An experimental study of the form factor in the decay K+ → πoe+ν

Braun, H. M.; Cornelssen, M.; Martyn, H. U.; Erriquez, O.; Natali, S.; Romanò, F.; Bertrand, Daniel; Csejthey-Barth, M.; Lemonne, J.; Renton, P.; Vilain, P.; Cundy, D.; Pedersen, T.I.; Waldren, D.

doi:10.1016/0370-2693(73)90601-1

Cited by 4 publications

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“…The most gênerai matrix élément for the Kg3 decays is then written as M = \/\G sind a (l -y.) (1) where «y and «g are the lepton spinors and and are, respectively, the kaon and pion four-momenta. The expressions for the Dalitz plot density and muon polarization obtained from this matrix élément are given in the appendix.…”

Section: Theoretical Frameworkmentioning

confidence: 99%

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A study of the semi-leptonic decays of K+ mesons

Braun¹,

Cornelssen²,

Martyn³

et al. 1975

Nuclear Physics B

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The form factors of the semi-leptonic decays K"*"->• Tr^e"*"!» and K"*"->•-n^ii^v have been investigated using a sample of events detected in the CERN 1.1 m^ heavy liquid bubble chamber. Analyses have been carried out using methods indépendant of any assumption of the q dependence of the form factors in addition to the usual linear parametrizations. Consistent results have been obtained from separate studies of both Dalitz plot density distributions and the branching ratio. A parametrized global analysis of both decay modes gives the values ï(0) =-1.3 ± 0.7 and Ç(4.4M^)=-0.45 ± 0.13, or \ =-0.017 ± 0.011 both for a fitted value of X+ = 0.025 ± 0.007. K^a-AV K^j-TrOeV KJJ-TTV»', K^j-Tr^e^.. I-* Chercheur agréé à l'IISN, Belgique. ** Erkend onderzoeker by het IIKW, België. w. * This is désirable in order to check the validity of the lineai expansions, especially as laige corrélations exist between the parameters. The depth of the chamber was later increased to 110 cm, increasing the visible volume by a factor of three. See e.g. Young [4]. * The upper limit éliminâtes the influence of bremsstrahlung 7-rays.

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Section: Theoretical Frameworkmentioning

confidence: 99%

“…The results of this experiment are completely compatible with the Callan-Treiman relation if ^{q^) is linear, even though this corresponds to a négative value for the slope Xg. It has, however, been suggested [55] that such a curvature off{q^) can only arise from violations of SU(2) X SU (2), which could also change the Callan-Treiman relation.…”

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confidence: 99%