Abstract:
This letter presents an extension of EPL116(2017) 62001 to light- and strange-quark nonequilibrium chemical phase-space occupancy factors (gamma(q,s)). The resulting damped trigonometric functionalities relating gamma(q,s) to the nucleon-nucleon center-of-mass energies (root s(NN)) looks very similar except different coefficients. The phenomenology of the resulting gamma(q,s) (root s(NN)) describes a rapid decrease at root s(NN) less than or similar to 7 GeV followed by a faster increase up to similar to 20 GeV. Then, both gamma(q,s) become nonsensitive to root s(NN). Although these differ from gamma(s) (root s(NN)) obtained at gamma(q) (root s(NN)) = 1, various particle ratios including K+/pi(+), K-/pi(-), Lambda/pi(-), (Lambda) over bar/pi(-), Xi(+)/pi(+), and Omega/pi(-), can well be reproduced, as well. We conclude that gamma(q,s) (root s(NN)) should be instead determined from fits of various particle yields and ratios but not merely from fits to the particle ratio k(+)/pi(+).
