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

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