.Finally,we report the prediction of the normalized azimuthal angle distribution of the bb dijet in the Pb+Pb collisions at 5.02 TeV.The medium-induced energy loss effect of the bb dijets will generallysuppress its production;however,the same side(ΔФ→0 region)suffers more energy loss than the far side(ΔФ→πregion),thus leading to suppression on the same side and enhancement on the far side in the normalized azimuthalangle distribution in A+A collisions.
