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      \(R_{K^{(*)}}\) with leptoquarks and the origin of Yukawa couplings

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          Abstract

          We construct a model where the Yukawa couplings of the Standard Model (SM) fermions arise from the breaking of a \(Z_2\) symmetry and through mixing with a fourth family of vector-like fermions. By adding a scalar leptoquark, which is an electroweak triplet and odd under the \(Z_2\) symmetry, we obtain an explanation for \(R_{K^{(*)}}\) that is linked to the origin of the Yukawa couplings. The coupling of SM fermions to the leptoquark is mediated by the fourth family fermions, and is predicted to be related to CKM entries and mass ratios of SM fermions.

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          New constraint on the existence of the μ+ → e+ γ decay.

          J. Adam, X Bai, A. Baldini … (2013)
          The analysis of a combined data set, totaling 3.6 × 10(14) stopped muons on target, in the search for the lepton flavor violating decay μ(+) → e(+)γ is presented. The data collected by the MEG experiment at the Paul Scherrer Institut show no excess of events compared to background expectations and yield a new upper limit on the branching ratio of this decay of 5.7 × 10(-13) (90% confidence level). This represents a four times more stringent limit than the previous world best limit set by MEG.
          Article 0 comments Cited 149 times – based on 0 reviews     Review now
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            Test of lepton universality with B 0 → K *0 ℓ + ℓ − decays

            R. Aaij, B. Adeva, M. Adinolfi … (2017)
            Article 0 comments Cited 109 times – based on 0 reviews     Review now
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              Test of lepton universality using \(B^{+}\rightarrow K^{+}\ell^{+}\ell^{-}\) decays

              N. Lopez-March, J. Lopes, I. Longstaff … (2014)
              A measurement of the ratio of the branching fractions of the \(B^{+}\rightarrow K^{+}\mu^{+}\mu^{-}\) and \(B^{+}\rightarrow K^{+}e^{+}e^{-}\) decays is presented using proton-proton collision data, corresponding to an integrated luminosity of 3.0 fb\(^{-1}\), recorded with the LHCb experiment at center-of-mass energies of 7 and 8 \(\mathrm{\,Te\kern -0.1em V}\). The value of the ratio of branching fractions for the dilepton invariant mass squared range \(1
              Article 0 comments Cited 106 times – based on 0 reviews
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                Author and article information

                Journal
                Publication date Created: 16 July 2018
                Article
                ArXiV ID: 1807.06023
                SO-VID: 20872613-4946-459e-9201-466fedc91d95
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                http://arxiv.org/licenses/nonexclusive-distrib/1.0/

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                Comments 15 pages, 2 figures
                Categories hep-ph

                ScienceOpen disciplines: High energy & Particle physics
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                ScienceOpen disciplines: High energy & Particle physics

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