Semileptonic <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><msub><mi>B</mi><mrow><mo stretchy="false">(</mo><mi>s</mi><mo stretchy="false">)</mo></mrow></msub></math> decays to excited charmed mesons with <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><mi>e</mi></mrow></math>, <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><mi>μ</mi></mrow></math>, <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><mi>τ</mi></mrow></math> and searching for new physics with <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi>R</mi><mo stretchy="false">(</mo><mi>D</mi><mrow><mo>*</mo><mo>*</mo></mrow><mo stretchy="false">)</mo></math>

Florian U. Bernlochner; Zoltan Ligeti

doi:10.1103/PhysRevD.95.014022

Semileptonic $B_{(s)}$ decays to excited charmed mesons with $e$ , $μ$ , $τ$ and searching for new physics with $R (D * *)$

Florian U. Bernlochner¹ and Zoltan Ligeti²

¹Physikalisches Institut der Rheinischen Friedrich-Wilhelms-Universität Bonn, 53115 Bonn, Germany
²Ernest Orlando Lawrence Berkeley National Laboratory, University of California, Berkeley, California 94720, USA

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Phys. Rev. D 95, 014022 – Published 23 January, 2017

DOI: https://doi.org/10.1103/PhysRevD.95.014022

Abstract

Semileptonic $B$ meson decays into the four lightest excited charmed meson states ( $D_{0}^{*}$ , $D_{1}^{*}$ , $D_{1}$ , and $D_{2}^{*}$ ) and their counterparts with $s$ quarks are investigated, including the full lepton mass dependence. We derive the standard model predictions for the differential branching fractions, as well as predictions for the ratios of the semitauonic and light-lepton semileptonic branching fractions. These can be systematically improved using future measurements of the total or differential semileptonic rates to $e$ and $μ$ , as well as the two-body hadronic branching fractions with a pion, related by factorization to the semileptonic rate at maximal recoil. To illustrate the different sensitivities to new physics, we explore the dependence of the ratio of semitauonic and light-lepton branching fractions to possible four-fermion scalar interactions.

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Semileptonic $B_{(s)}$ decays to excited charmed mesons with $e$ , $μ$ , $τ$ and searching for new physics with $R (D * *)$

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Semileptonic B(s) decays to excited charmed mesons with e, μ, τ and searching for new physics with R(D**)

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Semileptonic $B_{(s)}$ decays to excited charmed mesons with $e$ , $μ$ , $τ$ and searching for new physics with $R (D * *)$