Towards resolving the                          Λ                                                                              3                         H lifetime puzzle

A. Gal; H. Garcilazo

doi:10.1016/j.physletb.2019.02.014

Towards resolving the _Λ ³ H lifetime puzzle

A. Gal^*
, H. Garcilazo

^*Corresponding author for this work

Racah Institute of Physics

Research output: Contribution to journal › Article › peer-review

28 Scopus citations

Abstract

Recent _Λ ³ H lifetime measurements in relativistic heavy ion collision experiments have yielded values shorter by (30±8)% than the free Λ lifetime τ _Λ , thereby questioning the naive expectation τ(HΛ3)≈τ _Λ for a weakly bound Λ hyperon. Here we apply the closure approximation introduced by Dalitz and coworkers to evaluate the _Λ ³ H lifetime, using _Λ ³ H wavefunctions generated by solving three-body Faddeev equations. Our result, disregarding pion final-state interaction (FSI), is τ(HΛ3)=(0.90±0.01)τ _Λ . In contrast to previous works, pion FSI is found attractive, reducing further τ(HΛ3) to τ(HΛ3)=(0.81±0.02)τ _Λ . We also evaluate for the first time τ(nΛ3), finding it considerably longer than τ _Λ , contrary to the shorter lifetime values suggested by the GSI HypHI experiment for this controversial hypernucleus.

Original language	English
Pages (from-to)	48-53
Number of pages	6
Journal	Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume	791
DOIs	https://doi.org/10.1016/j.physletb.2019.02.014
State	Published - 10 Apr 2019

Bibliographical note

Publisher Copyright:
© 2019 The Author(s)

Keywords

Faddeev calculations
Hypertriton lifetime
Light Λ hypernuclei

Access to Document

10.1016/j.physletb.2019.02.014

Cite this

Gal, A., & Garcilazo, H. (2019). Towards resolving the _Λ ³ H lifetime puzzle Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 791, 48-53. https://doi.org/10.1016/j.physletb.2019.02.014

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title = " Towards resolving the Λ 3 H lifetime puzzle ",

abstract = " Recent Λ 3 H lifetime measurements in relativistic heavy ion collision experiments have yielded values shorter by (30±8)\% than the free Λ lifetime τ Λ , thereby questioning the naive expectation τ(HΛ3)≈τ Λ for a weakly bound Λ hyperon. Here we apply the closure approximation introduced by Dalitz and coworkers to evaluate the Λ 3 H lifetime, using Λ 3 H wavefunctions generated by solving three-body Faddeev equations. Our result, disregarding pion final-state interaction (FSI), is τ(HΛ3)=(0.90±0.01)τ Λ . In contrast to previous works, pion FSI is found attractive, reducing further τ(HΛ3) to τ(HΛ3)=(0.81±0.02)τ Λ . We also evaluate for the first time τ(nΛ3), finding it considerably longer than τ Λ , contrary to the shorter lifetime values suggested by the GSI HypHI experiment for this controversial hypernucleus.",

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Gal, A & Garcilazo, H 2019, ' Towards resolving the _Λ ³ H lifetime puzzle ', Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, vol. 791, pp. 48-53. https://doi.org/10.1016/j.physletb.2019.02.014

Towards resolving the _Λ ³ H lifetime puzzle . / Gal, A.; Garcilazo, H.
In: Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, Vol. 791, 10.04.2019, p. 48-53.

Research output: Contribution to journal › Article › peer-review

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AU - Gal, A.

AU - Garcilazo, H.

PY - 2019/4/10

Y1 - 2019/4/10

N2 - Recent Λ 3 H lifetime measurements in relativistic heavy ion collision experiments have yielded values shorter by (30±8)% than the free Λ lifetime τ Λ , thereby questioning the naive expectation τ(HΛ3)≈τ Λ for a weakly bound Λ hyperon. Here we apply the closure approximation introduced by Dalitz and coworkers to evaluate the Λ 3 H lifetime, using Λ 3 H wavefunctions generated by solving three-body Faddeev equations. Our result, disregarding pion final-state interaction (FSI), is τ(HΛ3)=(0.90±0.01)τ Λ . In contrast to previous works, pion FSI is found attractive, reducing further τ(HΛ3) to τ(HΛ3)=(0.81±0.02)τ Λ . We also evaluate for the first time τ(nΛ3), finding it considerably longer than τ Λ , contrary to the shorter lifetime values suggested by the GSI HypHI experiment for this controversial hypernucleus.

AB - Recent Λ 3 H lifetime measurements in relativistic heavy ion collision experiments have yielded values shorter by (30±8)% than the free Λ lifetime τ Λ , thereby questioning the naive expectation τ(HΛ3)≈τ Λ for a weakly bound Λ hyperon. Here we apply the closure approximation introduced by Dalitz and coworkers to evaluate the Λ 3 H lifetime, using Λ 3 H wavefunctions generated by solving three-body Faddeev equations. Our result, disregarding pion final-state interaction (FSI), is τ(HΛ3)=(0.90±0.01)τ Λ . In contrast to previous works, pion FSI is found attractive, reducing further τ(HΛ3) to τ(HΛ3)=(0.81±0.02)τ Λ . We also evaluate for the first time τ(nΛ3), finding it considerably longer than τ Λ , contrary to the shorter lifetime values suggested by the GSI HypHI experiment for this controversial hypernucleus.

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Gal A, Garcilazo H. Towards resolving the _Λ ³ H lifetime puzzle Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics. 2019 Apr 10;791:48-53. doi: 10.1016/j.physletb.2019.02.014