New results on semileptonic b decays from LHCb

TL;DR

This paper presents the most precise measurement of B0 mixing frequency and the first determination of |V_ub| from baryonic decays, providing new insights into semileptonic b decays and CKM matrix elements.

Contribution

It reports the most precise B0 mixing measurement and the first |V_ub| determination from baryonic decays, advancing understanding of semileptonic b decays.

Findings

Most precise B0 mixing frequency measurement

First |V_ub| determination from baryonic decays

Provides constraints on CKM matrix and decay discrepancies

Abstract

We report new measurements, based on the Run I dataset collected by the LHCb experiment, of the B0 mixing frequency Dm_d and the CKM matrix element |V_ub| using semileptonic b decays. The former is the most precise measurement ever performed; the latter represents the first determination of |V_ub| using a baryonic decay, and adds an important constraint on a possible explanation for the discrepancy between exclusive and inclusive determinations of this observable.