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- W291380546 abstract "The rare multi-body decays $$ overline{B}to overline{K}pi ell ell $$ and $$ {overline{B}}_s to overline{K}Kell ell $$ are both important as backgrounds to precision analyses in the benchmark modes $$ overline{B}to {overline{K}}^{*}ell ell $$ and $$ {overline{B}}_sto phi ell ell $$ as well as sensitive probes of flavor physics in and beyond the standard model. We work out non-resonant contributions to $$ overline{B}to overline{K}pi ell ell $$ and $$ {overline{B}}_s to overline{K}Kell ell $$ amplitudes, where ℓ = e,μ, at low hadronic recoil in a model-independent way. Using the operator product expansion in 1/m b , we present expressions for the full angular distribution. The latter allows to probe new combinations of |ΔB| = |ΔS| = 1 couplings and gives access to strong phases between non-resonant and resonant contributions. Exact endpoint relations between transversity amplitudes based on Lorentz invariance are obtained. Several phenomenological distri- butions including those from the angular projections to the S-, P-, D-waves are given. Standard model branching ratios for non-resonant $$ overline{B}to overline{K}pi ell ell $$ and $$ {overline{B}}_s to overline{K}Kell ell $$ decays are found to be in the few 10−8 region, but drop significantly if cuts around the K * or ϕ mass are employed. Nevertheless, the non-resonant contributions to $$ overline{B}to overline{K}pi ell ell $$ provide the dominant background in the $$ overline{B}to {overline{K}}^{*}ell ell $$ signal region with respect to the low mass scalars. In $$ {overline{B}}_s to overline{K}Kell ell $$ , the narrowness of the ϕ allows for more efficient background control. We briefly discuss lepton-flavor non-universal effects, also in view of the recent data on R K ." @default.
- W291380546 created "2016-06-24" @default.
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- W291380546 date "2014-09-01" @default.
- W291380546 modified "2023-10-14" @default.
- W291380546 title "The B ¯ → K ¯ πℓℓ $$ overline{B}to overline{K}pi ell ell $$ and B ¯ s → K ¯ Kℓℓ $$ {overline{B}}_s to overline{K}Kell ell $$ distributions at low hadronic recoil" @default.
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- W291380546 doi "https://doi.org/10.1007/jhep09(2014)109" @default.
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