B → K∗ℓ+ℓ− decays at large recoil in the Standard Model: a theoretical reappraisal

By Marco Ciuchini, M. Fedele, E. Franco, S. Mishima, Ayan Paul, L. Silvestrini, M. Valli. 2015

206 citations recorded by the source corpus.

A bstractWe critically reassess the theoretical uncertainties in the Standard Model calculation of the B → K∗ℓ+ℓ− observables, focusing on the low q2 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 q2 ∼ 4mc2 ≃ 6.8 GeV2. 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 q2 dependence of the corrections and their possible interpretation as shifts of the Standard Model Wilson coefficients.

Subfields: Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/dd9f5b0b15af0c2f907ca5649b4f5248e68781fe

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In Nuclear and High Energy Physics

Citations in the corpus

Global analysis of b → sℓℓ anomalies (2015, background): “[19, 61] to explain the current data at large recoil within the SM do not provide any clue about the deviations observed in B → K∗μμ and Bs → φμμ branching ratios at low recoil, whereas a single short-distance contribution to C9 is able to accommodate the deviations in both regions simultaneously.”
Patterns of New Physics in b → sℓ+ℓ− transitions in the light of recent data (2017, background): “Controversies on hadronic uncertainties (power corrections to form factors [18, 19], charm-loop contributions [20, 21]) have been addressed and resolved in Refs.”
On the anomalies in the latest LHCb data (2016, methodology): “[34] come to the well-known conclusion that it is difficult to deduce the existence of new physics effects unambiguously from the measurements of exclusive b→ s`+`− observables.”
Flavour anomalies after the RK∗ measurement (2017, background): “Despite these encouraging hints of new physics, it is hard to draw strong conclusions, since very conservative analyses of the theoretical hadronic uncertainties substantially reduce the global significance on the presence of new physics in the semi-leptonic B-meson decays [14].”
Opportunities in Flavour Physics at the HL-LHC and HE-LHC (2018, background): “Alongside theory predictions (CFFMPSV [1120], DHMV [1121], JC [843]) are also shown.”