Multiplicity-dependent production of $\Sigma (1385{)}^{\pm }$ and $\Xi (1530{)}^0$ in pp collisions at $\sqrt{s}=13$ TeV

Abstract

The production yields of the $\Sigma (1385{)}^{\pm }$ and $\Xi (1530{)}^0$ resonances are measured in pp collisions at $\sqrt{s}=13$ TeV with ALICE. The measurements are performed as a function of the charged-particle multiplicity $⟨\mathrm{d}{N}_{\mathrm{ch}}/\mathrm{d}\eta ⟩$, which is related to the energy density produced in the collision. The results include transverse momentum ($p_{\mathrm{T}}$) distributions, $p_{\mathrm{T}}$-integrated yields, mean transverse momenta of $\Sigma (1385{)}^{\pm }$ and $\Xi (1530{)}^0$, as well as ratios of the $p_{\mathrm{T}}$-integrated resonance yields relative to yields of other hadron species. The $\Sigma (1385{)}^{\pm }/{\pi }^{\pm }$ and $\Xi (1530{)}^0/{\pi }^{\pm }$ yield ratios are consistent with the trend of the enhancement of strangeness production from low to high multiplicity pp collisions, which was previously observed for strange and multi-strange baryons. The yield ratio between the measured resonances and the long-lived baryons with the same strangeness content exhibits a hint of a mild increasing trend at low multiplicity, despite too large uncertainties to exclude the flat behaviour. The results are compared with predictions from models such as EPOS-LHC and PYTHIA 8 with Rope shoving. The latter provides the best description of the multiplicity dependence of the $\Sigma (1385{)}^{\pm }$ and $\Xi (1530{)}^0$ production in pp collisions at $\sqrt{s}=13$ TeV.

arXiv comment31 pages, 10 captioned figures, 6 tables, authors from page 25, published version, figures at http://alice-publications.web.cern.ch/node/9594

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