Measurement of the branching ratio for the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi mathvariant="normal">Ξ</mml:mi></mml:mrow><mml:mrow><mml:mi mathvariant="normal">−</mml:mi></mml:mrow></mml:msup></mml:mrow></mml:math>→<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi mathvariant="normal">Σ</mml:mi></mml:mrow><mml:mrow><mml:mi mathvariant="normal">−</mml:mi></mml:mrow></mml:m

Dubbs, T.; Albuquerque, I. F.; Bondar, N. F.; Carrigan, R. A.; Chen, D.; Cooper, P. S.; Lisheng, Dai; Denisov, A.; Dobrovolsky, A. V.; Endler, A. M. F.; Escobar, C.; Foucher, M.; Golovtsov, V. L.; Gottschalk, H.; Gouffon, P.; Grachev, V. T.; Khanzadeev, A.; Kubantsev, M.; Kuropatkin, N.P.; Lach, J.; Pengfei, Lang; Chengze, Li; Li, Yun-Shan; Luksys, M.; Mahon, J. R.; McCliment, E.; Morelos, A.; Newsom, C. R.; Maia, M. C. Pommot; Samsonov, V.; Schegelsky, V. A.; Huanzhang, Shi; Smith, V. J.; Fukun, Tang; Terentyev, N.; Timm, S.; Tkatch, I. I.; Vorobyov, A. A.; Yang, Jie; Wenheng, Zhao; Zheng, Sining; Yuanyuan, Zhong

doi:10.1103/physrevlett.72.808

Cited by 13 publications

(5 citation statements)

References 10 publications

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“…(2). 10.1 ± 0.5 −0.76 ± 0.08 [4,5] Ξ − → Σ − + γ 0.51 ± 0.092 1.0 ± 1.3 [6] TABLE II. Magnetic moments of the octet baryons and the transitional moment Σ 0 → Λ + γ in leading-order chiral perturbation theory.…”

Section: Discussionmentioning

confidence: 99%

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Hyperon weak radiative decays in chiral perturbation theory

et al. 1996

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We investigate the leading-order amplitudes for weak radiative decays of hyperons in chiral perturbation theory. We consistently include contributions from the next-to-leading order weak-interaction Lagrangian. It is shown that due to these terms Hara's theorem is violated. The data for the decays of charged hyperons can be easily accounted for. However, at this order in the chiral expansion, the four amplitudes for the decays of neutral hyperons satisfy relations which are in disagreement with the data. The asymmetry parameters for all the decays can not be accounted for without higher-order terms. We shortly comment on the effect of the 27-plet part of the weak interaction.Comment: 8 pages of REVTeX and using macro-package "feynman.tex" (available at http://xxx.lanl.gov/ftp/hep-ph/papers/macros) for the 2 figure

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Section: Discussionmentioning

confidence: 99%

“…Weak radiative decays of hyperons, B i → B f + γ, have received attention for a long time, both experimentally [1][2][3][4][5][6] and theoretically [7][8][9][10][11][12][13][14][15][16][17][18][19][20]. There have been several theoretical approaches to this problem.…”

Section: Introductionmentioning

confidence: 99%

Hyperon weak radiative decays in chiral perturbation theory

et al. 1996

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“…which is positive (+0.4 or +1.0 for constituent or current quark masses respectively) and thus in disagreement with experiment. Recent precise measurements of the Ξ − → Σ − γ branching ratio [11] (which proceeds through diagram (2a) only) prove, however, that there is no way of reproducing the Σ + → pγ branching ratio by assuming the dominance of diagram (2a): the predicted branching ratio is then too small by a factor of one hundred.…”

Section: Away From Su (3)mentioning

confidence: 99%

The puzzle of the quark model: Weak radiative hyperon decays

Żenczykowski

1996

Nuclear Physics B - Proceedings Supplements

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Weak radiative hyperon decays present us with a long-standing puzzle, namely the question of validity of a hadron-level theorem proved by Hara. We briefly discuss the conflict between expectations based on Hara's theorem and experiment as well as the way in which the quark model evades the theorem. Violation of Hara's theorem in the quark model is traced back to the issue of hadron compositeness and the nonequivalence of standard ways of imposing gauge-invariance condition at quark and hadron levels. This suggests that our understanding of nonlocal composite nature of hadrons may require some important change. *

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“…Using the diquark-photon interaction of Eqs. (7,8) we find that the diquark → diquark + γ transition amplitudes are proportional to:…”

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confidence: 95%

“…Very small size of the experimental Ξ − → Σ − γ branching ratio [8] relative to those of the Σ + → pγ, Λ → nγ, Ξ 0 → Λγ, and Ξ 0 → Σ 0 γ processes means that s → dγ single-quark transitions are negligible in Σ + , Λ, and Ξ 0 decays. Thus, as already indicated by the analysis of Gilman and Wise [9], the dominant contribution must come from processes involving at least two quarks.…”

mentioning

confidence: 99%