Antiproton evolution in little bangs and in the Big Bang

H. Schade and B. Kämpfer
Phys. Rev. C 79, 044909 – Published 21 April 2009

Abstract

The abundances of antiprotons and protons are considered within momentum-integrated Boltzmann equations describing Little Bangs, i.e., fireballs created in relativistic heavy-ion collisions. Despite a large antiproton annihilation cross section we find a small drop of the ratio of antiprotons to protons from 170 MeV (chemical freeze-out temperature) to 100 MeV (kinetic freeze-out temperature) for CERN-SPS and BNL-RHIC energies thus corroborating the solution of the previously exposed “antiproton puzzle”. In contrast, the Big Bang evolves so slowly that the antibaryons are kept for a long time in equilibrium resulting in an exceedingly small fraction. The adiabatic path of cosmic matter in the phase diagram of strongly interacting matter is mapped out.

  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
1 More
  • Received 6 October 2007

DOI:https://doi.org/10.1103/PhysRevC.79.044909

©2009 American Physical Society

Authors & Affiliations

H. Schade and B. Kämpfer

  • Forschungszentrum Dresden-Rossendorf, PF 510119, D-01314 Dresden, Germany and TU Dresden, Institut für Theoretische Physik, D-01062 Dresden, Germany

Article Text (Subscription Required)

Click to Expand

References (Subscription Required)

Click to Expand
Issue

Vol. 79, Iss. 4 — April 2009

Reuse & Permissions
Access Options
Author publication services for translation and copyediting assistance advertisement

Authorization Required


×
×

Images

×

Sign up to receive regular email alerts from Physical Review C

Log In

Cancel
×

Search


Article Lookup

Paste a citation or DOI

Enter a citation
×