Transient field fluctuations effects ind+Auand Au+Au collisions atsNN=200

Abstract

The effect of fluctuations of strong color electric fields (SCF) on the baryon production in d+Au and Au+Au collisions at 200A GeV is studied in the framework of the HIJING/BB v2.0 model. It is shown that the dynamics of the production process deviates considerably from calculations based on Schwinger-like estimates for homogeneous and constant color fields. An increase of the string tension from κ0 = 1 GeV/fm, to in medium mean values of 1.5 to 2.0 GeV/fm and 2.0 to 3.0 GeV/fm for d+Au and Au+Au, respectively, results in a consistent description of the observed nuclear modification factors R dAu and RAuAu (that relates (d)Au+Au and p+p collisions), and point to the relevance of fluctuations of transient color fields. The differences between nuclear modification factors RAuAu and RCP (that relates central and peripheral collisions) are also discussed. The measurement of multi-strange (anti)hyperons (Ξ, Ω) yields would provide a crucial test of the importance of SCF fluctuations at RHIC energies.

Model for hypernucleus production in heavy ion collisions

“…[39]). Note that κ = |eE| eff = √ C 2 (A)/C 2 (F ) κ 0 is the effective string tension in terms of the vacuum string tension κ 0 ≈ 1 GeV/fm, and C 2 (A), C 2 (F ) are the second-order Casimir operators (see Ref.…”

“…[38,39]). We take into account the SCF in our model by an in-medium effective string tension κ > κ 0 , which leads to new values for the suppression factors, as well as the new effective intrinsic transverse momentum k T .…”

“…In this paper, we extend our study in the framework of the HIJING/BB v2.0 model [39] to strange particle production at the FAIR and MPD/NICA energy range ( √ s NN = 2.7-9.4 GeV). The experimental situation has so far been rather poor for measurements of strange particles at forward rapidities, due to limited acceptances of the detectors.…”

“…The SCF effects are also a possible source of novel baryon/hyperon physics. In our previous works [38][39][40][41], we explored, with the HIJING/BB v2.0 model calculations, the possible dynamical effects associated with a long-range coherent field that may arise in rHICs. These analyses point to the need for collective motion, together with high initial-state energy densities.…”

Multiplicity-dependent pT distributions of identified particles in pp collisions at 7 TeV within the HIJING/ BB¯Pop1, Petrovici2 2018Phys. Rev. CSelf Cite1000View full textAdd to dashboardCite

“…Heavy ion jet interacting (HIJING)-type models [32,33], HIJING2.0 [53,54], and HIJING/BB v2.0 [55][56][57][58][59][60][61][62][63][64][65] were developed in order to explain the hadron production in pp, p-A, and A-A collisions. These approaches are based on a two-component geometrical model of minijet production and soft interaction and incorporate nuclear effects such as shadowing and jet quenching, via final-state jet medium interaction.…”