PoS - Proceedings of Science
Volume 390 - 40th International Conference on High Energy physics (ICHEP2020) - Parallel: Strong Interactions and Hadron Physics
Investigating the hyperon-nucleon strong interaction with a precision measurement of the hypertriton lifetime in ALICE
F. Mazzaschi
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Abstract
The hypertriton is a bound state of a proton, a neutron and a Λ baryon. Studying its internal
structure is crucial to investigate the hyperon–nucleon strong interaction and offers insights into
the inner core of neutron stars, where Λ production is favoured. One powerful way to investigate
the hypertriton’s internal structure is to measure precisely its lifetime. The hypertriton is an
extremely loosely bound object with a lambda separation energy E_Λ of only 130 keV. Therefore
the hypertriton lifetime is expected to be close to the one of the free Λ. Thanks to the very large
set of Pb–Pb collision data collected during LHC Run 2, the ALICE collaboration has performed
systematic studies on the hypertriton lifetime. The hypertriton 2-body mesonic decay channel has
been studied with the help of machine learning techniques for the signal extraction. The precision
of the new ALICE results on the hypertriton lifetime is comparable with the current world average
and the measured lifetime value confirms the weakly-bound nature of the hypertriton.
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