EPJ Web Conf.
Volume 271, 2022HYP2022 - 14th International Conference on Hypernuclear and Strange Particle Physics
|Number of page(s)||8|
|Section||Production, Structure and Decay of S=-1 Hypernuclei|
|Published online||09 November 2022|
Lifetime of the hypertriton
1 Nuclear Physics Institute, 25068 Řež, Czech Republic
2 Barcelona Supercomputing Center, 08034 Barcelona, Spain
3 Racah Institute of Physics, The Hebrew University, Jerusalem 91904, Israel
* e-mail: email@example.com
Published online: 9 November 2022
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 , 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).
© The Authors, published by EDP Sciences, 2022
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