Lepton flavor violating decays<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>τ</mml:mi><mml:mo>→</mml:mo><mml:mover accent="true"><mml:mi>l</mml:mi><mml:mo>¯</mml:mo></mml:mover><mml:mi>l</mml:mi><mml:mi>l</mml:mi></mml:math>and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>μ</mml:mi><mml:mo>→</mml:mo><mml:mi>e</mml:mi><mml:mi>γ</mml:mi></mml:math>in the Higgs triplet model

Akeroyd, A. G.; Aoki, M.; Sugiyama, Hiroaki

doi:10.1103/physrevd.79.113010

Cited by 124 publications

(121 citation statements)

References 101 publications

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“…This result matches the well-known result for the Higgs triplet contribution derived in [211] and quoted in [212][213][214]. Thus, if one needs a more general assessment of the doubly charged contribution to g − 2 and µ → eγ, Eq.…”

Section: Neutral Scalarsupporting

confidence: 77%

A call for new physics: The muon anomalous magnetic moment and lepton flavor violation

2018

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We review how the muon anomalous magnetic moment (g − 2) and the quest for lepton flavor violation are intimately correlated. Indeed the decay µ → eγ is induced by the same amplitude for different choices of in-and outgoing leptons. In this work, we try to address some intriguing questions such as:Which hierarchy in the charged lepton sector one should have in order to reconcile possible signals coming simultaneously from g − 2 and lepton flavor violation?What can we learn if the g − 2 anomaly is confirmed by the upcoming flagship experiments at FERMILAB and J-PARC, and no signal is seen in the decay µ → eγ in the foreseeable future? On the other hand, if the µ → eγ decay is seen in the upcoming years, do we need to necessarily observe a signal also in g − 2?.In this attempt, we generally study the correlation between these observables in a detailed analysis of simplified models. We derive master integrals and

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Section: Neutral Scalarsupporting

confidence: 77%

A call for new physics: The muon anomalous magnetic moment and lepton flavor violation

2018

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“…The parameter space of M ν to be probed with such processes in ongoing and planned experiments has been discussed in Ref. [46]. Using the experimental limits on LFV processes and the muon anomalous magnetic dipole moment and assuming degenerate heavy scalars for simplicity, Ref.…”

Section: Constraints On Parameters In Type II Seesawmentioning

confidence: 99%

LHC phenomenology of the type II seesaw mechanism: Nondegenerate case

2015

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In this paper, we thoroughly investigate the LHC phenomenology of the type II seesaw mechanism for neutrino masses in the nondegenerate case where the triplet scalars of various charge (H ±± , H ± , H 0 , A 0 ) have different masses. Compared with the degenerate case, the cascade decays of scalars lead to many new, interesting signal channels. In the positive scenario where M H ±± < M H ± < M H 0 /A 0 , the four-lepton signal is still the most promising discovery channel for the doubly-charged scalars H ±± . The five-lepton signal is crucial to probe the mass spectrum of the scalars, for which, for example, a 5σ reach at 14 TeV LHC for M H ± = 430 GeV with M H ±± = 400 GeV requires an integrated luminosity of 76 fb −1 . And the six-lepton signal can be used to probe the neutral scalars H 0 /A 0 , which are usually hard to detect in the degenerate case. In the negative scenario where M H ±± > M H ± > M H 0 /A 0 , the detection of H ±± is more challenging, when the cascade decay H ±± → H ± W ± * is dominant. The most important channel is the associated H ± H 0 /A 0 production in the final state ± E T b bb b, which requires a luminosity of 109 fb −1 for a 5σ discovery, while the final state ± E T b bτ + τ − is less promising. Moreover, the associated H 0 A 0 production can give same signals as the standard model Higgs pair production. With a much larger cross section, the H 0 A 0 production in the final state b bτ + τ − could reach 3σ significance at 14 TeV LHC with a luminosity of 300 fb −1 . In summary, with an integrated luminosity ∼ O(500 fb −1 ), the triplet scalars can be fully reconstructed at 14 TeV LHC in the negative scenario.

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“…These Yukawa coupling constants can induce lepton flavorviolating processes. Hence, the combination of the doubly charged Higgs boson mass and the triplet VEV (roughly ∼ m ∆ ±± v ∆ ) can be constrained by LFV data [28]. In order to satisfy the LFV constraint, either heavy triplets or large triplet VEV (or both) is required.…”

Section: Models With Doubly Charged Higgs Bosonsmentioning

confidence: 99%

Search for doubly charged Higgs bosons using the same-sign diboson mode at the LHC

2012

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Doubly charged Higgs bosons are predicted in many new physics models with an extended Higgs sector that contains a Higgs triplet field. Current experimental searches have been focusing mainly on the scenario in which the same-sign dilepton decay modes are the dominant ones. We study the scenario where the vacuum expectation value of the triplet field is sufficiently large so that the associated charged Higgs bosons decay dominantly to a pair of weak gauge bosons instead. A detailed simulation of the signal and the backgrounds is performed for the CERN Large Hadron Collider at the collision energy of 8 TeV and 14 TeV. We find that different cuts should be imposed for the events, depending on whether the doubly charged Higgs boson mass is greater than about 200 GeV. In the higher mass region, the forward jet tagging proves to be useful in enhancing the signal significance. We show the discovery reach of the LHC running at 8 and 14 TeV, with two benchmark triplet vacuum expectation values. With an integrated luminosity of 10 fb −1 at 8 TeV, the doubly charged Higgs boson with a mass of ∼ 180 GeV can be tested at 5σ level in such a scenario.

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Lepton flavor violating decaysτ→l¯llandμ→eγin the Higgs triplet model

Cited by 124 publications

References 101 publications

A call for new physics: The muon anomalous magnetic moment and lepton flavor violation

A call for new physics: The muon anomalous magnetic moment and lepton flavor violation

LHC phenomenology of the type II seesaw mechanism: Nondegenerate case

Search for doubly charged Higgs bosons using the same-sign diboson mode at the LHC

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