New Bound on $\gamma$ from $B^{\pm} \to \pi K$ Decays

A new bound on the angle gamma of the unitarity triangle is derived using experimental information on the CP-averaged branching ratios for the rare decays B^+- -> pi^+- K^0 and B^+- -> pi^0 K^+-. The theoretical description is cleaner than the Fleischer-Mannel analysis of the decays B^+- ->...

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Detalles Bibliográficos
Autores principales: Neubert, Matthias, Rosner, Jonathan L.
Lenguaje:eng
Publicado: 1998
Materias:
Particle Physics - Phenomenology
Acceso en línea:https://dx.doi.org/10.1016/S0370-2693(98)01194-0
http://cds.cern.ch/record/363641
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author Neubert, Matthias
Rosner, Jonathan L.
author_facet Neubert, Matthias
Rosner, Jonathan L.
author_sort Neubert, Matthias
collection CERN
description A new bound on the angle gamma of the unitarity triangle is derived using experimental information on the CP-averaged branching ratios for the rare decays B^+- -> pi^+- K^0 and B^+- -> pi^0 K^+-. The theoretical description is cleaner than the Fleischer-Mannel analysis of the decays B^+- -> pi^+- K^0 and B^0 -> pi^-+ K^+- in that the two decay rates differ only in a single isospin amplitude, which has a simple structure in the SU(3) limit. As a consequence, electroweak penguin contributions and strong rescattering effects can be taken into account in a model-independent way. The resulting bound excludes values of cos(gamma) around 0.6 and is thus largely complementary to indirect constraints derived from a global analysis of the unitarity triangle.
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institution Organización Europea para la Investigación Nuclear
language eng
publishDate 1998
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spelling cern-3636412023-03-14T18:19:40Zdoi:10.1016/S0370-2693(98)01194-0http://cds.cern.ch/record/363641engNeubert, MatthiasRosner, Jonathan L.New Bound on $\gamma$ from $B^{\pm} \to \pi K$ DecaysParticle Physics - PhenomenologyA new bound on the angle gamma of the unitarity triangle is derived using experimental information on the CP-averaged branching ratios for the rare decays B^+- -> pi^+- K^0 and B^+- -> pi^0 K^+-. The theoretical description is cleaner than the Fleischer-Mannel analysis of the decays B^+- -> pi^+- K^0 and B^0 -> pi^-+ K^+- in that the two decay rates differ only in a single isospin amplitude, which has a simple structure in the SU(3) limit. As a consequence, electroweak penguin contributions and strong rescattering effects can be taken into account in a model-independent way. The resulting bound excludes values of cos(gamma) around 0.6 and is thus largely complementary to indirect constraints derived from a global analysis of the unitarity triangle.A bound on the angle gamma of the unitarity triangle is derived using experimental information on the CP-averaged branching ratios for the rare decays B^+- -> pi^+- K^0 and B^+- -> pi^0 K^+-. The theoretical description is cleaner than the Fleischer-Mannel analysis of the decays B^+- -> pi^+- K^0 and B^0 -> pi^-+ K^+- in that the two decay rates differ only in a single isospin amplitude, which has a simple structure in the SU(3) limit. As a consequence, electroweak penguin contributions and strong rescattering effects can be taken into account in a model-independent way. The resulting bound excludes values of cos(gamma) around 0.6 and is thus largely complementary to indirect constraints derived from a global analysis of the unitarity triangle.hep-ph/9808493CERN-TH-98-273EFI-98-38CERN-TH-98-273EFI-98-38-[CHICAGO]oai:cds.cern.ch:3636411998-09-01
spellingShingle Particle Physics - Phenomenology
Neubert, Matthias
Rosner, Jonathan L.
New Bound on $\gamma$ from $B^{\pm} \to \pi K$ Decays
title New Bound on $\gamma$ from $B^{\pm} \to \pi K$ Decays
title_full New Bound on $\gamma$ from $B^{\pm} \to \pi K$ Decays
title_fullStr New Bound on $\gamma$ from $B^{\pm} \to \pi K$ Decays
title_full_unstemmed New Bound on $\gamma$ from $B^{\pm} \to \pi K$ Decays
title_short New Bound on $\gamma$ from $B^{\pm} \to \pi K$ Decays
title_sort new bound on $\gamma$ from $b^{\pm} \to \pi k$ decays
topic Particle Physics - Phenomenology
url https://dx.doi.org/10.1016/S0370-2693(98)01194-0
http://cds.cern.ch/record/363641
work_keys_str_mv AT neubertmatthias newboundongammafrombpmtopikdecays
AT rosnerjonathanl newboundongammafrombpmtopikdecays

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