Charmonium contribution to $B \to K l^+l^-$: testing the factorization approximation on the lattice
January 29, 2020
We report the current status of a study of charmonium contribution to B → Kl+l− on the lattice. Our lattice calculation tests the factorization approximation for this contribution. In order to control the problem of the artificial divergence, we focus on the low q2 region with a small b-quark mass. We also take into account the renormalization constants of relevant four-quark operators calculated through the temporal moments. Results suggest a violation of the factorization approximation.
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