Neutrino mass hierarchy and Majorana CP phases within the Higgs triplet model at the LHC

Garayoa, Julia; Schwetz, Thomas

doi:10.1088/1126-6708/2008/03/009

Cited by 131 publications

(110 citation statements)

References 65 publications

(102 reference statements)

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“…The above results hold in the simple limits of HI, IH and QD neutrino masses with θ 13 = 0. A complete study including the dependence on the lightest neutrino mass and CPV phases can be found in (Garayoa and Schwetz, 2008). The possibility of extracting information on the Majorana phases from the doubly-charged Higgs decays into leptons has been addressed in (Akeroyd et al, 2008) and the connection with neutrinoless double beta decay in (Petcov et al, 2009).…”

Section: E Impact Of Lcpv At Collidersmentioning

confidence: 99%

LeptonicCPviolation

Branco¹,

Felipe

Joaquim³

2012

Rev. Mod. Phys.

205

188

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Several topics on CP violation in the lepton sector are reviewed. A few theoretical aspects concerning neutrino masses, leptonic mixing, and CP violation will be covered, with special emphasis on seesaw models. A discussion is provided on observable effects which are manifest in the presence of CP violation, particularly, in neutrino oscillations and neutrinoless double beta decay processes, and their possible implications in collider experiments such as the LHC. The role that leptonic CP violation may have played in the generation of the baryon asymmetry of the Universe through the mechanism of leptogenesis is also discussed.

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Section: E Impact Of Lcpv At Collidersmentioning

confidence: 99%

LeptonicCPviolation

Branco¹,

Felipe

Joaquim³

2012

Rev. Mod. Phys.

205

188

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“…which arise as a consequence of the mass hierarchy and mixing pattern [15,16,73]. The main irreducible background for this signal channel is…”

Section: Lhc Signatures In the Positive Scenariomentioning

confidence: 99%

“…To discern the underlying physics that is responsible for neutrino masses, it is vital to produce directly the relevant heavy particles at colliders and study their properties [11][12][13][14][15][16][17][18][19][20][21][22][23][24]. In this paper, we will study the LHC phenomenology of the type II seesaw mechanism.…”

Section: Introductionmentioning

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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“…On the other hand, in the scenario with two scalar triplets with charged mass eigenstates H ++ k and H + l (k, l = 1, 2), the decay amplitude for H ++ 1 → H + 2 W + , if kinematically allowed, is controlled by the SU(2) gauge coupling. Therefore, if one identifies regions of the parameter space where it dominates, one needs to devise new search strategies at the LHC [36][37][38][39][40][41][42][43][44], including ways of eliminating backgrounds.…”

Section: Jhep02(2014)060mentioning

confidence: 99%

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

Chaudhuri

Grimus

Mukhopadhyaya

2014

J. High Energ. Phys.

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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.

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Neutrino mass hierarchy and Majorana CP phases within the Higgs triplet model at the LHC

Cited by 131 publications

References 65 publications

LeptonicCPviolation

LeptonicCPviolation

LHC phenomenology of the type II seesaw mechanism: Nondegenerate case

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

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