Search for strange (S = −2) dibaryons in the reaction K− + d → K+ + MM at 1.4 GeV/c

D’Agostini, G.; Auriemma, G.; Marini, G.; Martellotti, G.; Massa, F.; Nigro, A.; Rambaldi, Alicia N.; Sciubba, A.; Brion, J.P. De; Caillet, A.; Chèze, J.B.; Derré, J.; Marel, G.; Pauli, E.; Pigot, C.; Vrana, G.; Reucroft, S.; Roos, C. E.; Webster, M.; Williams, E.; Llosá, R.; Schultze, K.

doi:10.1016/0550-3213(82)90098-0

Cited by 15 publications

(3 citation statements)

References 18 publications

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“…Because of the Pauli principle, the 3 S 1 partial wave of the system is forbidden so that there is no coupling between the and N channels for the partial wave in question. Experimental information on the N invariant mass spectrum is scarce [61][62][63]. Results published in Ref.…”

Section: The N and Scattering Lengthsmentioning

confidence: 99%

“…In any case, the statistics is too low for drawing any conclusions. The situation is better for an experiment performed at Saclay [62] where the missing mass (MM) in the reaction K − d → K + + MM at 1.4 GeV/c was studied. The curve presented in this publication exhibits a rather smooth behavior around the N threshold, which suggests that the − n interaction in the 1 S 0 and/or 3 S 1 might be fairly weak.…”

Section: The N and Scattering Lengthsmentioning

confidence: 99%

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Scattering lengths of strangenessS=−2baryon-baryon interactions

2012

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We reconsider a method based on dispersion theory that allows one to extract the scattering length of any two-baryon system from corresponding final-state interactions in production reactions. The application of the method to baryon-baryon systems with strangeness S = −2 and S = −3 systems is discussed. Theoretical uncertainties due to the presence of inelastic channels with near-by thresholds are examined for the specific situation of the reaction K − d → K 0 and the coupling of to the N channel. The possibility to disentangle spin-triplet and spin-singlet scattering lengths by means of various polarization measurements is demonstrated for several production reactions in K − d and γ d scattering. Employing the method to available data on the invariant mass from the reaction 12 C(K − , K + X), a 1 S 0 scattering length of a = −1.2 ± 0.6 fm is deduced.

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Section: The N and Scattering Lengthsmentioning

confidence: 99%

Section: The N and Scattering Lengthsmentioning

confidence: 99%

Scattering lengths of strangenessS=−2baryon-baryon interactions

2012

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“…For both D and D * strong tensor forces are responsible. The experimental search for BB bound states in the mass range 2.1-2.5 GeV/c 2 was negative [34]. To this we remark that in the ESC08 model the existence of the D * -state is rather necessary to produce an attractive Ξ-nucleus potential as indicated by [35].…”

Section: S=-1-2 Hyperon-nucleon/hyperon: Esc08mentioning

confidence: 99%

Baryon–Baryon {8}\( \otimes \){8}-Channels Interactions

Rijken¹,

Nagels²,

Yamamoto³

2017

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

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The extended-soft-core model ESC08 is presented. The ESC-models are at present the most complete meson-exchange models for the baryon-baryon interactions. The ESC-model describes the nucleonnucleon (NN), hyperon-nucleon (YN), and hyperon-hyperon (YY), in terms of meson-exchanges using (broken) SU(3) f -symmetry. In this approach to baryon-baryon (BB) the dynamics is derived from (i) one-boson-exchanges (OBE), (ii) two-meson-exchanges (TME), and (iii) meson-pair-exchanges (MPE), (iv) gluon-exchanges in the form of the pomeron and odderon potentials, and (v) quarkcore effects. In the OBE-sector, special features are: (a) the inclusion of a zero in the scalar-and axial-meson form-factors, (b) the odderon-exchage representing the exchange of the odd-number gluons-exchange, whereas the pomeron represents the even-number gluon-exchange, and (c) special pronounced effects of the appearance of forbidden six-quark configurations. With these ingredients a rather flexible dynamical framework is constructed. Namely, it appeared feasible to keep the parameters of the model in reasonable accordance with the predictions of the 3 P 0 quark-pair-creation model (QPC), although in ESC08a,b,c an admixture of 3 S 1 quark-pair creation is present. This is the case for the meson-and meson-pair-baryon coupling constants and the F/(F + D)-ratio's as well. The NN, YN, and YY results for this model are excellent. This is marked in particularly by the NN-results, namely χ 2 p.d.p. = 1.08 for ESC08a,b,c. Also, we improved the ΛN spin-orbit interaction greatly by the inclusion of (a) the Brown, Downs, and Iddings anti-symmetric spin-orbit potentials, and (b) new corrections to the MPE-potentials. Also, the special quark-core effects provide extra repulsion in the Σ + p( 3 S 1 , T = 3/2)-and ΣN( 1 S 0 , T = 1/2)-channels, although the strength is constrained by SU(3) symmetry and the Σ + p experimental X-sections. In the S=-2 sector the ΛΛ-interaction is weak, which is in accordance with the NAGARA-event. Furthermore, in the ΞN( 3 S 1 , I = 1) there occurs a "strange-deuteron" D * with binding-energy E * B ≈ 2.0 − 1.5 MeV. A very notable consequence of the MPE-vertices are the related three-body forces (TBF). In this conference we report on the predictions of these TBF's for (i) the triton binding energy, and (ii) the charge-symmetry-breaking (CSB) effects. The first results are encouraging.

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The current status of dibaryon searches

Seth

Electron and Photon Interactions at Intermediate Energies

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Search for strange (S = −2) dibaryons in the reaction K− + d → K+ + MM at 1.4 GeV/c

Cited by 15 publications

References 18 publications

Scattering lengths of strangenessS=−2baryon-baryon interactions

Scattering lengths of strangenessS=−2baryon-baryon interactions

Baryon–Baryon {8}\( \otimes \){8}-Channels Interactions

The current status of dibaryon searches

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