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Measurement of the H Λ3 lifetime in Au+Au collisions at the BNL Relativistic Heavy Ion Collider

Adamczyk, L.
•
Adams, J. R.
•
Adkins, J. K.
altro
Zyzak, M.
2018
  • journal article

Periodico
PHYSICAL REVIEW C
Abstract
An improved measurement of the HΛ3 lifetime is presented. In this paper, the mesonic decay modes HΛ3→He3 + π− and HΛ3→d+p+π− are used to reconstruct the HΛ3 from Au+Au collision data collected by the STAR collaboration at Relativistic Heavy Ion Collider (RHIC). A minimum χ2 estimation is used to determine the lifetime of τ=142−21+24(stat.)±29(syst.) ps. This lifetime is about 50% shorter than the lifetime τ=263±2 ps of a free Λ, indicating strong hyperon-nucleon interaction in the hypernucleus system. The branching ratios of the mesonic decay channels are also determined to satisfy B.R.(He3+π−)/(B.R.(He3+π−)+B.R.(d+p+π−))=0.32±0.05(stat.)±0.08(syst.). Our ratio result favors the assignment J(HΛ3)=12 over J(HΛ3)=32. These measurements will help to constrain models of hyperon-baryon interactions.
DOI
10.1103/PhysRevC.97.054909
WOS
WOS:000433031700005
Archivio
http://hdl.handle.net/11368/2941638
info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-85047738850
http://harvest.aps.org/v2/bagit/articles/10.1103/PhysRevC.97.054909/apsxml
Diritti
closed access
license:copyright editore
FVG url
https://arts.units.it/request-item?handle=11368/2941638
Soggetti
  • Nuclear and High Ener...

  • hypernuclei

  • heavy ion

  • RHIC

  • STAR

Web of Science© citazioni
48
Data di acquisizione
Mar 27, 2024
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