Production of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msubsup><mml:mrow /><mml:mrow><mml:mi>Λ</mml:mi><mml:mi>Λ</mml:mi></mml:mrow><mml:mrow><mml:mn>4</mml:mn></mml:mrow></mml:msubsup></mml:mrow><mml:mi>H</mml:mi></mml:math>Hypernuclei

Ahn, J. K.; Ajimura, S.; Akikawa, H.; Bassalleck, B.; Berdoz, A.; Carman, D. S.; Chrien, R.E.; Davis, C. A.; Eugenio, P.; Fischer, H.; Franklin, G.; Franz, J.; Fukuda, T.; Gan, L.; Hotchi, H.; Ichikawa, A. K.; Imai, K.; Kahana, S.; Khaustov, P.; Kishimoto, T.; Koran, P.; Kohri, H.; Kourepin, A.; Kubota, Katsumi; Landry, M.; May, M.; Meyer, C. A.; Meziani, Z. E.; Minami, S.; Miyachi, T.; Nagae, T.; Nakano, Junzo; Outa, H.; Paschke, K.; Pile, P.; Prokhabatilov, M.; Quinn, B.; Rasin, V.; Rusek, A.; Schmitt, H.; Schumacher, R. A.; Sekimoto, M.; Shileev, K.; Shimizu, Yuki; Sutter, Reto; Tamagawa, Toru; Tang, L.; Tanida, K.; Yamamoto, Kentaro; Yuan, L.

doi:10.1103/physrevlett.87.132504

Cited by 118 publications

(79 citation statements)

References 14 publications

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“…Finally, we remark that 4 ΛΛ H with ΛΛ-ΞN and ΛN -ΣN couplings has been studied before with phenomenological Y N and Y Y interactions [31]. 2 They reported possible existence of a weakly bound state below d + Λ + Λ threshold, which has not yet been confirmed experimentally [32]. Also, Cottenssi et al [33] have recently emphasized that the particle stability of A = 5 double Λ hypernuclei ( 5 ΛΛ He and 5 ΛΛ H) is robust.…”

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confidence: 90%

Possible Lightest Ξ Hypernucleus with Modern ΞN Interactions

et al. 2020

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Experimental evidence exists that the Ξ-nucleus interaction is attractive. We search for N N Ξ and N N N Ξ bound systems on the basis of the AV8 N N potential combined with either a phenomenological Nijmegen ΞN potential or a first principles HAL QCD ΞN potential. The binding energies of the three-body and four-body systems (below the d+Ξ and 3 H/ 3 He+Ξ thresholds, respectively) are calculated by a high precision variational approach, the Gaussian Expansion Method. Although the two ΞN potentials have significantly different isospin (T ) and spin (S) dependence, the N N N Ξ system with quantum numbers (T = 0, J π = 1 + ) appears to be bound (one deep for Nijmegen and one shallow for HAL QCD) below the 3 H/ 3 He + Ξ threshold. Experimental implications for such a state are discussed.

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confidence: 90%

Possible Lightest Ξ Hypernucleus with Modern ΞN Interactions

et al. 2020

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“…Indeed, a slightly bound I = 0 4 ΛΛ H(1 + ) was found in ΛΛpn four-body calculations by Nemura et al [10,11] but not in a four-body calculation by Filikhin and Gal [12] who nonetheless got it bound as a ΛΛd cluster. Unfortunately, the AGS-E906 counter experiment [13] searching for light ΛΛ hypernuclei failed to provide conclusive evidence for the particle stability of 4 ΛΛ H [14,15]. Interestingly, the neutral four-body system 4 ΛΛ n has been assigned in Ref.…”

