Constituent quark model for nuclear stopping in high energy nuclear collisions

Abstract

We study the nuclear stopping in high energy nuclear collisions using the constituent quark model. It is assumed that wounded nucleons with different number of interacted quarks hadronize in different ways. The probabilities of having such wounded nucleons are evaluated for proton-proton, protonnucleus and nucleus-nucleus collisions. After examining our model in protonproton and proton-nucleus collisions and fixing the hadronization functions, it is extended to nucleus-nucleus collisions. It is used to calculate the rapidity distribution and the rapidity shift of final state protons in nucleus-nucleus collisions. The computed results are in good agreement with the experimental data on 32 S + 32 S at E lab = 200 AGeV and 208 Pb + 208 Pb at E lab = 160AGeV. Theoretical predictions are also given for proton rapidity distribution in 197 Au+ 197 Au at √ s = 200 AGeV (BNL-RHIC). We predict that the nearly baryon free region will appear in the midrapidity region and the rapidity shift is ∆y = 2.22.

Baryon number transport in high-energy nuclear collisions

“…Other models [7] can also achieve good fits to the existing p + A data with different parameterizations. For example, a recent fit with the constituent quark model was presented in [37]. The advantage of the MCM approach is in its simplicity, reducing the problem of the nuclear stopping power to one phenomenological parameter, α.…”

Transport model study of nuclear stopping in heavy-ion collisions over the energy range from0.09Ato160A GeV

“…Since the 1980s heavy-ion collisions (HICs) in terrestrial laboratories have become an important way to investigate properties of hot and dense nuclear matter [1][2][3][4][5][6][7][8]. In particular, the study of transport phenomena in nuclear reactions is of major importance for the understanding of many fundamental properties [9].…”

Proton fragmentation, baryon transport and hyperon production

“…There is no theoretical framework developed to systematically address all these fragmentation schemes; early theoretical work is mostly based on diquark fragmentation scheme for leading baryon production [4]. In fact, experimental measurements were not sufficient to constrain all fragmentation functions [5] and there is no conclusive experimental evidence for the gluon junction interaction. Recent p+A experiments are intended to better constrain theoretical models.…”