TY - JOUR
T1 - Towards resolving the Λ 3 H lifetime puzzle
AU - Gal, A.
AU - Garcilazo, H.
N1 - Publisher Copyright:
© 2019 The Author(s)
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.
KW - Faddeev calculations
KW - Hypertriton lifetime
KW - Light Λ hypernuclei
UR - http://www.scopus.com/inward/record.url?scp=85061837138&partnerID=8YFLogxK
U2 - 10.1016/j.physletb.2019.02.014
DO - 10.1016/j.physletb.2019.02.014
M3 - Artículo
SN - 0370-2693
VL - 791
SP - 48
EP - 53
JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
ER -