2 search hits

Effects of strong color fields on baryon dynamics
(2002)

Sven Soff
Jørgen Randrup
Horst Stöcker
Nu Xu
 We calculate the antibaryontobaryon ratios, antip/p, antiLambda/Lambda, antiXi/Xi, and antiOmega/Omega for Au+Au collisions at RHIC (sqrt{s}_{NN}=200 GeV). The effects of strong color fields associated with an enhanced strangeness and diquark production probability and with an effective decrease of formation times are investigated. Antibaryontobaryon ratios increase with the color field strength. The ratios also increase with the strangeness content S. The netbaryon number at midrapidity considerably increases with the color field strength while the netproton number remains roughly the same. This shows that the enhanced baryon transport involves a conversion into the hyperon sector (hyperonization) which can be observed in the (Lambda  antiLambda)/(p  antip) ratio.

Antiflow of nucleons at the softest point of the EoS
(1999)

Jörg Brachmann
Sven Soff
Adrian Dumitru
Horst Stöcker
Joachim Maruhn
Walter Greiner
DirkHermann Rischke
 Reportno: UFTP492/1999 Journalref: Phys.Rev. C61 (2000) 024909 We investigate flow in semiperipheral nuclear collisions at AGS and SPS energies within macroscopic as well as microscopic transport models. The hot and dense zone assumes the shape of an ellipsoid which is tilted by an angle Theta with respect to the beam axis. If matter is close to the softest point of the equation of state, this ellipsoid expands predominantly orthogonal to the direction given by Theta. This antiflow component is responsible for the previously predicted reduction of the directed transverse momentum around the softest point of the equation of state.