Measurement of the shape of the $\Lambda_b^0\to\Lambda_c^+ \mu^- \overline{\nu}$ differential decay rate

TL;DR

This paper measures the shape of the differential decay rate and Isgur-Wise function for the decay $ ext{Lambda}_b^0 o ext{Lambda}_c^+ ext{mu}^- ar{ u}$ using LHCb data, testing heavy-quark theory and lattice QCD predictions.

Contribution

It provides the first detailed measurement of the decay rate shape and Isgur-Wise function for this baryonic decay, comparing results with theoretical models.

Findings

Measured $q^2$ dependence of decay rate

Compared results with heavy-quark effective theory

Compared results with lattice QCD predictions

Abstract

A measurement of the shape of the differential decay rate and the associated Isgur-Wise function for the decay $\Lambda_b^0\to\Lambda_c^+\mu^-\overline{\nu}$ is reported, using data corresponding to $3 fb^{-1}$ collected with the LHCb detector in proton-proton collisions. The $\Lambda_c^+\mu^-\overline{\nu}$(+ anything) final states are reconstructed through the detection of a muon and a $\Lambda_c^+$ baryon decaying into $pK^-\pi^+$, and the decays $\Lambda_b^0\to\Lambda_c^+\pi^+\pi^-\mu^-\overline{\nu}$ are used to determine contributions from $\Lambda_b^0\to \Lambda_c^{\star+}\mu ^-\bar{\nu}$ decays. The measured dependence of the differential decay rate upon the squared four-momentum transfer between the heavy baryons, $q^2$, is compared with expectations from heavy-quark effective theory and from unquenched lattice QCD predictions.