Freeze-out conditions from strangeness observables at RHIC
Résumé
We determine chemical freeze-out conditions from strangeness observables measured at RHIC beam energies. Based on a combined analysis of lowest-order net-kaon fluctuations and strange anti-baryon over baryon yield ratios we obtain visibly enhanced freeze-out conditions at high beam energies compared to previous studies which analyzed net-proton and net-charge fluctuations. Our findings are in qualitative agreement with the recent study (Bellwied et al. in arXiv:1805.00088 [hep-ph], 2018) which utilizes the net-kaon fluctuation data in combination with information from lattice QCD. Our complementary approach shows that also strange hadron yield ratios are described by such enhanced freeze-out conditions.
Mots clés
12.38.Mh
25.75.Nq
net-Kaon fluctuations
strangeness production
QCD phase diagram
beam: energy
freeze-out: chemical
yield: ratio
hadron: yield: ratio
baryon: yield
fluctuation
Brookhaven RHIC Coll
strangeness: production
lattice field theory
antibaryon
potential: chemical
quantum chromodynamics: matter