https://doi.org/10.1140/epja/i2017-12252-3
Regular Article - Theoretical Physics
Excitation functions of parameters extracted from three-source (net-)proton rapidity distributions in Au-Au and Pb-Pb collisions over an energy range from AGS to RHIC
1
Institute of Theoretical Physics, Shanxi University, 030006, Taiyuan, Shanxi, China
2
Department of Physics, Shanxi Datong University, 037009, Datong, Shanxi, China
3
Departments of Chemistry & Physics, Stony Brook University, 11794, Stony Brook, NY, USA
* e-mail: fuhuliu@163.com
Received:
19
September
2016
Accepted:
11
March
2017
Published online:
24
March
2017
Experimental results of the rapidity spectra of protons and net-protons (protons minus antiprotons) emitted in gold-gold (Au-Au) and lead-lead (Pb-Pb) collisions, measured by a few collaborations at the alternating gradient synchrotron (AGS), super proton synchrotron (SPS), and relativistic heavy ion collider (RHIC), are described by a three-source distribution. The values of the distribution width and fraction
of the central rapidity region, and the distribution width
and rapidity shift
of the forward/backward rapidity regions, are then obtained. The excitation function of
increases generally with increase of the center-of-mass energy per nucleon pair
. The excitation function of
shows a saturation at
GeV. The excitation function of
shows a minimum at
GeV and a saturation at
GeV. The excitation function of
increases linearly with
in the considered energy range.
© SIF, Springer-Verlag Berlin Heidelberg, 2017