Measurements of 3ΛH and 4ΛH Lifetimes and Yields in Au + Au Collisions in the High Baryon Density Region

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389005%3A_____%2F22%3A00558720" target="_blank" >RIV/61389005:_____/22:00558720 - isvavai.cz</a>

Result on the web

<a href="https://doi.org/10.1103/PhysRevLett.128.202301" target="_blank" >https://doi.org/10.1103/PhysRevLett.128.202301</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1103/PhysRevLett.128.202301" target="_blank" >10.1103/PhysRevLett.128.202301</a>

Result language

angličtina

Original language name

Measurements of 3ΛH and 4ΛH Lifetimes and Yields in Au + Au Collisions in the High Baryon Density Region

Original language description

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.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

10303 - Particles and field physics

Project

<a href="/en/project/LTT18002" target="_blank" >LTT18002: Study of new properties of nuclear matter in the international experiment STAR</a><br>

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2022

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Physical Review Letters

ISSN

0031-9007

e-ISSN

1079-7114

Volume of the periodical

128

Issue of the periodical within the volume

20

Country of publishing house

US - UNITED STATES

Number of pages

8

Pages from-to

202301

UT code for WoS article

000808427700012

EID of the result in the Scopus database

2-s2.0-85131460689