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T: Fachverband Teilchenphysik

T 15: Flavourphysik (Theorie) I

T 15.6: Vortrag

Mittwoch, 17. März 2010, 15:15–15:30, HG XIII

Exclusive decays B to K l l from light-cone sum rules — Alexander Khodjamirian¹, Thomas Mannel¹, Aleksey Pivovarov², and •Yuming Wang¹ — ¹University Siegen, D-57068, Siegen, Germany — ²Institute for Nuclear Research of Russian, 7a,60th October Anniversary prospect, Moscow 117312, Russia

We obtain the B to K l l invariant dilepton mass distribution, employing an improved light-cone sum rule calculation of B to K form factors. The SU(3)-symmetry breaking effects, including those in the K meson distribution amplitudes are updated. Utilizing the z series parameterization, we also investigate the transfer momentum dependence of transition form factors, by matching this parameterization to the light-cone sum rule predictions at small and moderate momentum transfers. Apart from the factorizable contributions of quark-lepton O_9 and chromomagnetic O_7 operators, some nonfactorizable effects in the B to K l l decay amplitude are also included in our analysis.