Production of Omega NN and Omega Omega N in ultra-relativistic heavy-ion collisions

Abstract

Even though lots of Lambda -hypernuclei have been found and measured, multi-strangeness hypernuclei consisting of Omega are not yet discovered. The studies of multi-strangeness hypernuclei help us further understand the interaction between hyperons and nucleons. Recently the Omega N and Omega Omega interactions as well as binding energies were calculated by the HAL-QCD’s lattice Quantum Chromo-Dynamics (LQCD) simulations and production rates of Omega -dibaryon in Au + Au collisions at RHIC and Pb + Pb collisions at LHC energies were estimated by a coalescence model. The present work discusses the production of more exotic triple-baryons including Omega , namely Omega NN and Omega Omega N as well as their decay channels. A variation method is used in calculations of bound states and binding energy of Omega NN and Omega Omega N with the potentials from the HAL-QCD’s results. The productions of Omega NN and Omega Omega N are predicted by using a blast-wave model plus coalescence model in ultra-relativistic heavy-ion collisions at sqrt{s_{NN}} = 200 GeV and 2.76 TeV. Furthermore, plots for baryon number dependent yields of different baryons (N and Omega ), their dibaryons and hypernuclei are made and the production rate of a more exotic tetra-baryon (Omega Omega NN) is extrapolated.