Phenomenology of light- and strange-quark simultaneous production at high energies

Abstract

© 2017, Pleiades Publishing, Ltd. This letter presents an extension of EPL116(2017)62001 to light- and strange-quark nonequilibrium chemical phase-space occupancy factors (γq,s). The resulting damped trigonometric functionalities relating γq,sto the nucleon-nucleon center-of-mass energies (sNN) looks very similar except different coefficients. The phenomenology of the resulting γq,s(sNN) describes a rapid decrease at sNN ≲ 7GeV followed by a faster increase up to ~20 GeV. Then, both γq,sbecome nonsensitive to sNN. Although these differ from γs(sNN)obtained at γq(sNN)=1, various particle ratios including K+/π+, K−/π−, Λ/π−, Λ̄/π−, Ξ+/π+, and Ω/π−, can well be reproduced, as well. We conclude that γq,s(sNN) should be instead determined from fits of various particle yields and ratios but not merely from fits to the particle ratio K+/π+.