${}_{\mathrm{\Lambda }}^3\mathrm{H}$ and ${}_{\overline{\mathrm{\Lambda }}}^3\overline{\mathrm{H}}$ production and characterization in Cu+Cu collisions at $\sqrt{s_{\mathrm{NN}}}=200$GeV

Abstract

Production of the (anti)hypertriton nuclei ${}_{\mathrm{\Lambda }}^3\mathrm{H}$ and ${}_{\overline{\mathrm{\Lambda }}}^3\overline{\mathrm{H}}$ in Cu+Cu interactions at $\sqrt{s_{\mathrm{NN}}}=200$GeV is studied at three centrality bins of 0-10\%, 10-30\% and 30-60\% using the dynamically constrained phase-space coalescence model together with [PACIAE] model simulations. The ${}^3\mathrm{H}{(}^3\overline{\mathrm{H}})$ and ${}^3\mathrm{He}{(}^3\overline{\mathrm{He}})$ nuclei has been compared. It is indicated by the study that the yields of light nuclei and hypernuclei increase rapidly from peripheral to central collisions while their anti-particle to particle ratios keep unchanged for different centrality bins. The strangeness population factor $S_3={}_{\mathrm{\Lambda }}^3\mathrm{H}/({}^3\mathrm{He}\times \Lambda /p)$ was found to be close to unity, and was compatible with the STAR data and theoretical model calculation, suggesting that the phase-space population of strange quarks is similar with the ones of light quarks and the creation of deconfined high temperature quark matter in Cu+Cu collisions.

7 pages, 5 figures

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