Measurement of the HΛ3 lifetime in Au+Au collisions at the BNL Relativistic Heavy Ion Collider

L. Adamczyk et al. (STAR Collaboration)
Phys. Rev. C 97, 054909 – Published 22 May 2018

Abstract

An improved measurement of the HΛ3 lifetime is presented. In this paper, the mesonic decay modes HΛ3He3 + π and HΛ3d+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=14221+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.

  • Figure
  • Figure
  • Figure
  • Figure
  • Received 3 October 2017
  • Revised 11 February 2018

DOI:https://doi.org/10.1103/PhysRevC.97.054909

©2018 American Physical Society

Physics Subject Headings (PhySH)

Nuclear Physics

Authors & Affiliations

Click to Expand

Article Text (Subscription Required)

Click to Expand

References (Subscription Required)

Click to Expand
Issue

Vol. 97, Iss. 5 — May 2018

Reuse & Permissions
Access Options
CHORUS

Article Available via CHORUS

Download Accepted Manuscript
Author publication services for translation and copyediting assistance advertisement

Authorization Required


×
×

Images

×

Sign up to receive regular email alerts from Physical Review C

Log In

Cancel
×

Search


Article Lookup

Paste a citation or DOI

Enter a citation
×