Faculty and Student Publications
Document Type
Article
Publication Date
5-1-2019
Abstract
© 2019, The Author(s). In order to explain the observed anomalies in the measurements of RD(∗) and RJ/ψ, a variety of new-physics (NP) models that contribute to b→ cτ−ν¯ have been proposed. In this paper, we show how CP-violating observables can be used to distinguish these NP models. Because p→ τ cannot be measured (the decay products of the τ include the undetected ντ), obtaining the angular distribution of B¯ → D∗ +τ−ν¯ τ is problematic. Instead, we focus here on B¯ → D∗ +(→ Dπ+) μ−ν¯ μ. This process may also receive contributions from the same NP, and LHCb intends to measure the CP-violating angular asymmetries in this decay. There are two classes of NP models that contribute to b→cμ−ν¯μ. These involve (i) a W′ (two types) or (ii) a leptoquark (LQ) (six types). The most popular NP models predict no CP-violating effects, so the measurement of nonzero CP-violating asymmetries would rule them out. Furthermore these measurements allow one to distinguish the W′ and LQ models, and to differentiate among several LQ models.
Relational Format
journal article
Recommended Citation
Bhattacharya, B., Datta, A., Kamali, S., & London, D. (2019). CP violation in $$ {\overline{B}}^0\to {D}^{\ast +}{\mu}^{-}{\overline{\nu}}_{\mu } $$. Journal of High Energy Physics, 2019(5), 191. https://doi.org/10.1007/JHEP05(2019)191