# Inclusive $$\overline{B}\to {X}_s{\ell}^{+}{\ell}^{-}$$ : complete angular analysis and a thorough study of collinear photons

Journal of High Energy Physics, Jun 2015

We investigate logarithmically enhanced electromagnetic corrections of all angular observables in inclusive $$\overline{B}\to {X}_s{\ell}^{+}{\ell}^{-}$$. We present analytical results, which are supplemented by a dedicated Monte Carlo study on the treatment of collinear photons in order to determine the size of the electromagnetic logarithms. We then give the Standard Model predictions of all observables, considering all available NNLO QCD, NLO QED and power corrections, and investigate their sensitivity to New Physics. Since the structure of the double differential decay rate is modified in the presence of QED corrections, we also propose new observables which vanish if only QCD corrections are taken into account. Moreover, we study the experimental sensitivity to these new observables at Belle II.

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Tobias Huber, Tobias Hurth, Enrico Lunghi. Inclusive $$\overline{B}\to {X}_s{\ell}^{+}{\ell}^{-}$$ : complete angular analysis and a thorough study of collinear photons, Journal of High Energy Physics, 2015, 176, DOI: 10.1007/JHEP06(2015)176