Unbinned Angular Analysis of $B\to D^*(D\pi)\ell \nu_\ell$ and $C_{V_R}$

TL;DR

This paper presents a sensitivity study on unbinned angular analysis of B meson decays, demonstrating precise measurement of the right-handed vector current coefficient, independent of the V_{cb} puzzle.

Contribution

It introduces a method to measure the Wilson coefficient C_{V_R} with 2-4% precision using angular observables in B decay analysis.

Findings

C_{V_R} can be measured with 2-4% precision.

Angular observables are independent of the V_{cb} puzzle.

The analysis uses 10 w bins for the measurement.

Abstract

A sensitivity study of the unbinned angular analysis of the $B\to D^*(D\pi)\ell \nu_\ell$ decay is presented. In the analysis, it is shown that the Wilson coefficient of the right-handed vector current, $C_{V_R}$, can be measured to precision of 2-4$\%$ using either the full set of normalised angular observables or the forward-backward asymmetry $A_{FB}$ of the charged lepton in 10 $w$ bins. Such angular measurements are independent of the $V_{cb}$ puzzle.