Some properties of the charged Σ hyperons

Tovee, D.N.; Davis, D. H.; Simonović, J.; Böhm, G.; Klabuhn, J.; Wysotzki, Fritz; Csejthey-Barth, M.; Wickens, J.; Cantwell, T.; Ghógáin, C.Ní; Montwill, A.; Garbowska-Pniewska, K.; Pniewski, T; Zakrzewski, J.

doi:10.1016/0550-3213(71)90302-6

Cited by 159 publications

(158 citation statements)

References 13 publications

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“…The points eliminated will be displayed in red in the figures. We also fit the parameters of our model to the measured branching ratios [53,54], γ = 2.36 ± 0.04, R n = 0.664 ± 0.011, R c = 0.189 ± 0.015, and to the recent energy shift and width of the 1s state of kaonic hydrogen obtained by the SIDDHARTA Collaboration [19], namely E 1s = 283 ± 36 and 1s = 541 ± 92. The distribution of points per observable is summarized in Table I.…”

Section: B Data Treatment and Fitsmentioning

confidence: 99%

TheK¯N→KΞreaction in coupled-channels chiral models up to next-to-leading order

2015

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The meson-baryon interaction in s wave in the strangeness S = −1 sector has been studied, employing a chiral SU(3) Lagrangian up to next-to-leading order (NLO) and implementing unitarization in coupled channels. The parameters of the Lagrangian have been fitted to a large set of experimental data in different two-body channels, paying special attention to theKN → K reaction, which is particularly sensitive to the NLO terms. With the aim of improving the model in the K production channels, effects of the high spin hyperon resonances (2030) and (2250) have been taken into account phenomenologically.

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Section: B Data Treatment and Fitsmentioning

confidence: 99%

TheK¯N→KΞreaction in coupled-channels chiral models up to next-to-leading order

2015

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“…in table 3). Both models were fitted to the same experimental data [17,[24][25][26][27]. From the first two columns of table 3, one can appreciate the difference between the fitting parameters of the two models.…”

Section: Resultsmentioning

confidence: 99%

“…We therefore include the corresponding data [36] in a new fitting procedure in order to find more reliable values of the NLO coefficients and the rest of the parameters such as subtraction constants. The new fit consists of an interaction kernel which takes into account the WT, the Born and NLO terms and considers a larger amount of scattering data, which covers all the elastic and inelastic processes of the sector [26,27,36] and the threshold observables cited previously [17,24,25]. The parameters of this fit, which is called WT+NLO+Born η chan, are displayed in the third column of table 3.…”

Section: Resultsmentioning

confidence: 99%

“…Assuming this and for simplicity, the Born contributions were disregarded in our study of [22] leaving the NLO term as the significant one in order to reach good agreement between the theoretical predictions and the experimental data in the KΞ channels. We fitted our model to the branching ratios at K − p threshold [24,25], the precise SIDDHARTA values of the shift and width of the 1s state of the kaonic hydrogen [17] and the cross-sections for the different two body channels (πΣ, πΛ,KN, KΞ) [26,27]. After comparing different fitting procedures, the sensitivity of the K − p → KΞ reactions to the NLO term of the chiral Lagrangian was demonstrated and, therefore, more reliable values of the low energy constants were obtained.…”

Section: Introductionmentioning

confidence: 99%

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Constraints on the S=-1 meson-baryon interaction at NLO

2017

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Abstract. This work contains a study of the meson-baryon interaction in the S = −1 sector by means of a chiral S U(3) Lagrangian up to next-to-leading order (NLO) and implementing unitarization in coupled channels. In order to get more reliable values of the parameters which are present in the model, we performed several fits which take a large set of experimental scattering data in different two-body channels, threshold branching ratios, and the precise SIDDHARTA values of the energy shift and width of kaonic hidrogen into consideration. In previous studies, we had shown that the K − p → KΞ reactions are especially sensitive to the next to Weinberg-Tomozawa (WT) corrections in the hierarchy. In addition, we pointed out the need to employ processes which are described by pure isospin amplitudes as a tool to discern which models are more realistic among those which give small values for the χ 2 in the fits. Following the former suggestion, we present results which include data from K − p → ηΛ, ηΣ reactions which have pure isospin I = 0 and I = 1 component respectively. Finally, to check the goodness of the new obtained parametrization of the model, we present a prediction for another process that filters the I = 1 isospin component: the pure I = 1 K − L p → K + Ξ 0 reaction which could be measured at the proposed secondary K 0 L beam at Jlab.

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“…In our fits we employ elastic and inelastic cross section data for different two body channels and the precise SIDDHARTA value of the energy shift and width of kaonic hidrogen, as well as, the branching ratios at threshold [11][12][13][14]. Since the lowest-order Lagrangian does not contribute directly to these reactions, one can expect that they will be especially sensitive to the NLO terms.…”

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confidence: 99%

The Role of High Spin Hyperon Resonances in the Ξ Production Meson-Baryon Reactions

Feijoo

Magas

Ramos

2017

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

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The Chiral SU(3) lagrangian extended to next-to-leading order (NLO) in the framework of coupledchannels has been used to study the meson-baryon interaction in S-wave in the strangeness S = −1 sector. A large set of experimental data in different two-body channels has been employed to fit the low energy constants of the lagrangian, paying special attention to theKN → KΞ reaction, which is particularly sensitive to the NLO terms. The reproduction of the structures present in the cross sections of the KΞ channels, as well as their differential cross sections, has been improved by taking into account the high spin hyperonic resonances by means of a phenomenological model.

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Some properties of the charged Σ hyperons

Cited by 159 publications

References 13 publications

TheK¯N→KΞreaction in coupled-channels chiral models up to next-to-leading order

TheK¯N→KΞreaction in coupled-channels chiral models up to next-to-leading order

Constraints on the S=-1 meson-baryon interaction at NLO

The Role of High Spin Hyperon Resonances in the Ξ Production Meson-Baryon Reactions

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