The photoproduction processes of large transverse momentum(pT)dimuonium(μ^(+)μ^(-))in AA collisions is calculated.We argue that the modification of electromagnetic radiation processes at large transverse momentum(p_...The photoproduction processes of large transverse momentum(pT)dimuonium(μ^(+)μ^(-))in AA collisions is calculated.We argue that the modification of electromagnetic radiation processes at large transverse momentum(p_(T)>2 GeV).Through perturbative quantum chromodynamics(pQCD)calculation,we determine the electromagnetic production cross section of large transverse momentum dimuonium(μ^(+)μ^(-))in quark-gluon plasma(QGP)at RHIC and LHC.The numerical results indicate that the contribution of photoproduction processes of dimuonium is evident in relativistic heavy ion collisions at RHIC energies and LHC energies.展开更多
We calculate the production of real photons originating from the photoproduction in relativistic pp collisions.The Weizsacker–Williams approximation in the photoproduction is considered.Numerical results agree with t...We calculate the production of real photons originating from the photoproduction in relativistic pp collisions.The Weizsacker–Williams approximation in the photoproduction is considered.Numerical results agree with the experimental data from the Relativistic Heavy Ion Collider and the Large Hadron Collider.We find that the modification of the photoproduction is more prominent in large transverse momentum regions.展开更多
The production of J/ψ originating from photoproduction processes in pp and PbPb collisions at leading order is calculated.We use the color singlet and color octet mechanisms for heavy quarkonium production to deal wi...The production of J/ψ originating from photoproduction processes in pp and PbPb collisions at leading order is calculated.We use the color singlet and color octet mechanisms for heavy quarkonium production to deal with the direct photon processes,and consider fragmentation processes.The shadowing and iso-spin of the nucleus are also considered in our calculation.The numerical results show that the modification of photoproduction processes for J/ψ production becomes obvious in the large pT region at LHC energy.展开更多
A new concept,rigidity of pseudo-rapidity spectrum,is extended into the study of the multiplicity fluctuations in high energy nucleus-nucleus interactions.In using the novel method to analyze the data of l6O-Em at 14....A new concept,rigidity of pseudo-rapidity spectrum,is extended into the study of the multiplicity fluctuations in high energy nucleus-nucleus interactions.In using the novel method to analyze the data of l6O-Em at 14.6,60,and 200A GeV,and ^(32)S-Em at 200A GeV,it is found that the rigidity of pseudo-rapidity spectrum in the central domain of pseudo-rapidity might be a mixture of Poisson type and Wigner one.展开更多
Hard photoproduction of J/ψandγat large hadron collider Pb-Pb collisions with center of mass energy 6300AGeV is discussed in the process Pb+Pb→Pb+J/ψ(Γ)+X with three types of equivalent photon spectrum function.I...Hard photoproduction of J/ψandγat large hadron collider Pb-Pb collisions with center of mass energy 6300AGeV is discussed in the process Pb+Pb→Pb+J/ψ(Γ)+X with three types of equivalent photon spectrum function.It turns out that in hard photoproduction the J/ψcross section is dominated by the gluon and heavy quark fragmentation,especially the gluon fragmentation is very important at large pt,while theγcross section is dominated by the leading order process.It may be conclude from the result that the hard photoproduction processes can be used to test several important problems such as the gluon distribution in the nucleus,gluon and heavy quark fragmentation of J/ψ,and so on.In addition the process also provide a new way of testing the EMC effects.展开更多
基金Supported by the National Natural Science Foundation of China under Grant Nos 10665003 and 11065010.
文摘The photoproduction processes of large transverse momentum(pT)dimuonium(μ^(+)μ^(-))in AA collisions is calculated.We argue that the modification of electromagnetic radiation processes at large transverse momentum(p_(T)>2 GeV).Through perturbative quantum chromodynamics(pQCD)calculation,we determine the electromagnetic production cross section of large transverse momentum dimuonium(μ^(+)μ^(-))in quark-gluon plasma(QGP)at RHIC and LHC.The numerical results indicate that the contribution of photoproduction processes of dimuonium is evident in relativistic heavy ion collisions at RHIC energies and LHC energies.
基金Supported by the National Natural Science Foundation of China under Grant Nos 10665003,11065010.
文摘We calculate the production of real photons originating from the photoproduction in relativistic pp collisions.The Weizsacker–Williams approximation in the photoproduction is considered.Numerical results agree with the experimental data from the Relativistic Heavy Ion Collider and the Large Hadron Collider.We find that the modification of the photoproduction is more prominent in large transverse momentum regions.
基金Supported by the National Natural Science Foundation of China under Grant Nos 10665003 and 11065010.
文摘The production of J/ψ originating from photoproduction processes in pp and PbPb collisions at leading order is calculated.We use the color singlet and color octet mechanisms for heavy quarkonium production to deal with the direct photon processes,and consider fragmentation processes.The shadowing and iso-spin of the nucleus are also considered in our calculation.The numerical results show that the modification of photoproduction processes for J/ψ production becomes obvious in the large pT region at LHC energy.
基金Supported by the National Natural Science Foundation of China under Grant No.19475014the Natural Science Foundation of Hubei Province。
文摘A new concept,rigidity of pseudo-rapidity spectrum,is extended into the study of the multiplicity fluctuations in high energy nucleus-nucleus interactions.In using the novel method to analyze the data of l6O-Em at 14.6,60,and 200A GeV,and ^(32)S-Em at 200A GeV,it is found that the rigidity of pseudo-rapidity spectrum in the central domain of pseudo-rapidity might be a mixture of Poisson type and Wigner one.
基金Supported in part by the National Natural Science Foundation of China.
文摘Hard photoproduction of J/ψandγat large hadron collider Pb-Pb collisions with center of mass energy 6300AGeV is discussed in the process Pb+Pb→Pb+J/ψ(Γ)+X with three types of equivalent photon spectrum function.It turns out that in hard photoproduction the J/ψcross section is dominated by the gluon and heavy quark fragmentation,especially the gluon fragmentation is very important at large pt,while theγcross section is dominated by the leading order process.It may be conclude from the result that the hard photoproduction processes can be used to test several important problems such as the gluon distribution in the nucleus,gluon and heavy quark fragmentation of J/ψ,and so on.In addition the process also provide a new way of testing the EMC effects.
