A pr 2 00 1 1 Regeneration of Anti - Protons in Ultrarelativistic Heavy - Ion Collisions ∗
نویسنده
چکیده
The production and annihilation of antiprotons in the hadronic phase of heavy-ion collisions is evaluated within a thermal equilibrium approach. It is shown that the inverse reaction of pp̄ annihilation (i.e., multi-pion annihilation Nππ → pp̄ with Nπ ≃ 5-7) in connection with oversaturation of pion phase space (i.e., finite pion chemical potentials) plays an important role in understanding the observed antiproton yields at SpS energies within the standard picture of subsequent chemical and thermal freezeout. Implications for RHIC energies are also addressed.
منابع مشابه
ar X iv : h ep - p h / 03 03 12 1 v 2 2 9 A pr 2 00 3 Partonic energy loss in ultrarelativistic heavy ion collisions : jet suppression versus jet fragmentation softening
We discuss the modification of a jet fragmentation function due to medium-induced partonic energy loss in context of leading particle observables in ultrarelativistic nucleus-nucleus interactions. We also analyze the relation between in-medium softening jet fragmentation function and suppression of the jet rates due to energy loss outside the jet cone. The predicted anti-correlation between two...
متن کامل- th / 0 10 10 35 v 2 1 8 A pr 2 00 1 Mutual heavy ion dissociation in peripheral collisions at ultrarelativistic energies
We study mutual dissociation of heavy nuclei in peripheral collisions at ultrarelativistic energies. Earlier this process was proposed for beam luminosity monitoring via simultaneous registration of forward and backward neutrons in zero degree calorimeters at Relativistic Heavy Ion Collider. Electromagnetic dissociation of heavy ions is considered in the framework of the Weizsäcker-Williams met...
متن کاملar X iv : h ep - p h / 03 03 12 1 v 1 1 4 M ar 2 00 3 Partonic energy loss in ultrarelativistic heavy ion collisions : jet suppression versus jet fragmentation softening
We discuss the modification of a jet fragmentation function due to medium-induced partonic energy loss in context of leading particle observables in ultrarelativistic nucleus-nucleus interactions. We also analyze the relation between in-medium softening jet fragmentation function and suppression of the jet rates due to energy loss outside the jet cone. The predicted anti-correlation between two...
متن کاملar X iv : h ep - p h / 03 03 12 1 v 3 3 0 M ay 2 00 3 Partonic energy loss in ultrarelativistic heavy ion collisions : jet suppression versus jet fragmentation softening
We discuss the modification of a jet fragmentation function due to medium-induced partonic energy loss in context of leading particle observables in ultrarelativistic nucleus-nucleus interactions. We also analyze the relation between in-medium softening jet fragmentation function and suppression of the jet rates due to energy loss outside the jet cone. The predicted anti-correlation between two...
متن کامل- th / 0 10 40 21 v 2 1 2 A pr 2 00 1 1 Multiple scattering and p t - broadening at RHIC energies
In ultrarelativistic heavy-ion collisions, in the 2 GeV< p ⊥ < 6 GeV transverse momentum region, the soft and semi-hard multiple scattering of the incoming nucleons in the nuclear medium results in the broadening of the expected hadronic (e.g. pion) p ⊥ spectra relative to proton-proton (pp) collisions. Thus, higher transverse-momentum regions are populated than in pp collisions. In a perturbat...
متن کامل