Flavor-changing neutral currents in 331 models

Cabarcas, J. M.; Dumm, D. Gómez; Martı́nez, R.

doi:10.1088/0954-3899/37/4/045001

Cited by 28 publications

(13 citation statements)

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“…In the latter setup the Z would be the mediator and therefore our bounds would apply up to some extent, because the couplings of the Z boson on those models are not so different from the model we investigate here. Moreover, these limits are complementary to other limits coming from colliders [37], Flavor Changing Neutral Current processes [38][39][40][41][42][43][44][45][46], electroweak corrections to the S,T,U parameters [47][48][49][50][51], and from muon decay [52,53]. More importantly, the limits on the mass of the Z found here imply a bound on the scale of symmetry breaking that forces all particle masses to lie at a few TeV, if one considers all couplings to be of order 1.…”

Section: Direct Detection and Bounds On The Zmentioning

confidence: 99%

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Constraining the $$Z^{\prime }$$ Z ′ mass in 331 models using direct dark matter detection

Profumo

Queiroz

2014

Eur. Phys. J. C

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We investigate a so-called 331 extension of the Standard Model gauge sector which accommodates neutrino masses and where the lightest of the new neutral fermions in the theory is a viable particle dark matter candidate. In this model, processes mediated by the additional Z gauge boson set both the dark matter relic abundance and the scattering cross section off of nuclei. We calculate with unprecedented accuracy the dark matter relic density, including the important effect of coannihilation across the heavy fermion sector, and show that indeed the candidate particle has the potential of having the observed dark matter density. We find that the recent LUX results put very stringent bounds on the mass of the extra gauge boson, M Z 2 TeV, independently of the dark matter mass. We also comment on the regime where our bounds on the Z mass may apply to generic 331-like models, and on implications for LHC phenomenology.

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Section: Direct Detection and Bounds On The Zmentioning

confidence: 99%

“…[37] do apply to our model. A variety limits have been placed on the mass of this boson and they come from different sources [38][39][40][41][42][43][44][45][46][47][48][49][50][51][52][53] and from different models. In summary, the bounds derived here on the mass of this boson are complementary to those.…”

Section: • Fermionsmentioning

confidence: 99%

Constraining the $$Z^{\prime }$$ Z ′ mass in 331 models using direct dark matter detection

Profumo

Queiroz

2014

Eur. Phys. J. C

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“…In the universe of the 3-3-1 model, bounds on M Z 0 were obtained from different analyses such as the contribution from exotics to the oblique electroweak correction parameters (S, T and U) [12][13][14], corrections to the Z-pole observables for arbitrary values of [15][16][17], the study of the energy region where perturbative treatment is still valid [18], Z 0 and exotic boson masses contribution to the muon decay parameters [19,20], the decay ! 3e [21], and the contribution from neutral bosons to the flavor changing neutral current [22][23][24][25][26][27][28][29][30][31][32].…”

Section: Introductionmentioning

confidence: 99%

Bounds onZ′from 3-3-1 model at the LHC energies

2013

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The Large Hadron Collider will restart with higher energy and luminosity in 2015. This achievement opens the possibility of discovering new phenomena hardly described by the Standard Model, which is based on the following two neutral gauge bosons: the photon and the Z. This perspective imposes a deep and systematic study of models that predicts the existence of new neutral gauge bosons. One such model is based on the gauge group SUð3Þ C Â SUð3Þ L Â Uð1Þ N , called the 3-3-1 model for short. In this paper we perform a study with Z 0 predicted in two versions of the 3-3-1 model and compare the signature of this resonance in each model version. By considering the present and future LHC energy regimes, we obtain some distributions and the total cross section for the process p þ p ! ' þ þ ' À þ X. Additionally, we derive lower bounds on Z 0 mass from the latest LHC results. Finally we analyze the LHC potential for discovering this neutral gauge boson at 14 TeV center-of-mass energy.

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“…The overline distinguishes β from the parameter β characterizing the 331 models. 3 The mass difference in the neutral D system has been studied in 331 models with β = ±1/ √ 3 considering the contribution to FCNC of the mixing between ordinary and exotic quarks [14]. The effects of new scalars have been investigated in [15], while FCNC processes in 331 models with right-handed neutrinos have been considered in [16].…”

Section: 10)mentioning

confidence: 99%

The charm of 331

Buras

Colangelo

Fazio

et al. 2021

J. High Energ. Phys.

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We perform a detailed analysis of flavour changing neutral current processes in the charm sector in the context of 331 models. As pointed out recently, in the case of Z′ contributions in these models there are no new free parameters beyond those already present in the Bd,s and K meson systems analyzed in the past. As a result, definite ranges for new Physics (NP) effects in various charm observables could be obtained. While generally NP effects turn out to be small, in a number of observables they are much larger than the tiny effects predicted within the Standard Model. In particular we find that the branching ratio of the mode D0→ μ+μ−, despite remaining tiny, can be enhanced by 6 orders of magnitude with respect to the SM. We work out correlations between this mode and rare Bd,s and K decays. We also discuss neutral charm meson oscillations and CP violation in the charm system. In particular, we point out that 331 models provide new weak phases that are a necessary condition to have non-vanishing CP asymmetries. In the case of ∆ACP, the difference between the CP asymmetries in D0→ K+K− and D0→ π+π−, we find that agreement with experiment can be obtained provided that two conditions are verified: the phases in the ranges predicted in 331 models and large hadronic matrix elements.

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Flavor-changing neutral currents in 331 models

Cited by 28 publications

References 50 publications

Constraining the $$Z^{\prime }$$ Z ′ mass in 331 models using direct dark matter detection

Constraining the $$Z^{\prime }$$ Z ′ mass in 331 models using direct dark matter detection

Bounds onZ′from 3-3-1 model at the LHC energies

The charm of 331

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