What question did this study set out to answer?

To compute one-loop QCD corrections to the decay of B mesons into lepton-neutrino pairs, incorporating both Standard Model and beyond Standard Model effects.

July 6, 2026Journal of High Energy Physics0 citationsOpen Access

One-loop QCD corrections to B Xc in and beyond the Standard Model

ACAlexandre CarvunisTU Dortmund University GFGael FinauriIstituto Nazionale di Fisica Nucleare, Sezione di Torino

Key Points

To compute one-loop QCD corrections to the decay of B mesons into lepton-neutrino pairs, incorporating both Standard Model and beyond Standard Model effects.
Calculated the triple differential width of the decay process.
Incorporated contributions from dimension-six operators in the Weak Effective Theory (WET).
Derived analytic expressions for the first three moments in lepton and hadronic invariant mass distributions.
Identified significant contributions from QCD corrections to the decay width.
Presented expressions for moments in lepton energy and invariant masses, improving understanding of decay dynamics.
Showed how beyond Standard Model interactions can affect measured rates.

Abstract

A bstract We compute one-loop QCD corrections to the triple differential width of the inclusive decay B Xc B ¯ → X c ℓ ν ¯ ℓ including contributions from all relevant dimension-six operators in the Weak Effective Theory (WET), at leading power in the heavy quark expansion. Furthermore we derive for the first time up to order O (ₛ) O α s analytic expressions for the first three moments of the distribution in the lepton energy, hadronic invariant mass and dilepton invariant mass, in the presence of beyond the Standard Model contributions from the WET.

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