Section: Pacs Numbersmentioning

confidence: 99%

The onset of ΛΛ hypernuclear binding

et al. 2019

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Binding energies of light, A ≤ 6, ΛΛ hypernuclei are calculated using the stochastic variational method in a pionless effective field theory (/ πEFT) approach at leading order with the purpose of assessing critically the onset of binding in the strangeness S = −2 hadronic sector. The / πEFT input in this sector consists of (i) a ΛΛ contact term constrained by the ΛΛ scattering length aΛΛ, using a range of values compatible with ΛΛ correlations observed in relativistic heavy ion collisions, and (ii) a ΛΛN contact term constrained by the only available A ≤ 6 ΛΛ hypernucler binding energy datum of 6 ΛΛ He. The recently debated neutral three-body and four-body systems 3 ΛΛ n and 4 ΛΛ n are found unbound by a wide margin. A relatively large value of |aΛΛ| 1.5 fm is needed to bind 4 ΛΛ H, thereby questioning its particle stability. In contrast, the particle stability of the A = 5 ΛΛ hypernuclear isodoublet 5 ΛΛ H-5 ΛΛ He is robust, with Λ separation energy of order 1 MeV. PACS numbers: Introduction. Single-Λ and double-Λ (ΛΛ) hypernuclei provide a unique extension of nuclear physics into strange hadronic matter [1]. Whereas the behavior of a single Λ hyperon in atomic nuclei has been deduced quantitatively by studying Λ hypernuclei ( A Λ Z) from A=3 to 208 [2], only three ΛΛ hypernuclei ( A ΛΛ Z) are firmly established: the lightest known 6 ΛΛ He Nagara event [3] and two heavier ones, 10 ΛΛ Be and 13 ΛΛ B [4]. Remarkably, their binding energies come out consistently in shell-model calculations [5]. Few ambiguous emulsion events from KEK [6] and J- PARC [7] have also been reported. However, and perhaps more significant is the absence of any good data on the onset of ΛΛ hypernuclear binding for A < 6. In distinction from the heavier species, these very light s-shell species, if bound, could be more affected by microscopic strangeness S = −2 dynamics. An obvious issue is the effect of a possible ΞN dominated H dibaryon resonance some 20-30 MeV above the ΛΛ threshold [8,9] on ΛΛ hypernuclear binding in general.Several calculations of light A < 6 s-shell ΛΛ hypernuclei using ΛΛ interactions fitted to 6 ΛΛ He suggest a fairly weak ΛΛ interaction, with the onset of ΛΛ hypernuclear binding defered to A = 4. Indeed, a slightly bound I = 0

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“…In the KEK-E373 experiment the interaction energy 1 inside 6 He is measured as B 1.0 MeV, which suggests a weakly attractive interaction [9]. In addition, the formation of another double-hypernucleus, 4 H, is conjectured in the BNL-AGS E906 experiment [10]. Theoretically, although the first Faddeev-Yakubovsky calculation showed a negative result [11], subsequent theoretical studies [12][13][14][15] predicted the possibility of the 4 H bound state based on the phenomenological potentials which can describe the bound state of 6 He.…”

Section: Introductionmentioning

confidence: 95%

ΛΛ4H in halo effective field theory

Ando

Yang

2014

Phys. Rev. C

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The 4 H bound state and the S-wave hypertriton( 3 H)-scattering in spin singlet and triplet channels below the hypertriton breakup momentum scale are studied in halo/cluster effective field theory at leading order by treating the 4 H system as a three-cluster ( --deuteron) system. In the spin singlet channel, the amplitude is insensitive to the cutoff parameter c introduced in the integral equation, and we find that there is no bound state. In this case, the scattering length of the hypertriton-scattering is found to be a 0 = 16.0 ± 3.0 fm. In the spin triplet channel, however, the amplitude obtained by the coupled integral equations is sensitive to c , and we introduce the three-body contact interaction g 1 ( c ). After phenomenologically fixing g 1 ( c ), we find that the correlation between the two-separation energy B from the 4 H bound state and the scattering length a of the S-wave -scattering is significantly sensitive to the value of c .

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Production ofΛΛ4HHypernuclei

Cited by 118 publications

References 14 publications

Possible Lightest Ξ Hypernucleus with Modern ΞN Interactions

Possible Lightest Ξ Hypernucleus with Modern ΞN Interactions

The onset of ΛΛ hypernuclear binding

ΛΛ4H in halo effective field theory

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