Implications from clean observables for the binned analysis of B → K∗μ+μ− at large recoil
By S. Descotes-Genon, J. Matias, M. Ramon, J. Virto. 2012
297 citations recorded by the source corpus.
A bstractWe perform a frequentist analysis of q2-dependent B → K∗(→ Kπ)ℓ+ℓ− angular observables at large recoil, aiming at bridging the gap between current theoretical analyses and the actual experimental measurements. We focus on the most appropriate set of observables to measure and on the role of the q2-binning. We highlight the importance of the observables Pi exhibiting a limited sensitivity to soft form factors for the search for New Physics contributions. We compute predictions for these binned observables in the Standard Model, and we compare them with their experimental determination extracted from recent LHCb data. Analysing b → s and b → sℓ+ℓ− transitions within four different New Physics scenarios, we identify several New Physics benchmark points which can be discriminated through the measurement of Pi observables with a fine q2-binning. We emphasise the importance (and risks) of using observables with (un)suppressed dependence on soft form factors for the search of New Physics, which we illustrate by the different size of hadronic uncertainties attached to two related observables (P1 and S3). We illustrate how the q2-dependent angular observables measured in several bins can help to unravel New Physics contributions to B → K∗(→ Kπ)ℓ+ℓ−, and show the extraordinary constraining power that the clean observables will have in the near future. We provide semi-numerical expressions for these observables as functions of the relevant Wilson coefficients at the low scale.
Subfields: Nuclear and High Energy Physics
View Paper: https://www.semanticscholar.org/paper/9a8fbe8be67ef9fe6eef43b8325f03670d7f80da
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In Nuclear and High Energy Physics
- David M. Straub
- S. Descotes-Genon
- J. Virto
- Andrzej Buras
- Marco Nardecchia
- T. Hurth
- J. Camalich
- G. Isidori
Citations in the corpus
- An explicit Z′-boson explanation of the B → K∗μ+μ− anomaly (2013, background): “7σ arises in the variable P ′ 5 [3] (the analogue of S5 in [4]), which has specifically been designed to combine theoretical and experimental benefits, while retaining a high sensitivity to newphysics effects.”
- B →Vℓ+ℓ− in the Standard Model from light-cone sum rules (2015, background): “[68, 78,79] for definitions of the angular observables) and the B+ → K∗+μ+μ− branching ratio are given in Tabs.”
- Patterns of New Physics in b → sℓ+ℓ− transitions in the light of recent data (2017, background): “7 σ discrepancy between the measurement and the SM prediction in one bin for the angular observable P ′ 5 [4].”
- Implications of LHCb measurements and future prospects - eScholarship (2013, background): “Recently the effect of binning in q2 on these observables has been considered [72].”
- Review of lepton universality tests in B decays (2018, background): “The coefficients that appear in the differential decay-rate expression can be combined to define new angular observables, P ′ i [117–119], that are largely free of form-factor uncertainties.”
- Maximal flavour violation: a Cabibbo mechanism for leptoquarks (2018, background): “The presence of this universal contribution predicts a further enhancement ofP ′ 5 [85], beyond the one given by the tree-level effect.”