Measurement of the [lambda]3H lifetime in Au+Au collisions at the BNL relativistic heavy ion collider
An improved measurement of the 3ΛH lifetime is presented. In this paper, the mesonic decay modes 3ΛH→3He + π− and 3ΛH→d+p+π− are used to reconstruct the 3ΛH from Au+Au collision data collected by the STAR collaboration at Relativistic Heavy Ion Collider (RHIC). A minimum χ2 estimation is used to det...
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| Main Authors: | , , |
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| Corporate Author: | |
| Format: | Article (Journal) |
| Language: | English |
| Published: |
22 May 2018
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| In: |
Physical review
Year: 2018, Volume: 97, Issue: 5 |
| ISSN: | 2469-9993 |
| DOI: | 10.1103/PhysRevC.97.054909 |
| Online Access: | Verlag, Volltext: https://doi.org/10.1103/PhysRevC.97.054909 Verlag, Volltext: https://link.aps.org/doi/10.1103/PhysRevC.97.054909 
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| Author Notes: | L. Adamczyk, I.M. Deppner, N. Herrmann [und 347 weitere] (STAR Collaboration) |
MARC
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| 246 | 3 | 3 | |a Measurement of the lambda 3 H lifetime in Au + Au collisions at the BNL relativistic heavy ion collider |
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| 520 | |a An improved measurement of the 3ΛH lifetime is presented. In this paper, the mesonic decay modes 3ΛH→3He + π− and 3ΛH→d+p+π− are used to reconstruct the 3ΛH 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+24−21(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.(3He+π−)/(B.R.(3He+π−)+B.R.(d+p+π−))=0.32±0.05(stat.)±0.08(syst.). Our ratio result favors the assignment J(3ΛH)=12 over J(3ΛH)=32. These measurements will help to constrain models of hyperon-baryon interactions. | ||
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