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- W4294552011 abstract "We present our recent results for long-distance QCD effects in the FCNC radiative leptonic decays $Btogammaell^+ell^-$, $ell={e,mu}$. One encounters here two distinct types of long-distance effects: those encoded in the $Btogamma$ transition form factors induced by the $bto q$ quark currents, and those related to the charm-loop effects. We calculate the $Btogamma$ form factors in a broad range of the momentum transfers making use of the relativisitc dispersion approach based on the constituent quark picture which has proven to provide reliable predictions for many weak-transition form factors. Concerning the description of the charm-loop contributions, we point out two observations: First, the precise description of the charmonium resonances, in particular, the relative phases between $psi$ and $psi'$, has impact on the differential distributions and on the forward-backward asymmetry, $A_{rm FB}$, in a broad range of $q^2ge 5$ GeV$^2$. Second, the shape of $A_{rm FB}$ in $Btogammaell^+ell^-$ and in $Bto Vell^+ell^-$ ($V$ the vector meson) {it in the $q^2$-region between $psi$ and $psi'$} provides an unambiguous probe of the relative phases between $psi$ and $psi'$. Fixing the latter will lead to a strong reduction of the theoretical uncertainties in $A_{rm FB}$ at $q^2=5-9$ GeV$^2$ where it has the sensitivity to physics beyond the SM." @default.
- W4294552011 created "2022-09-04" @default.
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- W4294552011 date "2017-10-07" @default.
- W4294552011 modified "2023-09-29" @default.
- W4294552011 title "Rare FCNC radiative leptonic decays $Btogammaell^+ell^-$" @default.
- W4294552011 doi "https://doi.org/10.48550/arxiv.1710.02719" @default.
- W4294552011 hasPublicationYear "2017" @default.
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