On the anomalies in the latest LHCb data

By T. Hurth, Farvah Mahmoudi, S. Neshatpour. 2016

181 citations recorded by the source corpus.

Abstract Depending on the assumptions on the power corrections to the exclusive b → s l + l − decays, the latest data of the LHCb Collaboration – based on the 3 fb −1 data set and on two different experimental analysis methods – still shows some tensions with the Standard Model predictions. We present a detailed analysis of the theoretical inputs and various global fits to all the available b → s l + l − data. This constitutes the first global analysis of the new data of the LHCb Collaboration based on the hypothesis that these tensions can be at least partially explained by new physics contributions. In our model-independent analysis we present one-, two-, four-, and also five-dimensional global fits in the space of Wilson coefficients to all available b → s l + l − data. We also compare the two different experimental LHCb analyses of the angular observables in B → K ⁎ μ + μ − . We explicitly analyse the dependence of our results on the assumptions about power corrections, but also on the errors present in the form factor calculations. Moreover, based on our new global fits we present predictions for ratios of observables which may show a sign of lepton non-universality. Their measurements would crosscheck the LHCb result on the ratio R K = BR ( B + → K + μ + μ − ) / BR ( B + → K + e + e − ) in the low- q 2 region which deviates from the SM prediction by 2.6 σ .

Subfields: Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/668ae9fa91776336dde5d9ef94014852465f9a2e

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Citations in the corpus

Flavour anomalies after the RK∗ measurement (2017, result): “The latest global fit [17] to the relevant b → s`+`− observables shows that the presence of new physics can ameliorate the fit compared to the SM by more than 4σ, and similar results have been obtained previously by various groups [18, 19].”
Global analysis of b → sℓℓ anomalies (2015, result): “Note that the size of the form factor errors entering our analysis is much more conservative than what is typically assumed in other analyses [15, 22, 36], as we are taking form factors from Ref.”
Simultaneous explanation of the RK and R(D(⁎)) puzzles (2014, background): “However, the latest fits to the data [10, 11], which take into account the hadronic uncertainties, find that a discrepancy is still present.”
Patterns of New Physics in b → sℓ+ℓ− transitions in the light of recent data (2017, methodology): “observables only and the measurement by LHCb in the bins [4,6] and [6,8].”
Review of lepton universality tests in B decays (2018, unknown): “Recent combined analyses [126,127,153,162] single out some NP scenarios preferred over the SM with a significance at the 5σ level, consistently with earlier analyses that were mainly restricted to b→ s μ+μ− processes [155,163–165].”