The production yields of the Sigma(1385)(+/-) and.(1530)(0) resonances are measured in pp collisions at root s = 13TeV with ALICE. The measurements are performed as a function of the charged-particle multiplicity dN(ch)/d eta , which is related to the energy density produced in the collision. The results include transverse momentum (p(T)) distributions, p(T)-integrated yields, mean transverse momenta of Sigma(1385)(+/-) and.(1530)(0), as well as ratios of the p(T)-integrated resonance yields relative to yields of other hadron species. The Sigma(1385)(+/-)/pi(+/-) and Xi(1530)(0)/ pi(+/-) 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)(+/-) and Xi(1530)(0) production in pp collisions at root s = 13TeV.
Multiplicity-dependent production of Σ(1385)± and Ξ(1530)0 in pp collisions at sqrt(s) = 13 TeV
Barbera, R.;La Rocca, P.;Rasa, M.;
2024-01-01
Abstract
The production yields of the Sigma(1385)(+/-) and.(1530)(0) resonances are measured in pp collisions at root s = 13TeV with ALICE. The measurements are performed as a function of the charged-particle multiplicity dN(ch)/d eta , which is related to the energy density produced in the collision. The results include transverse momentum (p(T)) distributions, p(T)-integrated yields, mean transverse momenta of Sigma(1385)(+/-) and.(1530)(0), as well as ratios of the p(T)-integrated resonance yields relative to yields of other hadron species. The Sigma(1385)(+/-)/pi(+/-) and Xi(1530)(0)/ pi(+/-) 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)(+/-) and Xi(1530)(0) production in pp collisions at root s = 13TeV.File | Dimensione | Formato | |
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