Flavor-changing interactions mediated by scalars at the weak scale

Antaramian, Aram; Hall, Lawrence J.; Rašin, Andrija

doi:10.1103/physrevlett.69.1871

Cited by 142 publications

(145 citation statements)

References 6 publications

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“…However, we stress that it might be the first indication of a more complex scalar structure. Moreover, since Cheng-Sher flavor structures emerge from flavor symmetries, these data might even reveal the presence of a fundamental flavor symmetry [49].…”

Section: Discussionmentioning

confidence: 99%

Explaining the CMS Higgs flavor-violating decay excess

Sierra

Vicente

2014

Phys. Rev. D

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Direct searches for lepton flavor violating Higgs boson decays in the τ µ channel have been recently reported by the CMS collaboration. The results display a slight excess of signal events with a significance of 2.5σ, which translates into a branching ratio of about 1%. By interpreting these findings as a hint for beyond the standard model physics, we show that the Type-III 2HDM is capable of reproducing such signal while at the same time satisfying boundedness from below of the scalar potential, perturbativity, electroweak precision data, measured Higgs standard decay modes and low-energy lepton flavor violating constraints. We have found that the allowed signal strength ranges for the bb, W W * and ZZ * standard channels shrink as soon as BR(h → τ µ) ∼ 1% is enforced. Thus, we point out that if the excess persists, improved measurements of these channels may be used to test our Type-III 2HDM scenario.

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Section: Discussionmentioning

confidence: 99%

Explaining the CMS Higgs flavor-violating decay excess

Sierra

Vicente

2014

Phys. Rev. D

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“…In Ref. [47], it was suggested that this "approximate flavour symmetry" may be a property of the low energy effective theory derived from any extension of the standard model. In this case, the dilepton-lepton coupling matrix would be of the form…”

Section: Flavour Infiltrationmentioning

confidence: 99%

Bileptons: present limits and future prospects

1998

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We define bileptons to be bosons coupling to a pair of leptons and construct the most general dimension four lagrangian involving scalar and vector bileptons. We concentrate on fields with lepton number 2, and derive model independent bounds on their masses and couplings from low-energy data. In addition, we study their signals in high energy experiments and forecast the discovery potential of future colliders.

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“…It is often said that the obtained flavour conservation is "natural". The inclusion of discrete symmetries, however, is not the only way of preventing the undesired FCNC [9][10][11]. In fact, the presence of strong hierarchies in the fermion masses and mixing angles seems to be a clear signature of an underlying theory of flavour beyond the SM Yukawa couplings.…”

Section: Introductionmentioning

confidence: 99%

“…On the other hand, whereas the phenomenological constraints on FCNC are very stringent for processes which involve the first family of quarks and leptons, this is not the case if one considers only the mixing between the second and third fermion families. One possibility is to assume that the suppression of FCNC is related to the masses of the involved fermions, as has been proposed by several authors in the literature [10,11].…”

Section: Introductionmentioning

confidence: 99%