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

Deryk Anderson , Xin-Nan Chen , Xin-Nan Chen , J Cheng , Martin Girard , Y. Guo , Wei-Te Huang , Hong-Zhong HUANG , Daniel Kikoła , Adam Kisiel , Leszek Kosarzewski , W. Li , Fengwei Liu , Pengfei Liu , Lin Ma , Mayer J. R. R. , A. M. Mustafa Al Bakri , Bernd Page , Jan Pluta , Katarzyna Poniatowska , Joanna Porter-Sobieraj , J. Schambach , R Sikora , S. Tripathy , Barbara Trzeciak , J. W. Xu , Cheng-Zhong Xu , S. Yang , Wuqiang Q Yang , Hanna Zbroszczyk , Jian Zhang , Jian Zhang , Jian Zhang , J Zhao , X. Zhu

Abstract

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.
Collective authorL. Adamczyk, J.R. Adams, J.K. Adkins, G. Agakishiev, M.M. Aggarwal, Z. Ahammed, N.N. Ajita.....
Author Deryk Anderson - [Texas A and M University]
Deryk Anderson ,,
-
-
, Xin-Nan Chen
Xin-Nan Chen,,
-
, Xin-Nan Chen
Xin-Nan Chen,,
-
, J Cheng - [Tsinghua University]
J Cheng,,
-
-
, Martin Girard (FP / NPD)
Martin Girard,,
- Nuclear Physics Division
, Y. Guo - [Kent State University]
Y. Guo,,
-
-
, Wei-Te Huang
Wei-Te Huang,,
-
, Hong-Zhong HUANG - [University of California, Los Angeles]
Hong-Zhong HUANG ,,
-
-
, Daniel Kikoła (FP / NPD)
Daniel Kikoła,,
- Nuclear Physics Division
, Adam Kisiel (FP / NPD)
Adam Kisiel,,
- Nuclear Physics Division
et al.`
Total number of authors351
Journal seriesPhysical Review C, ISSN 2469-9985, e-ISSN 2469-9993 [1538-4497], (A 45 pkt)
Issue year2018
Vol97
No5
ASJC Classification3106 Nuclear and High Energy Physics
DOIDOI:10.1103/PhysRevC.97.054909
Languageen angielski
Score (nominal)45
ScoreMinisterial score = 35.0, 18-04-2019, ArticleFromJournal
Ministerial score (2013-2016) = 45.0, 18-04-2019, ArticleFromJournal
Publication indicators Scopus Citations = 6; WoS Citations = 5; WoS Impact Factor: 2017 = 3.304 (2) - 2017=3.106 (5)
Citation count*
Cite
Share Share

Get link to the record


* presented citation count is obtained through Internet information analysis and it is close to the number calculated by the Publish or Perish system.
Back