Explaining 
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Ko, Pyungwon; Nomura, Takaaki; Okada, Hiroshi

doi:10.1103/physrevd.95.111701

Cited by 61 publications

(37 citation statements)

References 39 publications

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“…In addition, such family nonuniversal neutral gauge boson is also motivating from flavour anomalies point of view. Several proposals have appeared in the literature in order to accommodate the reported anomalies in B-meson systems by incorporating additional flavoured gauge bosons; see, for example [38][39][40][41][42][43][44].…”

Section: Introductionmentioning

confidence: 99%

Flavoured gauge extension of singlet-doublet fermionic dark matter: neutrino mass, high scale validity and collider signatures

Barman

Borah

Ghosh

et al. 2019

J. High Energ. Phys.

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We propose an Abelian gauged version of the singlet-doublet fermionic dark matter (DM) model where DM, combination of a vector like fermion doublet and a fermion singlet, is naturally stabilised by the gauge symmetry without requiring any ad-hoc discrete symmetries. In order to have good detection prospects at collider experiments like the large hadron collider (LHC) and enlarged parameter space for low mass DM, we consider the additional gauge symmetry to be based on the quantum B − 3L τ where the restriction to third generation of leptons is chosen to have weaker bounds from the LHC on the corresponding gauge boson. The triangle anomalies arising in this model can be can cancelled by including a right handed neutrino which takes part in generating light neutrino masses through type I seesaw mechanism. Apart from DM, collider prospects and light neutrino masses, the model also offers high scale validity giving rise to a stable electroweak vacuum and perturbative couplings all the way up to the Planck scale. We constrain our model parameters from these requirements as well as existing relevant constraints related to DM and colliders. * bb1988@iitg.ac.in † dborah@iitg.ac.in ‡ Apart from DM, neutrino and collider prospects, the model comes up with additional advantage of providing a solution to the metastable nature of electroweak vacuum [47-54]. The negative fermionic contribution (primarily due to top quark and VLFs) to the renormalisation group (RG) running of the Higgs quartic coupling is compensated by respective contributions from additional scalars in the model 2 . In particular, the constraints from the requirement of vacuum stability restricts the gauge coupling of TeV scale B − 3L τ gauge symmetry to g B−3Lτ < ∼ 0.25 and SM Higgs coupling with VLF to Y < ∼ 0.3. For such couplings, the model also remains perturbative all the way upto the Planck scale. This paper is organised as follows: In section II we have introduced the new particles in our model and their interaction Lagrangian. In section III we have discussed the constraints on the model parameters arising from stability, unitarity and perturbativity of the scalar potential, electroweak precision observables, LHC searches and generation of light neutrino mass requirements. The details of the parameter space scan for the DM phenomenology is elaborated in section IV where in subsection IV A we have illustrated the relic density allowed parameter space and in subsection IV B direct search is discussed. The high scale validity and perturbativity of the model is elaborated in section V, where we have also chosen some of the benchmark points satisfying all relevant constraints in order to perform the collider analysis. The collider signatures of the model, along with discovery potential in the LHC is thoroughly explained in section VI. Finally in section VII we have concluded and summarised our findings. II. THE MODEL: FIELDS AND INTERACTIONSWe first tabulate all the particles of the model in table I with their corresponding gauge charges.On top of the fam...

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Section: Introductionmentioning

confidence: 99%

Flavoured gauge extension of singlet-doublet fermionic dark matter: neutrino mass, high scale validity and collider signatures

Barman

Borah

Ghosh

et al. 2019

J. High Energ. Phys.

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“…A flavor dependent gauge symmetry is one of the promising candidates for new physics to describe the anomalies and other phenomenologies related with the flavor physics as well as to ensure the dark matter (DM) stability. In particular, the model of U(1) µ−τ provides several phenomenological prescriptions to resolve, namely, muon anomalous magnetic moment [1], 1 experimental anomalies of semileptonic B-meson decay [2,3], neutrino sector [4][5][6][7][8][9][10][11][12][13][14][15], and other related topics [16,17]. Among them, the B-meson decay anomaly is a very challenging topic due to some indications of new physics have been suggested in the B physics.…”

