Measurements of .sup.3./sup..sub.Λ./sub.H and .sup.4./sup..sub.Λ./sub.H Lifetimes and Yields in Au + Au Collisions in the High Baryon Density Region

0558720 - ÚJF 2023 RIV US eng J - Journal Article
Abdallah, M. S. - Aboona, B. E. - Adam, J. - Adamczyk, L. - Bielčík, J. - Bielčíková, Jana - Federič, Pavol - Holub, P. - Chaloupka, P. - Kosarzewski, L. K. - Kramárik, L. - Líčeník, Robert - Ponimatkin, Georgij - Prozorova, V. - Robotková, Monika - Rusňák, Jan - Šimko, Miroslav - Šumbera, Michal - Truhlář, T. - Trzeciak, B. A. - Vaněk, Jan … Total 390 authors
Measurements of ³_ΛH and ⁴_ΛH Lifetimes and Yields in Au + Au Collisions in the High Baryon Density Region.
Physical Review Letters. Roč. 128, č. 20 (2022), č. článku 202301. ISSN 0031-9007. E-ISSN 1079-7114
R&D Projects: GA MŠMT LTT18002
Research Infrastructure: BNL-CZ II - 90109
Institutional support: RVO:61389005
Keywords : STAR experiment * heavy ion collisions
OECD category: Particles and field physics
Impact factor: 8.6, year: 2022
Method of publishing: Limited access
https://doi.org/10.1103/PhysRevLett.128.202301

We report precision measurements of hypernuclei H-3(Lambda) and H-4(Lambda) lifetimes obtained from Au + Au collisions at root s(NN) = 3.0 GeV and 7.2 GeV collected by the STAR experiment at the Relativistic Heavy Ion Collider, and the first measurement of H-3(Lambda) and H-4(Lambda) midrapidity yields in Au + Au collisions at root s(NN) = 3.0 GeV. H-3(Lambda) and H-4(Lambda), being the two simplest bound states composed of hyperons and nucleons, are cornerstones in the field of hypernuclear physics. Their lifetimes are measured to be 221 +/- 15(stat) +/- 19(syst) ps for H-3(Lambda) and 218 +/- 6(stat) +/- 13(syst) ps for H-4(Lambda). The p(T)-integrated yields of H-3(Lambda) and H-4(Lambda) are presented in different centrality and rapidity intervals. It is observed that the shape of the rapidity distribution of H-4(Lambda) is different for 0%-10% and 10%-50% centrality collisions. Thermal model calculations, using the canonical ensemble for strangeness, describes the H-3(Lambda) yield well, while underestimating the H-4(Lambda) yield. Transport models, combining baryonic mean-field and coalescence (JAM) or utilizing dynamical cluster formation via baryonic interactions (PHQMD) for light nuclei and hypernuclei production, approximately describe the measured H-3(Lambda) and H-4(Lambda) yields. Our measurements provide means to precisely assess our understanding of the fundamental baryonic interactions with strange quarks, which can impact our understanding of more complicated systems involving hyperons, such as the interior of neutron stars or exotic hypernuclei.
Permanent Link: http://hdl.handle.net/11104/0332290