Neutrino and Z′ phenomenology in an anomaly-free U(1) extension: role of higher-dimensional operators

Choudhury, Debajyoti; Deka, Kuldeep; Mandal, Tanumoy; Sadhukhan, Soumya

doi:10.1007/jhep06(2020)111

Cited by 20 publications

(8 citation statements)

References 102 publications

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“…[39] is dedicated to the search of heavy triplet leptons in the context of type-III seesaw mechanism. To constrain 30 the parameter space of the simplified type-V scenario, we performed a multilepton search similar to the search in ref. [39].…”

Section: Jhep06(2021)084mentioning

confidence: 99%

“…31 Although the 95% CL CMS observed upper limits (see figure 11 of ref. [39]) on the total pair production cross-sections of triplet fermions in type-III seesaw, being highly dependent on the production and decays of the triplet fermions in type-III seesaw, can not be applicable for other models, 32 one can always obtain 95% CL upper limits on the total pair production cross-sections of exotic fermions in a different model which also gives rise to multilepton final states by using the CMS observed number of 30 While the productions and subsequent decays of the exotic fermions in our model as well as type-III seesaw scenario give rise to multilepton final states, the CMS multilepton search limits on the masses of heavy triplet leptons in type-III seesaw model are not trivially applicable to limit the masses of triplet, quadruplet and quintuplet fermions in the present scenario. 31 Even the productions and decays of the triplet exotics in this model are very different from the production and decays of type-III seesaw triplets.…”

Section: Bounds From the Cms Multilepton Search At The Lhcmentioning

confidence: 99%

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A genuine fermionic quintuplet seesaw model: phenomenological introduction

Ashanujjaman

Ghosh

2021

J. High Energ. Phys.

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We study a model which generates Majorana neutrino masses at tree-level via low-energy effective operator with mass-dimension-9. Introduction of such a higher dimensional operator brings down the lepton number violating mass scale to TeV making such model potentially testable at present or near future colliders. This model possesses several new SU(2)L fermionic multiplets, in particular, three generations of triplets, quadruplets and quintuplets, and thus a rich phenomenology at the LHC. Noting that lepton flavour violation arises very naturally in such setup, we put constraints on the Yukawa couplings and heavy fermion masses using the current experimental bounds on lepton flavour violating processes. We also obtain 95% CL lower bounds on the masses of the triplets, quadruplets and quintuplets using a recent CMS search for multilepton final states with 137 inverse femtobarn integrated luminosity data at 13 TeV center of mass energy. The possibility that the heavy fermions could be long-lived leaving disappearing charge track signatures or displaced vertex at the future colliders like LHeC, FCC-he, MATHUSLA, etc. is also discussed.

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Section: Jhep06(2021)084mentioning

confidence: 99%

Section: Bounds From the Cms Multilepton Search At The Lhcmentioning

confidence: 99%

A genuine fermionic quintuplet seesaw model: phenomenological introduction

Ashanujjaman

Ghosh

2021

J. High Energ. Phys.

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“…In Eq. (35), the decay width of the new gauge boson Z into the two-body states is given under the assumption (47) as…”

Section: Constraintsmentioning

confidence: 99%

Flipped U(1) extended standard model and Majorana dark matter

Nam

2020

Eur. Phys. J. C

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We propose a general flavor-independent extension of the Standard Model (SM) with the minimal particle content, based on the symmetry $$SU(3)_C\times SU(2)_L\times U(1)_{Y'}\times U(1)_X\times Z_2$$ S U ( 3 ) C × S U ( 2 ) L × U ( 1 ) Y ′ × U ( 1 ) X × Z 2 . In this scenario, the charge operator is identified in terms of the charges of two U(1) gauge symmetries. The light neutrino masses are generated via Type-I seesaw mechanism only with two heavy right-handed neutrinos acquiring their Majorana masses through the $$U(1)_{Y'}\times U(1)_X$$ U ( 1 ) Y ′ × U ( 1 ) X symmetry breaking. We study various experimental constraints on the parameters of the model and investigate the phenomenology of the right-handed neutrino dark matter (DM) candidate assigned a $$Z_2$$ Z 2 -odd parity. We find that the most important constraints are the observed DM relic abundance, the current LHC limits, and the ambiguity of the SM neutral gauge boson mass.

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“…The absence of any new resonances at the LHC strongly suggests that any new physics (NP) explanation of the extant discrepancies would require the operative scale Λ to be at least a few TeVs or larger. Thankfully, even such a little hierarchy between Λ and the electroweak scale validates the use of an effective field theory (EFT) to address these discrepancies [22][23][24][25]. While a given ultraviolet-complete theory would yield, on the heavy fields being integrated out, a very specific structure for the ensuing EFT (in other words, specific relations between the Wilson coefficients), in the absence of such a theoretically motivated completion, the coefficients are completely independent.…”

Section: Introductionmentioning

confidence: 96%

Anomalous gauge couplings vis-$\grave{a}$-vis $(g-2)_μ$ and flavor observables

Choudhury¹,

Deka²,

Maharana³

et al. 2022

Preprint

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We reassess non-standard triple gauge couplings in the light of the recent (g − 2)µ measurement at FNAL, the new lattice theory result of (g − 2)µ and the updated measurements of several Bdecay modes. In the framework of SMEFT, three bosonic dimension-6 operators are invoked to parametrize physics beyond the Standard Model and their contributions to such low-energy observables computed. Constraints on the corresponding Wilson coefficients are then derived from fits to the current experimental bounds on the observables and compared with the most stringent ones available from the 13 TeV LHC data in the W + W − and W ± Z production channels.I.

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Neutrino and Z′ phenomenology in an anomaly-free U(1) extension: role of higher-dimensional operators

Cited by 20 publications

References 102 publications

A genuine fermionic quintuplet seesaw model: phenomenological introduction

A genuine fermionic quintuplet seesaw model: phenomenological introduction

Flipped U(1) extended standard model and Majorana dark matter

Anomalous gauge couplings vis-$\grave{a}$-vis $(g-2)_μ$ and flavor observables

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