Skip to main content
eScholarship
Open Access Publications from the University of California

Measurement of the H Λ3 lifetime in Au+Au collisions at the BNL Relativistic Heavy Ion Collider

  • Author(s): Adamczyk, L
  • Adams, JR
  • Adkins, JK
  • Agakishiev, G
  • Aggarwal, MM
  • Ahammed, Z
  • Ajitanand, NN
  • Alekseev, I
  • Alford, J
  • Anderson, DM
  • Aoyama, R
  • Aparin, A
  • Arkhipkin, D
  • Aschenauer, EC
  • Ashraf, MU
  • Attri, A
  • Averichev, GS
  • Bai, X
  • Bairathi, V
  • Barish, K
  • Behera, A
  • Bellwied, R
  • Bhasin, A
  • Bhati, AK
  • Bhattarai, P
  • Bielcik, J
  • Bielcikova, J
  • Bland, LC
  • Bordyuzhin, IG
  • Bouchet, J
  • Brandenburg, JD
  • Brandin, AV
  • Brown, D
  • Bryslawskyj, J
  • Bunzarov, I
  • Butterworth, J
  • Caines, H
  • Calderón De La Barca Sánchez, M
  • Campbell, JM
  • Cebra, D
  • Chakaberia, I
  • Chaloupka, P
  • Chang, Z
  • Chankova-Bunzarova, N
  • Chatterjee, A
  • Chattopadhyay, S
  • Chen, X
  • Chen, X
  • Chen, JH
  • Cheng, J
  • Cherney, M
  • Christie, W
  • Contin, G
  • Crawford, HJ
  • Das, S
  • Dedovich, TG
  • Deng, J
  • Deppner, IM
  • Derevschikov, AA
  • Didenko, L
  • Dilks, C
  • Dong, X
  • Drachenberg, JL
  • Draper, JE
  • Dunlop, JC
  • Efimov, LG
  • Elsey, N
  • Engelage, J
  • Eppley, G
  • Esha, R
  • Esumi, S
  • Evdokimov, O
  • Ewigleben, J
  • Eyser, O
  • Fatemi, R
  • Fazio, S
  • Federic, P
  • Federicova, P
  • Fedorisin, J
  • Feng, Z
  • Filip, P
  • Finch, E
  • Fisyak, Y
  • Flores, CE
  • Fujita, J
  • Fulek, L
  • Gagliardi, CA
  • Geurts, F
  • Gibson, A
  • Girard, M
  • Grosnick, D
  • Gunarathne, DS
  • Guo, Y
  • Gupta, A
  • Guryn, W
  • Hamad, AI
  • Hamed, A
  • Harlenderova, A
  • Harris, JW
  • et al.
Abstract

© 2018 American Physical Society. An improved measurement of the HΛ3 lifetime is presented. In this paper, the mesonic decay modes HΛ3→He3 + π- and HΛ3→d+p+π- are used to reconstruct the HΛ3 from Au+Au collision data collected by the STAR collaboration at Relativistic Heavy Ion Collider (RHIC). A minimum χ2 estimation is used to determine the lifetime of τ=142-21+24(stat.)±29(syst.) ps. This lifetime is about 50% shorter than the lifetime τ=263±2 ps of a free Λ, indicating strong hyperon-nucleon interaction in the hypernucleus system. The branching ratios of the mesonic decay channels are also determined to satisfy B.R.(He3+π-)/(B.R.(He3+π-)+B.R.(d+p+π-))=0.32±0.05(stat.)±0.08(syst.). Our ratio result favors the assignment J(HΛ3)=12 over J(HΛ3)=32. These measurements will help to constrain models of hyperon-baryon interactions.

Main Content
Current View