New physics search via angular distribution of $B\to D^{\ast }\ell \hat{I}{½}_{\ell }$ decay in the light of the new lattice data

Abstract

In this article, we investigate the potential of the angular distribution of the $B\to D^{\ast }\ell \hat{I}{½}_{\ell }$ process to search for new physics signals. The Belle collaboration has analysed it to constraint $V_{cb}$ and the $B\to D^{\ast }$ form factors, under the assumption of the Standard Model. With the newly released lattice QCD data, we can perform a simultaneous fit of the form factors, $V_{cb}$ as well as new physics parameters. We use the Belle data and the lattice data to constrain right-handed new physics. In addition, we also generate unbinned pseudo-dataset and perform a sensitivity study on more general new physics models, using the lattice data.

37 pages, 14 figures, 10 tables; added references and corrected typos