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B →P and B →V form factors from B-meson light-cone sum rules beyond leading twist
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B →P and B →V form factors from B-meson light-cone sum rules beyond leading twist
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Journal Article
B →P and B →V form factors from B-meson light-cone sum rules beyond leading twist
2019
Overview
A
bstract
We provide results for the full set of form factors describing semileptonic
B
-meson transitions to pseudoscalar mesons
π
,
K
,
D
¯
and vector mesons
ρ
,
K
∗
,
D
¯
∗
. Our results are obtained within the framework of QCD Light-Cone Sum Rules with
B
-meson distribution amplitudes. We recalculate and confirm the results for the leading-twist two-particle contributions in the literature. Furthermore, we calculate and provide new expressions for the two-particle contributions up to twist four. Following new developments for the three-particle distribution amplitudes, we calculate and provide new results for the complete set of three-particle contributions up to twist four. The form factors are computed numerically at several phase space points using up-to-date input parameters, including correlations across phase space points and form factors. We use a model ansatz for all contributing
B
-meson distribution amplitudes that is self-consistent up to twist-four accuracy. We find that the higher-twist two-particle contributions have a substantial impact on the results, and dominate over the three-particle contributions. Our numerical results, including correlations, are provided as machine-readable files in the supplementary material. We discuss the qualitative phenomenological impact of our results on the present
b
anomalies.
Publisher
Springer Berlin Heidelberg,Springer Nature B.V,SpringerOpen
