The decay rate of3HΛ

Mansour, Hesham; Higgins, Kelly J.

doi:10.1007/bf02775419

Cited by 12 publications

(6 citation statements)

References 20 publications

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“…At the same time calculations were done connecting the experimental information of the binding energy E B , or better the separation energy of the Λ B Λ being only about 130 keV [192], and the expected lifetime. The theoretical predictions [193,194,195,196,197,198,199,200,201] span a range of 0.7 × τ Λ to 0.97 × τ Λ . The latter value is the most recent calculation by Kamada et al [201].…”

Section: Hypertriton Lifetimementioning

confidence: 97%

Loosely-bound objects produced in nuclear collisions at the LHC

2019

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Loosely-bound objects such as light nuclei are copiously produced in proton-proton and nuclear collisions at the Large Hadron Collider (LHC), despite the fact that typical energy scales in such collisions exceed the binding energy of the objects by orders of magnitude. In this review we summarise the experimental observations, put them into context of previous studies at lower energies, and discuss the underlying physics. Most of the data discussed here were taken by the ALICE Collaboration during LHC Run1, which started in 2009 and ended in 2013. Specifically we focus on the production of (anti-)nuclei and (anti-)hypernuclei. Also included are searches for exotic objects like the H-dibaryon, a possible uuddss hexaquark state, or also a possible bound state of a Λ hyperon and a neutron. Furthermore, the study of hyperon-nucleon and hyperonhyperon interactions through measurements of correlations are briefly discussed, especially in connection with the possible existence of loosely-bound states composed of these baryons. In addition, some results in the strange and charmed hadron sector are presented, to show the capabilities for future measurements on loosely-bound objects in this direction. Finally, perspectives are given for measurements in the currently ongoing Run2 period of the LHC and in the future LHC Run3.

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Section: Hypertriton Lifetimementioning

confidence: 97%

Loosely-bound objects produced in nuclear collisions at the LHC

2019

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“…Among calculations that claim much shorter 3 Λ H lifetimes, we were unable to reproduce the results of Ref. [19], nor to make sense out of a 3 Λ H decay rate calculation based on a nonmesonic ΛN → NN weak interaction hamiltonian [20]. We comment briefly on the calculations in Refs.…”

Section: Introductionmentioning

confidence: 93%

Towards resolving the Λ3H lifetime puzzle

Gal

Garcilazo

2019

Physics Letters B

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Recent 3 Λ 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 that τ ( 3 Λ H) ≈ τ Λ for a weakly bound Λ hyperon. Here we apply the closure approximation introduced by Dalitz and coworkers to evaluate the 3 Λ H lifetime, using 3 Λ H wavefunctions generated by solving three-body Faddeev equations. Our result, disregarding pion final-state interaction (FSI), is τ ( 3 Λ H)=(0.90±0.01)τ Λ . In contrast to previous works, pion FSI is found attractive, reducing further τ ( 3 Λ H) to τ ( 3 Λ H)=(0.81±0.02)τ Λ . We also evaluate for the first time τ ( 3 Λ n), 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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“…It is consistent with the previous measurements performed by ALICE and with the theoretical models that assume a weakly bound system. On the contrary, models assuming a compact hypertriton such as [14] are disfavoured by this measurement.…”

Section: Francesco Mazzaschimentioning

confidence: 83%