Combined explanations of B-physics anomalies: the sterile neutrino solution

Journal of High Energy Physics, Oct 2018

Abstract In this paper we provide a combined explanation of charged- and neutral-current B-physics anomalies assuming the presence of a light sterile neutrino NR which contributes to the B → D(*)τν processes. We focus in particular on two simplified models, where the mediator of the flavour anomalies is either a vector leptoquark U 1 μ ∼ (3, 1, 2/3) or a scalar leptoquark S1 ∼ (\( \overline{\mathbf{3}} \), 1, 1/3). We find that U 1 μ can successfully reproduce the required deviations from the Standard Model while being at the same time compatible with all other flavour and precision observables. The scalar leptoquark instead induces a tension between Bs mixing and the neutral-current anomalies. For both states we present the limits and future projections from direct searches at the LHC finding that, while at present both models are perfectly allowed, all the parameter space will be tested with more luminosity. Finally, we study in detail the cosmological constraints on the sterile neutrino NR and the conditions under which it can be a candidate for dark matter.

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Combined explanations of B-physics anomalies: the sterile neutrino solution

Journal of High Energy Physics October 2018, 2018:92 | Cite as Combined explanations of B-physics anomalies: the sterile neutrino solution AuthorsAuthors and affiliations Aleksandr AzatovDaniele BarducciDiptimoy GhoshDavid MarzoccaLorenzo Ubaldi Open Access Regular Article - Theoretical Physics First Online: 15 October 2018 7 Downloads Abstract In this paper we provide a combined explanation of charged- and neutral-current B-physics anomalies assuming the presence of a light sterile neutrino NR which contributes to the B → D(*)τν processes. We focus in particular on two simplified models, where the mediator of the flavour anomalies is either a vector leptoquark U 1 μ ∼ (3, 1, 2/3) or a scalar leptoquark S1 ∼ (\( \overline{\mathbf{3}} \), 1, 1/3). We find that U 1 μ can successfully reproduce the required deviations from the Standard Model while being at the same time compatible with all other flavour and precision observables. The scalar leptoquark instead induces a tension between Bs mixing and the neutral-current anomalies. For both states we present the limits and future projections from direct searches at the LHC finding that, while at present both models are perfectly allowed, all the parameter space will be tested with more luminosity. Finally, we study in detail the cosmological constraints on the sterile neutrino NR and the conditions under which it can be a candidate for dark matter. Keywords Phenomenological Models  ArXiv ePrint: 1807.10745 Download to read the full article text Notes Open Access This article is distributed under the terms of the Creative Commons Attribution License (CC-BY 4.0), which permits any use, distribution and reproduction in any medium, provided the original author(s) and source are credited. References [1] BaBar collaboration, J.P. Lees et al., Evidence for an excess of \( \overline{B}\to {D}^{\left(\ast \right)}{\tau}^{-}{\overline{\nu}}_{\tau } \) decays, Phys. Rev. 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Aleksandr Azatov, Daniele Barducci, Diptimoy Ghosh, David Marzocca, Lorenzo Ubaldi. Combined explanations of B-physics anomalies: the sterile neutrino solution, Journal of High Energy Physics, 2018, 92, DOI: 10.1007/JHEP10(2018)092