On the measured lifetime of light hypernuclei 3ΛH and 4ΛH

Rappold, C.; Saito, Takehiko; Bertini, O.; Bianchin, S.; Bozkurt, V.; Kavatsyuk, M.; Kim, E.; Ma, Yue; Maas, F. E.; Minami, S.; Nakajima, D.; Özel-Tashenov, B.; Yoshida, K.

doi:10.1016/j.physletb.2013.12.037

Cited by 35 publications

(36 citation statements)

References 24 publications

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“…Since 2010, there are several new measurements from STAR [8], GSI [17] and ALICE [18]. Their results are consistent with each other and all show a shorter lifetime than the free Λ. Saito and his colleagues have carried out a statistical combination of the available lifetime measurements and concluded that the lifetime of 3 Λ H could be shorter than the Λ's [19]. Our measurement indicates that the interaction between a Λ and a neutron may be stronger than expected [4] and further theoretical study is required.…”

Section: Discussion and Summarymentioning

confidence: 69%

Measurement of Hypertriton Lifetime at STAR

Xu¹

2017

Proceedings of the 12th International Conference on Hypernuclear and Strange Particle Physics (HYP2015)

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Section: Discussion and Summarymentioning

confidence: 69%

Measurement of Hypertriton Lifetime at STAR

Xu¹

2017

Proceedings of the 12th International Conference on Hypernuclear and Strange Particle Physics (HYP2015)

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“…) ps has been obtained, as reported in Figure 2, where the ALICE measurement is compared to the previous results. Our result was included in the world-average that has been re-evaluated by using the procedure described in [37]. The resulting value, τ = ( 215 +18 −16 ps ) , is shown as a yellow band in Figure 2.…”

Section: −18mentioning

confidence: 99%

Production of (Anti-)(Hyper)nuclei in Pb–Pb Collisions Measured with ALICE at the LHC

Piano¹

2017

Proceedings of the 12th International Conference on Hypernuclear and Strange Particle Physics (HYP2015)

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In high-energy heavy-ion collisions nuclei and hypernuclei emerge from the hot and dense fireball formed in the reaction region. Thanks to its excellent particle identification and momentum measurement performance, the ALICE detector allows for the identification of deuterons, tritons, 3 He and 4 He and the corresponding anti-nuclei. This is achieved via the measurement of their specific energy loss in the Time Projection Chamber and the velocity measurement by the Time-Of-Flight detector. Moreover, thanks to the Inner Tracking System capability to separate primary from secondary vertices, it is possible to identify (anti-)hypertriton through the mesonic weak decay 3 Λ H → ( 3 He + π − ). The direct decay time measurement of (anti-)hypertriton is difficult, but the excellent determination of primary and decay vertices, i.e. of the decay length, allows for the measurement of mean lifetime via an exponential fit of the proper decay time distribution. Results on the measurement of the hypertriton mean lifetime will be shown. Plans for the future LHC Run2 and Run3, with the expected improvements in the statistics and precision, will also be presented.

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“…Therefore, it had been difficult to conclude the lifetime of 3 Λ H, and it had been believed that the lifetime of 3 Λ H should be similar to that of the Λ-hyperon due to its small Λ-binding energy. We combined all the existing data till 2014 for the lifetime of 3 Λ H and 4 Λ H with a similar methodology of PDG, and results were already discussed in [12]. Results of the combined analyses are shown in Fig.…”

Section: The Likelihood Functionmentioning

confidence: 99%