Thermal hadron production in Si-Au collisions

Abstract

The most abundantly produced hadron species in Si−Au collisions at the BNL-AGS (nucleons, pions, kaons, antikaons and hyperons) are shown to be in accord with emission from a thermal resonance gas source of temperature T ≃ 110 MeV and baryochemical potential µ B ≃ 540 MeV, corresponding to about 1/3 standard nuclear density. Our analysis takes the isopin asymmetry of the initial state fully into account.

Features of particle multiplicities and strangeness production in central heavy ion collisions between1.7Aand158A GeV/cBecattini1, Cleymans2, Keränen3 et al. 2001Phys. Rev. CSelf Cite376213030View full textAdd to dashboardCite

“…In order to further study strangeness production and enhancement at low energy, we also present a new analysis of Si-Au collisions at 14.6A GeV (AGS) using only multiplicities obtained from fully integrated phase space distributions. This also allows to cross-check results of previous analyses [9,10,13] performed using limited rapidity interval data. In particular, we have included the 4π pion multiplicity [11] and results presented in [12].…”

Production of light nuclei, hypernuclei and their antiparticles in relativistic nuclear collisions

“…As expected, the measured energy dependence of the 3 He/ 3 H is well reproduced by the model calculations. On the other hand, the discrepancy between thermal model predictions and data for the 3 Λ H/( 3 He(Λ/p)) ratio is apparent (red line). It is important to realize that the ratio Λ/p is significantly influenced by feed-down from strong decays of excited baryonic states, leading to a value for the double ratio significantly below unity.…”

“…The degree of agreement between data and calculations is impressive. We also include in this figure thermal model predictions for the energy dependence of the ratio 3 Λ H/ 3 He and 3 ΛH / 3H e. The broad maximum around √ s N N ≃5 GeV for the ratio 3 ΛH / 3H e has the same origin as the maximum in the K + /π + ratio, namely it arises as a consequence of strangeness neutrality condition, imposed in our model, and a competition between rising T and decreasing µ b [13]. We also note that a slightly less prominent maximum is likely to survive even if one relaxes the condition of strangeness neutrality, as demonstrated in [33].…”

Statistical hadronization of supercooled quark-gluon plasma

“…In order to satisfy the conservation equation ͑10͒ for strange quark 2 The massive s,s quarks give a little correction to this simple rule, but we suppress that in the text. pairs, additional fugacity ␥ S is introduced for each strange particle i as i → i ␥ S ͉S i ͉ .…”