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B → K∗ℓ+ℓ− decays at large recoil in the Standard Model: a theoretical reappraisal
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B → K∗ℓ+ℓ− decays at large recoil in the Standard Model: a theoretical reappraisal
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Journal Article
B → K∗ℓ+ℓ− decays at large recoil in the Standard Model: a theoretical reappraisal
2016
Overview
A
bstract
We critically reassess the theoretical uncertainties in the Standard Model calculation of the
B
→
K
∗
ℓ
+
ℓ
−
observables, focusing on the low
q
2
region. We point out that even optimized observables are affected by sizable uncertainties, since hadronic contributions generated by current-current operators with charm are difficult to estimate, especially for
q
2
∼ 4
m
c
2
≃ 6.8 GeV
2
. We perform a detailed numerical analysis and present both predictions and results from the fit obtained using most recent data. We find that non-factorizable power corrections of the expected order of magnitude are sufficient to give a good description of current experimental data within the Standard Model. We discuss in detail the
q
2
dependence of the corrections and their possible interpretation as shifts of the Standard Model Wilson coefficients.
Publisher
Springer Berlin Heidelberg
