Measurement of the lifetime in Au+Au collisions at the BNL Relativistic Heavy Ion Collider [Measurement of the lifetime in Au+Au collisions at the Relativistic Heavy Ion Collider]
Here, an improved measurement of the 3ΛH lifetime is presented. In this paper, the mesonic decay modes 3ΛH → 3He + π– and 3ΛH → d + p + π– are used to reconstruct the 3ΛH 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+24–21 (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.(3He+π–)/(B.R.(3He+π–) + B.R.(d+p+π–)) = 0.32 ± 0.05 (stat.) ± 0.08 (syst.). Our ratio result favors the assignment J(3ΛH) = 1/2 over J(3ΛH) = 3/2. These measurements will help to constrain models of hyperon-baryon interactions.
- Research Organization:
- Brookhaven National Laboratory (BNL), Upton, NY (United States); University of Illinois, Chicago, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Nuclear Physics (NP); USDOE
- Contributing Organization:
- STAR Collaboration
- Grant/Contract Number:
- SC0012704; FG02-94ER40865
- OSTI ID:
- 1460833
- Alternate ID(s):
- OSTI ID: 1438276; OSTI ID: 1665949
- Report Number(s):
- BNL-207850-2018-JAAM; DOE-UIC-ER40865-X16; PRVCAN; TRN: US1901928
- Journal Information:
- Physical Review. C, Vol. 97, Issue 5; ISSN 2469-9985
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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