# $\bar B\to D\tau\bar \nu_\tau$ vs. $\bar B\to D\mu\bar \nu_\mu$

2 Groupe Théorie
LAL - Laboratoire de l'Accélérateur Linéaire, J. Stefan Institute
Abstract : Recent experimental results for the ratio of the branching fractions of $\bar B\to D^{(*)}\tau\bar \nu_\tau$ and $\bar B\to D^{(*)}\mu\bar \nu_\mu$ decays came as a surprise and lead to a discussion of possibility to constraining New Physics through these modes. Here we focus on ${\cal B}(\bar B\to D\tau\bar \nu_\tau)/{\cal B}(\bar B\to D\mu\bar \nu_\mu)$ and argue that the result is consistent with the Standard Model within $2\sigma$, and that the test of compatibility of this ratio with the Standard Model can be done experimentally with a minimal theory input.
Document type :
Journal articles
Domain :

http://hal.in2p3.fr/in2p3-00711113
Contributor : Sabine Starita <>
Submitted on : Friday, June 22, 2012 - 2:23:52 PM
Last modification on : Friday, January 8, 2021 - 12:00:03 PM

### Citation

D. Becirevic, N. Kosnik, A. Tayduganov. $\bar B\to D\tau\bar \nu_\tau$ vs. $\bar B\to D\mu\bar \nu_\mu$. Physics Letters B, Elsevier, 2012, 716, pp.208-213. ⟨10.1016/j.physletb.2012.08.016⟩. ⟨in2p3-00711113⟩

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