Number of the records: 1
Lifetime of the hypertriton
- 1.
SYSNO ASEP 0568498 Document Type C - Proceedings Paper (int. conf.) R&D Document Type Conference Paper Title Lifetime of the hypertriton Author(s) Gazda, Daniel (UJF-V) RID, ORCID, SAI
Pérez-Obiol, A. (ES)
Gal, A. (IL)
Friedman, E. (IL)Number of authors 4 Article number 01002 Source Title EPJ Web of Conferences, HYP2022, 271. - Les Ulis : EDP Science, 2022 Number of pages 8 s. Publication form Online - E Action 14th International Conference on Hypernuclear and Strange Particle Physics (HYP2022) Event date 27.06.2022 - 01.07.2022 VEvent location Prague Country CZ - Czech Republic Event type WRD Language eng - English Country FR - France Keywords relativistic heavy ion collision ; hypertrion lifetime OECD category Nuclear physics R&D Projects GA19-19640S GA ČR - Czech Science Foundation (CSF) GA22-14497S GA ČR - Czech Science Foundation (CSF) Research Infrastructure e-INFRA CZ - 90140 - CESNET, zájmové sdružení právnických osob Institutional support UJF-V - RVO:61389005 DOI 10.1051/epjconf/202227101002 Annotation Conflicting values of the hypertriton lifetime τ(3ΛH) were derived in relativistic heavy ion (RHI) collision experiments over the last decade. A very recent ALICE Collaboration measurement is the only experiment where the reported τ(3ΛH) comes sufficiently close to the free-Λ lifetime τΛ, as expected naively for a very weakly bound Λ in 3ΛH. We revisited theoretically this 3ΛH lifetime puzzle [1], using 3ΛH and 3He wave functions computed within the ab initio no-core shell model employing interactions derived from chiral effective field theory to calculate the two-body decay rate Γ(3ΛH → 3He + π−). We found significant but opposing contributions arising from ΣNN admixtures in 3ΛH and from π− − 3He final-state interaction. To derive τ(3ΛH), we evaluated the inclusive π− decay rate Γπ− (3ΛH) by using the measured branching ratio Γ(3ΛH → 3He + π−)/Γπ− (3ΛH) and added the π0 contributions through the ΔI = 1/2rule. The resulting τ(3ΛH) varies strongly with the rather poorly known Λ separation energy Esep(3ΛH) and it is thus possible to associate each one of the distinct RHI τ(3ΛH) measurements with its own underlying value of Esep(3ΛH). Workplace Nuclear Physics Institute Contact Markéta Sommerová, sommerova@ujf.cas.cz, Tel.: 266 173 228 Year of Publishing 2023
Number of the records: 1