Chiral loop corrections in B to D l nu decays

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We determine chiral loop corrections to the B meson decay amplitudes to positive and negative parity charmed mesons within a framework which combines heavy quark and chiral symmetries. We find that corrections due to states of opposite parity are competitive with the contributions arising from K and eta meson loops. Since lattice studies rely on the chiral behavior of the amplitudes we discuss the chiral limit of our results. We also comment on the extraction of 1/m_B, 1/m_D subleading form factors relevant for the studies of B_q to D_q tau nu decays, which are sensitive to possible helicity-suppressed new physics contributions.
4 pages, 2 figures, updated page style, references, contributed to proceedings of ICHEP08

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High Energy Physics - Phenomenology

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http://salesiana.dossiersoluciones.com/handle/123456789/171301

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/0810.0461
 http://arxiv.org/abs/0810.0461

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arXiv