Model for hypernucleus production in heavy ion collisions

Abstract

We estimate the production cross sections of hypernuclei in projectile like fragment (PLF) in heavy ion collisions. The discussed scenario for the formation cross section of hypernucleus is: (a) Lambda particles are produced in the participant region but have a considerable rapidity spread and (b) Lambda with rapidity close to that of the PLF and total momentum (in the rest system of PLF) up to Fermi motion can then be trapped and produce hypernuclei. The process (a) is considered here within Heavy Ion Jet Interacting Generator HIJING-BBbar model and the process (b) in the canonical thermodynamic model (CTM). We estimate the production cross-sections for light hypernuclei for C + C at 3.7 GeV total nucleon-nucleon center of mass energy and for Ne+Ne and Ar+Ar collisions at 5.0 GeV. By taking into account explicitly the impact parameter dependence of the colliding systems, it is found that the cross section is different from that predicted by the coalescence model and large discrepancy is obtained for 6_He and 9_Be hypernuclei.Comment: 9 pages, 4 figures, 3 tables, revtex4, added reference

Heavy-ion collisions at the LHC—Last call for predictions

“…A reduction of the strange (s) quark mass from M s = 350 MeV to the current quark mass of approximately m s = 150 MeV gives a strangeness suppression factor γ 1 s ≈ 0.70. A similar value of γ 1 s (0.69) is obtained by increasing the string tension from κ 0 = 1.0 GeV fm −1 to κ = 3.0 GeV fm −1 [145]. However, if we consider that Schwinger tunneling could explain the thermal character of hadron spectra we can define an apparent temperature as a function of the average value of string tension ( κ ), T = √ 3 κ /4π [149].…”

“…In previous publications [145], we studied the possible role of topological baryon junctions [25] and the effects of strong color field (SCF) in nucleus-nucleus collisions at RHIC energies. We have shown that the dynamics of the production process can deviate considerably from that based on Schwinger-like estimates for homogeneous and constant color fields.…”

“…In previous papers [24] we studied the possible role of topological baryon junctions [25] [26], and the effects of strong color field (SCF) in nucleus-nucleus collisions at RHIC energies. In the framework of HIJING/B B v2.0 model, the new algorithm for junction antijunction J J loops provide a possible explanation for baryon/meson anomaly.…”

Light neutron-rich hypernuclei from the importance-truncated no-core shell model

“…Some are not accessible in experiments that produce hypernuclei off stable targets. However, the possibility of using heavy ion collisions to produce hypernuclei of widely varying mass and proton-neutron asymmetry is actively discussed [31,32] so that these hypernuclei may become accessible in the future.…”

Scaling properties of light (anti)nuclei and (anti)hypertriton production in Au+Au collisions at $\sqrt{{{s}_{{\rm NN}}}}=200$ GeV

“…The second and presumably dominant mechanism for (anti)nuclei production is via final-state coalescence [7][8][9]. This production mechanism of light (anti)nuclei and (anti)hypernuclei is usually studied by the transport models plus the phase space coalescence model [10][11][12] and/or the statistical model [13][14][15][16], etc. In the thermodynamic model, the system is characterized by the chemical freeze-out temperature T ( ) ch and the kinetic freeze-out temperature T ( ) kin as well as the baryon and strangeness chemical potentials μ B and μ S .…”