Physics – High Energy Physics – High Energy Physics - Lattice
Scientific paper
2009-09-28
PoS LAT2009:241, 2009
Physics
High Energy Physics
High Energy Physics - Lattice
7 pages, 4 figures, Talk presented at the XXVII International Symposium on Lattice Field Theory, July 26-31, 2009, Beijing, Ch
Scientific paper
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. The final state meson in heavy-light decays at large recoil has sizeable momentum in the rest frame of the decaying meson. To reduce the resulting discretization errors we formulate the nonrelativistic heavy quark action in a moving frame. We discuss the perturbative renormalization of the leading order heavy-light operators in the resulting theory which is known as m(oving)NRQCD. We also present radiative corrections to the NRQCD action computed using automated lattice perturbation theory. By combining this technique with high-beta simulations in the weak coupling regime of the theory higher order loop corrections can be calculated very efficiently.
Davies Christine. T. H.
Hart Alistair
Horgan Ronald R.
Kendall Iain
Lee Andrew
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