Measurement of the 3ΛH lifetime in Au+Au collisions at the BNL relativistic heavy ion collider. STAR Collaboration Physical Review C, 97(5):054909, May, 2018. Finch
Measurement of the 3ΛH lifetime in Au+Au collisions at the BNL relativistic heavy ion collider [link]Paper  doi  abstract   bibtex   
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.
@article{star_collaboration_measurement_2018,
	title = {Measurement of the 3{ΛH} lifetime in {Au}+{Au} collisions at the {BNL} relativistic heavy ion collider},
	volume = {97},
	url = {https://link.aps.org/doi/10.1103/PhysRevC.97.054909},
	doi = {10.1103/PhysRevC.97.054909},
	abstract = {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.},
	number = {5},
	urldate = {2019-10-07},
	journal = {Physical Review C},
	author = {{STAR Collaboration}},
	month = may,
	year = {2018},
	note = {Finch},
	pages = {054909}
}

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