Measurement of the Lifetime and Λ Separation Energy of 3ΛH

作者：Acharya, S.; Adamova, D.; Adler, A.; Rinella, G. Aglieri; Agnello, M.; Agrawal, N.; Ahammed, Z.; Ahmad, S.; Ahn, S. U.; Ahuja, I.; Akindinov, A.; Al-Turany, M.; Aleksandrov, D.; Alessandro, B.; Alfanda, H. M.; Alfaro Molina, R.; Ali, B.; Ali, Y.; Alici, A.; Alizadehvandchali, N.; Alkin, A.; Alme, J.; Alocco, G.; Alt, T.; Altsybeev, I.; Anaam, M. N.; Andrei, C.; Andronic, A.; Anguelov, V.; Antinori, F.; Antonioli, P.; Anuj, C.; Apadula, N.; Aphecetche, L.; Appelshaeuser, H.; Arcelli, S.

来源：Physical Review Letters, 2023, 131(10): 102302.

DOI：10.1103/PhysRevLett.131.102302

• PB-PB COLLISIONS
• BINDING
• VALUES
• HYPERNUCLEI
• NUCLEI
• MODEL
• PP

The most precise measurements to date of the 3AH lifetime z and A separation energy BA are obtained using the data sample of Pb-Pb collisions at ffiffiffiffiffiffiffi = 5.02 TeV collected by ALICE at the LHC. The 3 sNNAH is reconstructed via its charged two-body mesonic decay channel (3AH -> 3He + x-- and the charge-conjugate process). The measured values z = [253 1 11(stat) 1 6(syst)] ps and BA = [102 1 63(stat) 1 67(syst)] keV are compatible with predictions from effective field theories and confirm that the 3AH structure is consistent with a weakly bound system.