Generalized Boltzmann approximation of the phase-space distribution function of quarks in the quark phase and of pions in the hadron phase,adopted by previous authors,to a complete expression,the dilepton production i...Generalized Boltzmann approximation of the phase-space distribution function of quarks in the quark phase and of pions in the hadron phase,adopted by previous authors,to a complete expression,the dilepton production in Bjorken's(1+1)dimensional scaling expansion system is studied.We find that the dilepton production is heightened,and the shape of the characteristic dilepton dietribution for the quark matter formation in ultrarelativistic nucleus-nucleus collisions is significantly changed.展开更多
The previously derived relativistic hydrodynamic equation from energy-momentum conservation is generalized to include the particle number conservation.From calculation on the basis of the new formalism we find that th...The previously derived relativistic hydrodynamic equation from energy-momentum conservation is generalized to include the particle number conservation.From calculation on the basis of the new formalism we find that the particle distribution and latent heat significantly change the characteristic dilepton spectrum for the formation of a quark matter,which had been predicted by the other author.展开更多
With the increase of the initial baryon density,the dilepton production in invariant masses between 2mπ and 1 GeV is shown to be suppressed and an abnormal peak of the dilepton spectrum appears near the invariant mas...With the increase of the initial baryon density,the dilepton production in invariant masses between 2mπ and 1 GeV is shown to be suppressed and an abnormal peak of the dilepton spectrum appears near the invariant mass 0.75 GeV if a baryon-rich quark-gluon matter was formed in the ultrarelativistic nucleus-nucleus collision.These predictions are important for several large-scale experiments at CERN and Brookhaven.展开更多
The temperature dependent energy and corresponding internal pressure of the hadron are obtained by taking Fermi weighted sums over internal discrete energy levels.We find that beyond the critical temperature,the solut...The temperature dependent energy and corresponding internal pressure of the hadron are obtained by taking Fermi weighted sums over internal discrete energy levels.We find that beyond the critical temperature,the solution of the hadron radius determined from the balance relation between the internal and external pressures of the hadron disappears,which shows that the quark deconfinement transition has occured.In addition,it is shown that the heat bath plays role in delaying the deconfinement process.展开更多
文摘Generalized Boltzmann approximation of the phase-space distribution function of quarks in the quark phase and of pions in the hadron phase,adopted by previous authors,to a complete expression,the dilepton production in Bjorken's(1+1)dimensional scaling expansion system is studied.We find that the dilepton production is heightened,and the shape of the characteristic dilepton dietribution for the quark matter formation in ultrarelativistic nucleus-nucleus collisions is significantly changed.
基金Project supported by the National Science Foundation of China.
文摘The previously derived relativistic hydrodynamic equation from energy-momentum conservation is generalized to include the particle number conservation.From calculation on the basis of the new formalism we find that the particle distribution and latent heat significantly change the characteristic dilepton spectrum for the formation of a quark matter,which had been predicted by the other author.
文摘With the increase of the initial baryon density,the dilepton production in invariant masses between 2mπ and 1 GeV is shown to be suppressed and an abnormal peak of the dilepton spectrum appears near the invariant mass 0.75 GeV if a baryon-rich quark-gluon matter was formed in the ultrarelativistic nucleus-nucleus collision.These predictions are important for several large-scale experiments at CERN and Brookhaven.
文摘The temperature dependent energy and corresponding internal pressure of the hadron are obtained by taking Fermi weighted sums over internal discrete energy levels.We find that beyond the critical temperature,the solution of the hadron radius determined from the balance relation between the internal and external pressures of the hadron disappears,which shows that the quark deconfinement transition has occured.In addition,it is shown that the heat bath plays role in delaying the deconfinement process.