Section: Introductionmentioning

confidence: 99%

“…In previous study of Ref. [2], we have proposed the flavor dependent gauge symmetry. This has successfully explained the anomaly of B → K * ℓ + ℓ − decay through generating the flavor violating Z ′ boson interactions at one loop level.…”

Section: Introductionmentioning

confidence: 99%

“…We then perform a more detailed analysis in which we take into account the decay width of the Z ′ boson which is related with the relic density of the DM, the constraints from the spin independent DM-nucleon elastic scattering cross section mediated by the vectorlike quarks Q ′ a at tree level, the large electron-positron (LEP) collider, and the large hadron collider (LHC), to improve the previous analyses of Ref. [2]. In our present numerical analysis, we find that the allowed regions of the DM and Z ′ masses are narrower than that of the previous analysis.…”

Section: Introductionmentioning

confidence: 99%

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Dark matter and B -meson anomalies in a flavor dependent gauge symmetry

Hutauruk

Nomura²,

Okada

et al. 2019

Phys. Rev. D

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A possibility of explaining the anomalies in the semileptonic B-meson decay B → K * µμ has been explored in the framework of the gauged U(1) µ−τ symmetry. Apart from the muon anomalous magnetic moment and neutrino sector, we formulate the model starting with a valid Lagrangian and consider the constraints from the neutral meson mixings, the bounds on direct detection and the relic density of the bosonic dark matter candidate augmented to collider constraints. We search the parameter space, which accommodate the size of the anomaly of the B → K * µμ decay, to satisfy all experimental constraints. We found the allowed region on the plane of the dark matter and Z ′ masses is rather narrow compared to the previous analysis. * Electronic address: parada.hutauruk@apctp.org † Electronic address: nomura@kias.re.kr ‡ Electronic address: hiroshi.okada@apctp.org § Electronic address: Yuta.Orikasa@utef.cvut.cz 1 Recently, a stringent constraint of the neutrino-trident process gives narrower parameter spaces of the extra gauge coupling (g ′ ) and mass (m Z ′ ).

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“…[16] we introduced a fermion dark matter (DM) model whose stability is originated from U (1) Lµ−Lτ symmetry [17]. The model can also explain b → sµµ anomaly by introducing SU (2) L -doublet scalar field, and we showed that there is a strong interplay between the DM and B-physics phenomenology [18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33]. In this paper we consider a "spin-flipped" version of the model in Ref.…”

Section: Introductionmentioning

confidence: 99%

Scalar dark matter behind b → sμμ anomaly

Baek

2019

J. High Energ. Phys.

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We construct a scalar dark matter model with U (1) Lµ−Lτ symmetry in which the dark matter interacts with the quark flavours, allowing lepton non-universal b → s ¯ decays. The model can solve b → sµµ (R K ( * ) ) anomaly and accommodate the relic abundance of dark matter simultaneously while satisfying the constraints from other low energy flavour experiments and direct detection experiments of dark matter. The new fields include vector-like heavy quarks U and D, U (1) Lµ−Lτ breaking scalar S, as well as the dark matter candidate X I and its heavy partner X R . To explain both b → sµµ anomaly and the dark matter, i) large mass difference between X R and X I is required, ii) electroweak scale dark matter and heavy quarks are favoured, iii) not only electroweak scale but O(10) TeV dark gauge boson Z and X R are allowed.

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Explaining B→K(*)ℓ+ℓ−

Cited by 61 publications

References 39 publications

Flavoured gauge extension of singlet-doublet fermionic dark matter: neutrino mass, high scale validity and collider signatures

Flavoured gauge extension of singlet-doublet fermionic dark matter: neutrino mass, high scale validity and collider signatures

Dark matter and B -meson anomalies in a flavor dependent gauge symmetry

Scalar dark matter behind b → sμμ anomaly

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