Revisiting the high-scale validity of the type II seesaw model with novel LHC signature

Ghosh, Dilip Kumar; Ghosh, Nivedita; Saha, Ipsita; Shaw, Avirup

doi:10.1103/physrevd.97.115022

Cited by 41 publications

(35 citation statements)

References 67 publications

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“…Among these, type-I seesaw is the simplest possibility [54,55], which indicates the presence of heavy right handed (RH) neutrinos to yield correct light neutrino mass through additional Yukawa coupling with SM Higgs. This in turn may alter the Higgs vacuum stability condition at high scale (larger than the RH neutrino masses) with large neutrino Yukawa coupling [56][57][58][59][60][61][62][63][64][65][66][67][68]. Inclusion of an inert Higgs doublet along with right handed neutrinos can also generate the light neutrino mass radiatively [69].…”

Section: Introductionmentioning

confidence: 99%

“…In brief, we want to study a multipartite DM scenario which would be adversely affected by the non-zero light neutrino mass in terms of EW vacuum stability. Note that while the neutrino Yukawa coupling involving RH neutrinos and SM Higgs tends to destabilze the EW vacuum, the presence of the additional scalars in the set-up tends to stabilize it [56][57][58][59][60][61][62][63][64][65][66][67][68]. So, we take up an interesting exercise of validating the model from DM constraints, neutrino masses and high scale validity (absolute stability of the Higgs vacuum and perturbativity).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Two component dark matter with inert Higgs doublet: neutrino mass, high scale validity and collider searches

Bhattacharya

Ghosh

Saha

et al. 2020

J. High Energ. Phys.

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The idea of this work is to investigate the constraints on the dark matter (DM) allowed parameter space from high scale validity (absolute stability of Higgs vacuum and perturbativity) in presence of multi particle dark sector and heavy right handed neutrinos to address correct neutrino mass. We illustrate a simple two component DM model, consisting of one inert SU (2) L scalar doublet and a scalar singlet, both stabilised by additional Z 2 ×Z 2 symmetry, which also aid to vacuum stability. We demonstrate DM-DM interaction helps achieving a large allowed parameter space for both the DM components by evading direct search bound. High scale validity puts further constraints on the model, for example, on the mass splitting between the charged and neutral component of inert doublet, which has important implication to its leptonic signature(s) at the Large Hadron Collider (LHC).

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Two component dark matter with inert Higgs doublet: neutrino mass, high scale validity and collider searches

Bhattacharya

Ghosh

Saha

et al. 2020

J. High Energ. Phys.

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“…The presence of a doubly charged scalar in the spectrum is typical signature of a type II seesaw mechanism [78][79][80][81][82][83][84][85][86]. Typically, this type II seesaw is realized by the addition of a scalar triplet.…”

Section: Searches For a Doubly Charged Scalar At The Lhcmentioning

confidence: 99%

Lepton flavor violation and collider searches in a type I + II seesaw model

et al. 2019

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Neutrino are massless in the Standard Model. The most popular mechanism to generate neutrino masses are the type I and type II seesaw, where right-handed neutrinos and a scalar triplet are augmented to the Standard Model, respectively. In this work, we discuss a model where a type I + II seesaw mechanism naturally arises via spontaneous symmetry breaking of an enlarged gauge group. Lepton flavor violation is a common feature in such setup and for this reason, we compute the model contribution to the µ → eγ and µ → 3e decays. Moreover, we explore the connection between the neutrino mass ordering and lepton flavor violation in perspective with the LHC, HL-LHC and HE-LHC sensitivities to the doubly charged scalar stemming from the Higgs triplet. Our results explicitly show the importance of searching for signs of lepton flavor violation in collider and muon decays. The conclusion about which probe yields stronger bounds depends strongly on the mass ordering adopted, the absolute neutrino masses and which much decay one considers. In the 1 − 5 TeV mass region of the doubly charged scalar, lepton flavor violation experiments and colliders offer orthogonal and complementary probes. Thus if a signal is observed in one of the two new physics searches, the other will be able to assess whether it stems from a seesaw framework.

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“…Another scenario where doubly-charged Higgs decays to same-sign W ± boson pairs. The collider signatures and the discovery prospects of this scenario have been discussed in [38][39][40], and [41,42].…”

Section: Introductionmentioning

confidence: 99%

Probing doubly and singly charged Higgs bosons at the pp collider HE-LHC

et al. 2020

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We analyse the signal sensitivity of multi-lepton final states at collider that can arise from doubly and singly charged Higgs decay in a type-II seesaw framework. We assume triplet vev to be very small and degenerate masses for both the charged Higgs states. The leptonic branching ratio of doubly and singly charged Higgs states have a large dependency on the neutrino oscillation parameters, lightest neutrino mass scale, as well as neutrino mass hierarchy.We explore this as well as the relation between the leptonic branching ratios of the singly and doubly charged Higgs states in detail. We evaluate the effect of these uncertainties on the production cross-section. Finally, we present a detailed analysis of multi-lepton final states for a future hadron collider HE-LHC, that can operate with center of mass energy √ s = 27 TeV.

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Revisiting the high-scale validity of the type II seesaw model with novel LHC signature

Cited by 41 publications

References 67 publications

Two component dark matter with inert Higgs doublet: neutrino mass, high scale validity and collider searches

Two component dark matter with inert Higgs doublet: neutrino mass, high scale validity and collider searches

Lepton flavor violation and collider searches in a type I + II seesaw model

Probing doubly and singly charged Higgs bosons at the pp collider HE-LHC

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