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Abstract: Rare decays of B mesons, such as B \to K^*\gamma and B\to K^{*}\ell^+\ell^-are loop suppressed in the Standard Model and sensitive to new physics. Thefinal state meson in heavy-light decays at large recoil has sizeable momentumin the rest frame of the decaying meson. To reduce the resulting discretizationerrors we formulate the nonrelativistic heavy quark action in a moving frame.We discuss the perturbative renormalization of the leading order heavy-lightoperators in the resulting theory which is known as movingNRQCD.We also present radiative corrections to the NRQCD action computed usingautomated lattice perturbation theory. By combining this technique withhigh-beta simulations in the weak coupling regime of the theory higher orderloop corrections can be calculated very efficiently.



Autor: Eike H. Müller, Christine T. H. Davies, Alistair Hart, Georg M. von Hippel, Ron R. Horgan, Iain Kendall, Andrew Lee, Stefan Mein

Fuente: https://arxiv.org/







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