An analysis of the Standard Model prediction for ℬ(Bc→ tau nu)

Maat, Franca (2022) An analysis of the Standard Model prediction for ℬ(Bc→ tau nu). Bachelor's Thesis, Physics.

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Abstract

The currently available numerical Standard Model predictions for the branching fraction of the Bc → tau nu decay are analyzed based on their input parameters. Through error analysis of these parameters, the Bc meson decay constant and the Vcb CKM matrix element emerge to be key factors. The study of the Bc meson decay constant prompts an analysis of HISQ and NRQCD formulation used to discretize the heavy bottom quark onto a lattice for lattice QCD calculations. The study of the Vcb matrix element prompts an analysis of the different methods of exclusive determinations and another look at the difference between exclusive and inclusive determinations. Based on the obtained insights from these analyses, both an exclusive and an inclusive updated prediction of the branching fraction are computed. The updated prediction of the branching fraction is determined to be (1.96 ± 0.09) × 10^-2 using an exclusive determination of Vcb and (2.28 ± 0.10) × 10^-2 using an inclusive determination of Vcb. These improved predictions can be used as reference for future comparison to an experimental measurement of this branching fraction, aiding in the search for physics beyond the Standard Model.

Item Type:	Thesis (Bachelor's Thesis)
Supervisor name:	Bruyn, K.A.M. de
Degree programme:	Physics
Thesis type:	Bachelor's Thesis
Language:	English
Date Deposited:	15 Nov 2022 13:37
Last Modified:	15 Nov 2022 13:37
URI:	https://fse.studenttheses.ub.rug.nl/id/eprint/28957

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