TY - JOUR
T1 - Energy dependence of kaon-to-proton ratio fluctuations in central Pb+Pb collisions from √sNN=6.3 to 17.3 GeV
AU - Anticic, T.
AU - Baatar, B.
AU - Botje, M.A.J.
AU - Christakoglou, P.
AU - van Leeuwen, M.
AU - Wojtaszek-Szwarc, A.
PY - 2011
Y1 - 2011
N2 - Kaons and protons carry large parts of two conserved quantities: strangeness and baryon number. It is argued that their correlation and thus also fluctuations are sensitive to conditions prevailing at the anticipated parton-hadron phase boundary. Fluctuations of the (K++K-)/(p+p̅ ) and K+/p ratios have been measured for the first time by NA49 in central Pb+Pb collisions at five CERN Super Proton Synchrotron energies between √sNN=6.3 and √sNN=17.3 GeV. Both ratios exhibit a change of sign in σdyn, a measure of nonstatistical fluctuations, around √sNN=8 GeV. Below this energy, σdyn is positive, indicating higher fluctuation compared to a mixed event background sample, while for higher energies, σdyn is negative, indicating correlated emission of kaons and protons. The results are compared to hadronic transport model calculations which fail to reproduce the energy dependence.
AB - Kaons and protons carry large parts of two conserved quantities: strangeness and baryon number. It is argued that their correlation and thus also fluctuations are sensitive to conditions prevailing at the anticipated parton-hadron phase boundary. Fluctuations of the (K++K-)/(p+p̅ ) and K+/p ratios have been measured for the first time by NA49 in central Pb+Pb collisions at five CERN Super Proton Synchrotron energies between √sNN=6.3 and √sNN=17.3 GeV. Both ratios exhibit a change of sign in σdyn, a measure of nonstatistical fluctuations, around √sNN=8 GeV. Below this energy, σdyn is positive, indicating higher fluctuation compared to a mixed event background sample, while for higher energies, σdyn is negative, indicating correlated emission of kaons and protons. The results are compared to hadronic transport model calculations which fail to reproduce the energy dependence.
U2 - 10.1103/PhysRevC.83.061902
DO - 10.1103/PhysRevC.83.061902
M3 - Article
SN - 0556-2813
VL - 83
SP - 061902/1-061902/5
JO - Physical Review. C, Nuclear physics
JF - Physical Review. C, Nuclear physics
IS - 6
ER -