What can be learned from the Belle spectrum for the decay tau- -> nu_tau K_S pi-

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dc.creatorJamin, Matthias
dc.creatorPich, Antonio
dc.creatorPortoles, Jorge
dc.date2008-03-12
dc.date.accessioned2026-07-07T11:33:09Z
dc.date.available2026-07-07T11:33:09Z
dc.descriptionA theoretical description of the differential decay spectrum for the decay tau- -> nu_tau K_S pi-, which is based on the contributing K pi vector and scalar form factors F_+^{K pi}(s) and F_0^{K pi}(s) being calculated in the framework of resonance chiral theory (R$χ$T), additionally imposing constraints from dispersion relations as well as short distance QCD, provides a good representation of a recent measurement of the spectrum by the Belle collaboration. Our fit allows to deduce the total branching fraction B[tau- -> nu_tau K_S pi-] = 0.427 +- 0.024 % by integrating the spectrum, as well as the K^* resonance parameters M_{K^*} = 895.3 +- 0.2 MeV and Gamma_{K^*} = 47.5 +- 0.4 MeV, where the last two errors are statistical only. From our fits, we confirm that the scalar form factor F_0^{K pi}(s) is required to provide a good description, but we were unable to further constrain this contribution. Finally, from our results for the vector form factor F_+^{K pi}(s), we update the corresponding slope and curvature parameters lambda'_+ = (25.2 +- 0.3)*10^{-3} and lambda''_+ = (12.9 +- 0.3)*10^{-4}, respectively.
dc.description15 pages, 2 figures
dc.identifierhttps://arxiv.org/abs/0803.1786
dc.identifierhttp://arxiv.org/abs/0803.1786
dc.identifierPhys.Lett.B664:78-83,2008
dc.identifierdoi:10.1016/j.physletb.2008.04.049
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/197793
dc.subjectHigh Energy Physics - Phenomenology
dc.subjectHigh Energy Physics - Experiment
dc.titleWhat can be learned from the Belle spectrum for the decay tau- -> nu_tau K_S pi-
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