Three-particle distribution in the 
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 meson and charm-quark loops in FCNC 
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 decays

Melikhov, Dmitri

doi:10.1103/physrevd.108.034007

Phys. Rev. D

2023

DOI: 10.1103/physrevd.108.034007

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Three-particle distribution in the B meson and charm-quark loops in FCNC B decays

Dmitri Melikhov

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2024

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Cited by 4 publications

References 27 publications

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Non-factorisable effects in the decays $$ {\overline{B}}_s^0\to {D}_s^{+}{\pi}^{-} $$ and $$ {\overline{B}}^0\to {D}^{+}{K}^{-} $$ from LCSR

Piscopo,

Rusov

2023

J. High Energ. Phys.

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In light of the current discrepancies between the recent predictions based on QCD factorisation (QCDF) and the experimental data for several non-leptonic colour-allowed two-body B-meson decays, we obtain new determinations of the non-factorisable soft-gluon contribution to the decays $$ {\overline{B}}_s^0\to {D}_s^{+}{\pi}^{-} $$ B ¯ s 0 → D s + π − and $$ {\overline{B}}^0\to {D}^{+}{K}^{-} $$ B ¯ 0 → D + K − , using the framework of light-cone sum rule (LCSR), with a suitable three-point correlation function and B-meson light-cone distribution amplitudes. In particular, we discuss the problem associated with a double light-cone (LC) expansion of the correlator, and motivate future determinations of the three-particle B-meson matrix element with the gluon and the spectator quark aligned along different light-cone directions. Performing a LC-local operator product expansion of the correlation function, we find, for both modes considered, the non-factorisable part of the amplitude to be sizeable and positive, however, with very large systematic uncertainties. Furthermore, we also determine for the first time, using LCSR, the factorisable amplitudes at LO-QCD, and thus the corresponding branching fractions. Our predictions are in agreement with the experimental data and consistent with the results based on QCDF, although again within very large uncertainties. In this respect, we provide a rich outlook for future improvements and investigations.

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Non-factorisable effects in the decays $$ {\overline{B}}_s^0\to {D}_s^{+}{\pi}^{-} $$ and $$ {\overline{B}}^0\to {D}^{+}{K}^{-} $$ from LCSR

Piscopo,

Rusov

2023

J. High Energ. Phys.

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Charming-loop contribution to Bs→γγ decay

Belov,

Berezhnoy,

Melikhov

2023

Phys. Rev. D

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Nonfactorizable charming-loop contribution to FCNC Bs→γl+l− decay

Belov,

Berezhnoy,

Melikhov

2024

Phys. Rev. D

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We present the first theoretical calculation of nonfactorizable charm-quark loop contributions to the Bs→γl+l− amplitude. We calculate the relevant form factors, HA,VNF(k′2,k2), and provide convenient parametrizations of our results in the form of fit functions of two variables, k′2 and k2, applicable in the region below hadron resonances, k′2<MJ/ψ2 and k2<Mϕ2. We report that factorizable and nonfactorizable charm contributions to the Bs→γl+l− amplitude have opposite signs. To compare the charm and the top contributions, it is convenient to express nonfactorizable charming loop contribution as a nonuniversal (i.e., dependent on the reaction) q2-dependent correction ΔNFC7(q2) to the Wilson coefficient C7. For the Bs→γl+l− amplitude, the correction is found to be positive, ΔNFC7(q2)/C7>0. Published by the American Physical Society 2024

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Three-particle distribution in the B meson and charm-quark loops in FCNC B decays

Cited by 4 publications

References 27 publications

Non-factorisable effects in the decays $$ {\overline{B}}_s^0\to {D}_s^{+}{\pi}^{-} $$ and $$ {\overline{B}}^0\to {D}^{+}{K}^{-} $$ from LCSR

Non-factorisable effects in the decays $$ {\overline{B}}_s^0\to {D}_s^{+}{\pi}^{-} $$ and $$ {\overline{B}}^0\to {D}^{+}{K}^{-} $$ from LCSR

Charming-loop contribution to Bs→γγ decay

Nonfactorizable charming-loop contribution to FCNC Bs→γl+l− decay

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