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Multiplicity-dependent production of $Σ(1385)^{\pm}$ and $Ξ(1530)^{0}$ in pp collisions at $\sqrt{s}=13$ TeV (2308.16116v2)

Published 30 Aug 2023 in nucl-ex and hep-ex

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 $\langle \mathrm{d}N_\mathrm{ch}/\mathrm{d}\eta \rangle$, which is related to the energy density produced in the collision. The results include transverse momentum ($p_{\rm T}$) distributions, $p_{\rm T}$-integrated yields, mean transverse momenta of $\Sigma(1385){\pm}$ and $\Xi(1530){0}$, as well as ratios of the $p_{\rm T}$-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.

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