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High Energy Physics - Phenomenology

arXiv:1503.03865 (hep-ph)
[Submitted on 12 Mar 2015 (v1), last revised 7 Aug 2015 (this version, v4)]

Title:Violation of lepton flavour universality in composite Higgs models

Authors:Christoph Niehoff, Peter Stangl, David M. Straub
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Abstract:We investigate whether the $2.6\sigma$ deviation from lepton flavour universality in $B^+\to K^+\ell^+\ell^-$ decays recently observed at the LHCb experiment can be explained in minimal composite Higgs models. We show that a visible departure from universality is indeed possible if left-handed muons have a sizable degree of compositeness. Constraints from $Z$-pole observables are avoided by a custodial protection of the muon coupling. The deficit in the invisible $Z$ width at LEP is explained in the same region of parameters.
Comments: 5 pages, 2 figures. v4: discussion of invisible Z width added
Subjects: High Energy Physics - Phenomenology (hep-ph)
Cite as: arXiv:1503.03865 [hep-ph]
  (or arXiv:1503.03865v4 [hep-ph] for this version)
  https://doi.org/10.48550/arXiv.1503.03865
Journal reference: Phys.Lett. B747 (2015) 182-186
Related DOI: https://doi.org/10.1016/j.physletb.2015.05.063

Submission history

From: David M. Straub [view email]
[v1] Thu, 12 Mar 2015 20:00:03 UTC (267 KB)
[v2] Mon, 16 Mar 2015 15:58:05 UTC (267 KB)
[v3] Wed, 3 Jun 2015 08:05:48 UTC (283 KB)
[v4] Fri, 7 Aug 2015 11:13:05 UTC (284 KB)
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