Revisiting the hypertriton lifetime puzzle

Progress report on few-body hypernuclei

“…In contrast, the two works listed in the lower part of the table suggest 3 Λ H lifetimes shorter than τ Λ by more than 20%, owing primarily to πFSI where outgoing-pion plane waves are superseded by realistic pion distorted waves. This enhances Γ( 3 Λ H) by about 10% [16], or more realistically by 15% [18]. It looks like these two recent 3 Λ H lifetime calculations get further away from τ Λ , in contrast to the most recently measured 3 Λ H lifetimes [11,12] that come close to τ Λ .…”

“…This amounts to slightly varying the πEFT short-range input. The resulting B Λ dependence of the computed two-body decay rate Γ( 3 Λ H→ 3 He+π − ) is satisfied by the blue points, all for Λ UV =1200 MeV, obtained by varying systematically within allowed uncertainties some of the NN and YN chiral fit data [19]. Of the three red points, the middle one is that highlighted in Table 1 [11,12].…”

“…In most calculations the B Λ dependence of τ( 3 Λ H) is weak, the most striking manifestation of which is provided by the almost B Λ -independent lifetime calculated in / πEFT [17]. In contrast, the πEFT lifetime calculation [18] produces a strong B Λ dependence, as shown in Fig. 1.…”

“…Recent measurements of τ( 3 Λ H) in relativistic heavy ion collision experiments renewed interest in the 3 Λ H lifetime problem. The first round of results from STAR [7] and ALICE [8] RD (1966) [13] closure-Λpn no -1.14 Congleton (1992) [14] closure-Λd no 0.33±0.02 1.15 Kamada (1998) [15] Faddeev-Λpn no 0.379 1.06 GG (2019) [16] closure-Faddeev-Λpn no 0.362 1.11±0.01 HH (2020) [17] / πEFT(LO)-Λd no 0.37±0.05 0.98±0.15 GG (2019) [16] closure-Faddeev-Λpn yes 0.357 1.23±0.02 POGFG (2020) [18] πEFT ) lifetime calculations assembled in Table 1. Its upper part lists works that disregard pion final-state interaction (πFSI).…”

Dynamics of light hypernuclei in collisions of $$^{197}$$Au+$$^{197}$$Au at GeV energies

“…Inclusion of the strangeness degree of freedom in nuclear matter and in a nucleus extends the research activities, in particular on the issues of the nuclear structure of hypernucleus and kaonic nucleus, hyperon-nucleon and hyperon-hyperon interactions, probing the in-medium properties of hadrons [25]. Recently, the hypertriton lifetime puzzle is investigated by using the three-body wave functions generated in a chiral effective field theory approach [26]. Moreover, hadrons with strangeness as essential ingredients influence the high-density nuclear EOS.…”