Test of factorization for the long-distance effects from charmonium in $B\rightarrow K\ell^+\ell^-$
May 29, 2019
We report on a calculation of the charmonium contribution to the decay $B \rightarrow K\ell^+\ell^-$ using lattice simulations with 2+1 flavors of Mobius domain wall fermions.
We focus on the region of $q^2$ below the $J/\psi$ resonance and test the factorization approximation to estimate the amplitude.
We show a possible discrepancy between lattice calculation and factorization method for the non-factorizable contribution.
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