Testing Higgs triplet model and neutrino mass patterns

Chun, Eung Jin; Lee, Kang Young; Park, Seong Chan

doi:10.1016/s0370-2693(03)00770-6

Cited by 193 publications

(258 citation statements)

References 36 publications

Supporting

Mentioning

246

Contrasting

Order By: Relevance

“…In addition to the singlet state (1) T , we have 10 neutral states from (44) ij , in which { (44) 11 +(44) 22 66 } show different property under the transformation of χ ++ χ −− ↔ χ 0 χ 0 , and χ + χ − ↔ ξ + ξ − . The first two states have completely the same property as that of the singlet state (1) T , so that the appropriate linear combination of these three states give the three eigenstates.…”

Section: Neutral Channelsmentioning

confidence: 99%

Unitarity bounds in the Higgs model including triplet fields with custodial symmetry

Aoki

Kanemura

2008

Phys. Rev. D

View full text Add to dashboard Cite

We study bounds on Higgs boson masses from perturbative unitarity in the Georgi-Machacek model, whose Higgs sector is composed of a scalar isospin doublet, a real and a complex isospin triplet fields. This model can be compatible with the electroweak precision data without fine tuning because of the imposed global SU (2) R symmetry in the Higgs potential, by which the electroweak rho parameter is unity at the tree level. All possible two-body elastic-scattering channels are taken into account to evaluate the S-wave amplitude matrix, and then the condition of perturbative unitarity is imposed on the eigenvalues to obtain constraint on the Higgs parameters. Masses of all scalar bosons turn out to be bounded from above, some of which receive more strict upper bounds as compared to that in the standard model (712 GeV). In particular, the upper bound of the lightest scalar boson, whatever it would be, is about 270 GeV.

show abstract

Section: Neutral Channelsmentioning

confidence: 99%

Unitarity bounds in the Higgs model including triplet fields with custodial symmetry

Aoki

Kanemura

2008

Phys. Rev. D

View full text Add to dashboard Cite

show abstract

“…Due to the ignorance of v L the magnitude of h ij cannot be predicted and so the HTM can only accommodate observable BRs for τ → l i l j l k . However, unlike the LR symmetric model, the HTM provides predictions for the ratios of τ → l i l j l k [36] with are distinct for each of the various neutrino mass patterns NH, IH and DG. The necessary suppression of BR(µ → eee) relative to BR(τ → lll) requires h eµ to be sufficiently small.…”

Section: Higgs Triplet Modelmentioning

confidence: 99%

“…As in CASE I Eq. (47), this is arranged by invoking a cancellation between two terms contributing to h eµ , one depending on θ 13 and the other depending on both θ 12 and r = ∆m 2 12 /∆m 2 13 [36], [37]. Observation of τ → lll would restrict θ 13 to a narrow interval which can be predicted in terms of θ 12 and r. For the case of NH neutrinos θ 13 ∼ √ r while for IH and DG neutrinos θ 13 ∼ r. Since current oscillation data suggests r ≈ 0.04, the value of θ 13 need to ensure small h eµ is of the order 0.1 for NH and 0.01 for IH and DG.…”

Section: Higgs Triplet Modelmentioning

confidence: 99%

Lepton flavor violatingτdecays in the left-right symmetric model

2007

View full text Add to dashboard Cite

The Left-Right symmetric extension of the Standard Model with Higgs isospin triplets can provide neutrino masses via a TeV scale seesaw mechanism. The doubly charged Higgs bosons H ±± L and H ±± R induce lepton flavour violating decays τ ± → lll at tree-level via a coupling which is related to the Maki-Nakagawa-Sakata matrix (V MNS ). We study the magnitude and correlation of τ ± → lll and µ → eγ with specific assumptions for the origin of the large mixing in V MNS while respecting the stringent bound for µ → eee. It is also shown that an angular asymmetry for τ ± → lll is sensitive to the relative strength of the H ±± L and H ±± R mediated contributions and provides a means of distinguishing models with doubly charged Higgs bosons.

show abstract

“…Alternatively, the decay into a pair of same-sign W bosons, i.e. ∆ ++ → W + W + , is dominant in a complementary region of the parameter space, which -though more challenging from the viewpoint of background elimination -can unravel a doubly-charged scalar [14][15][16][17][18][19][20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Doubly charged scalar decays in a type II seesaw scenario with two Higgs triplets

Chaudhuri

Grimus

Mukhopadhyaya

2014

J. High Energ. Phys.

View full text Add to dashboard Cite

The type II seesaw mechanism for neutrino mass generation usually makes use of one complex scalar triplet. The collider signature of the doubly-charged scalar, the most striking feature of this scenario, consists mostly in decays into same-sign dileptons or same-sign W boson pairs. However, certain scenarios of neutrino mass generation, such as those imposing texture zeros by a symmetry mechanism, require at least two triplets in order to be consistent with the type II seesaw mechanism. We develop a model with two such complex triplets and show that, in such a case, mixing between the triplets can cause the heavier doubly-charged scalar mass eigenstate to decay into a singly-charged scalar and a W boson of the same sign. Considering a large number of benchmark points with different orders of magnitude of the ∆L = 2 Yukawa couplings, chosen in agreement with the observed neutrino mass and mixing pattern, we demonstrate that H ++ 1 → H + 2 W + can have more than 99% branching fraction in the cases where the vacuum expectation values of the triplets are small. It is also shown that the above decay allows one to differentiate a two-triplet case at the LHC, through the ratios of events in various multi-lepton channels.

show abstract

Testing Higgs triplet model and neutrino mass patterns

Cited by 193 publications

References 36 publications

Unitarity bounds in the Higgs model including triplet fields with custodial symmetry

Unitarity bounds in the Higgs model including triplet fields with custodial symmetry

Lepton flavor violatingτdecays in the left-right symmetric model

Doubly charged scalar decays in a type II seesaw scenario with two Higgs triplets

Contact Info

Product

Resources

About