Universal anti-baryon density in $e^+e^-$,$γp$, pp, pA and AA collisions
| dc.creator | Liu, Haidong | |
| dc.creator | Xu, Zhangbu | |
| dc.date | 2006-10-24 | |
| dc.date.accessioned | 2026-07-07T07:29:46Z | |
| dc.date.available | 2026-07-07T07:29:46Z | |
| dc.description | We compiled the systematical measurements of anti-nucleus production in ultra-relativistic heavy ion collisions as well as those in $pp$, $p\bar{p}$, $γp$ and $e^{+}e^{-}$ at various beam energies. The anti-baryon phase space density inferred from $\bar{d}/\bar{p}$ ratio in $A+A$, $p+A$, $pp(\bar{p})$ and $γp$ collisions is found to follow a universal distribution as a function of center of mass of beam energy and can be described in a statistical model. We demonstrated that anti-baryon density in all the collisions is the highest when the collisions are dominated by the processes of $g+g$ or $\bar{q}+g$. In $e^+e^-$ collisions at LEP, the cross section of $q\bar{q}g$ is suppressed by a factor of strong coupling constant $α_s$ relative to $q\bar{q}$. This can consistently explain the $\bar{d}$ suppression observed by ALEPH relative to that in $e^+e^-\to ggg$ by ARGUS. We discuss the implications to the baryon enhancement at high transverse momentum at RHIC when jet is quenched. | |
| dc.description | 11 pages, 3 figures | |
| dc.identifier | https://arxiv.org/abs/nucl-ex/0610035 | |
| dc.identifier | http://arxiv.org/abs/nucl-ex/0610035 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/118241 | |
| dc.subject | Nuclear Experiment | |
| dc.title | Universal anti-baryon density in $e^+e^-$,$γp$, pp, pA and AA collisions | |
| dc.type | text |