SciPost Submission Page
Delving into new physics in semileptonic b→cτˉν transitions
by Aishwarya Bhatta, Rukmani Mohanta
Submission summary
Ontological classification |
Academic field: |
Physics |
Specialties: |
- High-Energy Physics - Theory
- High-Energy Physics - Phenomenology
|
Approaches: |
Theoretical, Phenomenological |
Abstract
Recently, several indications of lepton non-universality observables have been perceived in semileptonic B meson decay processes, both in the neutral-current (b→sll) and charged-current (b→clˉνl) transitions. Influenced by these fascinating quotients, we examine the semileptonic decays involving the b→clˉνl quark level transitions. We execute it through a model independent analysis in order to probe the nature of new physics. Taking into consideration the most general effective Hamiltonian, we scrutinize Λb→Λcτˉντ, B+c→ηcτ+ντ, and B→D∗∗τˉντ (where D∗∗={D∗0,D∗1,D1,D∗2} are the four lightest excited charm mesons) processes, in the presence of new physics. We perform a global fit to different sets of new coefficients, making use of the measurements on RD, RD∗, RJ/ψ, PD∗τ and the upper limit on Br(B+c→τ+ντ). We then inspect the effect of constrained new couplings on the branching ratios, forward-backward asymmetry parameters, lepton non-universality ratios (LNU), lepton and hadron polarization asymmetries of these decay modes.