Journal
JOURNAL OF HIGH ENERGY PHYSICS
Volume -, Issue 2, Pages -Publisher
SPRINGER
DOI: 10.1007/JHEP02(2013)010
Keywords
Rare Decays; B-Physics; Sum Rules; QCD
Categories
Funding
- German Ministry of Research (BMSF) [05H09PSF]
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We predict the amplitude of the B -> Kl(+)l(-) decay in the region of the dilepton invariant mass squared 0 < q(2) <= m(J/psi)(2), that is, at large hadronic recoil. The B -> K form factors entering the factorizable part of the decay amplitude are obtained from QCD light one sum rules. The nonlocal effects, generated by the four-quark and penguin operators combined with the electromagnetic interaction, are calculated at q(2) < 0, far below the hadronic thresholds. For hard-gluon contributions we employ the QCD factorization approach. The soft-gluon nonfactorizable contributions are estimated from QCD light-cone sum rules. The result of the calculation is matched to the hadronic dispersion relation in the variable q(2), which is then continued to the kinematical region of the decay. The overall effect of nonlocal contributions in B -> Kl(+)l(-) at large hadronic recoil is moderate. The main uncertainty of the predicted B -> Kl(+)l(-) partial width is caused by the B -> K form factors. Furthermore, the isospin asymmetry in this decay is expected to be very small. We investigate the deviation of the observables from the Standard Model predictions by introducing a generic new physics contribution to the effective Hamiltonian.
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