Light (anti-)nuclei and (anti-)hypertriton production in $pp$ collisions at $\sqrt{s}=0.90,2.76$ and $7$ TeV

Abstract

Production of light (anti-)nuclei and (anti-)hypertriton within midrapidity ($|y|<0.5$) and $p_T<3.0$ GeV/c in $pp$ interactions at $\sqrt{s}$ = 0.90, 2.76 and 7 TeV is investigated by the dynamically constrained phase space coalescence model (DCPC), combined with {\footnotesize{PACIAE}} model. The ALICE data for yields, ratios, as well as transverse momentum distributions of $\overline{d}$ and $d$ are well reproduced by the model simulations, meanwhile the three basic characters of ${}^3\overline{\mathrm{He}}$, ${}^3\mathrm{He}$, ${}_{\overline{\mathrm{\Lambda }}}^3\overline{\mathrm{H}}$, and ${}_{\mathrm{\Lambda }}^3\mathrm{H}$ are also predicted. Besides, we found the yields of light (anti-)nuclei produced are dependent upon their mass number $A$, namely, their yields sharply decrease with the increasing of $A$. The strangeness population factor $s_3=({}_{\mathrm{\Lambda }}^3\mathrm{H}/{}^3\mathrm{He})/(\Lambda /p)$ is found to be about 0.7 $\sim$ 0.8, and is comparable with the available experimental results.

arXiv comment7pages, 4 figures

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