Precise predictions for B -> Xc tau nu decay distributions

TL;DR

This paper provides precise Standard Model predictions for B -> Xc tau nu decay distributions, incorporating corrections and shape function effects to enhance sensitivity to potential new physics beyond the Standard Model.

Contribution

It introduces refined calculations of decay distributions including higher-order corrections and shape function effects, improving the accuracy of predictions for new physics searches.

Findings

Enhanced decay distribution predictions with QCD and mass corrections

Estimation of shape function effects near maximal tau energy

Potential to improve sensitivity to beyond Standard Model physics

Abstract

We derive precise standard model predictions for the dilepton invariant mass and the tau energy distributions in inclusive B -> Xc tau nu decay. We include Lambda_QCD^2/m_b^2 and alpha_s corrections using the 1S short-distance mass scheme, and estimate shape function effects near maximal tau energy. These results can improve the sensitivity of b -> c tau nu related observables to beyond standard model physics.