3-3-1 exotic quark search at CERN LEPII and LHC

Coutinho, Y. Amaral; Filho, P. P. Queiroz; Tonasse, M. D.

doi:10.1103/physrevd.60.115001

Cited by 20 publications

(12 citation statements)

References 22 publications

(32 reference statements)

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“…A similar logic applies to the heavy up-quark U . These quarks have masses proportional to the scale of symmetry breaking of the 3-3-1 symmetry which should lie at several TeV to be consistent with the non-observation of such exotic quarks [53,54]. The scale of symmetry breaking of the 3-3-1 symmetry will be kept sufficiently high to be consistent with this result.…”

Section: Fermion Contentsupporting

confidence: 65%

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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Section: Fermion Contentsupporting

confidence: 65%

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

et al. 2019

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“…The muonium fine structure only implies m U =g > 215 GeV assuming only the vector bilepton contributions [50]. Concerning the exotic quark masses, there is no lower limit for their masses but if they are in the range of 200-600 GeV they may be discovered at the LHC [51]. A search for free stable color triplets quarks has been carried out in a p p collider at an energy of 1.8 GeV, excluding these particles in the range 50 -139 GeV, 50 -116 GeV, and 50 -140 GeV for the electric charges of 1, 2=3, and 4=3, respectively [52].…”

Section: Conclusion and Discussionmentioning

confidence: 99%

SoftCPviolation inK-meson systems

et al. 2006

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We consider a model with soft CP violation which accommodates the CP violation in the neutral kaons even if we assume that the Cabibbo-Kobayashi-Maskawa mixing matrix is real and the sources of CP violation are three complex vacuum expectation values and a trilinear coupling in the scalar potential. We show that for some reasonable values of the masses and other parameters the model allows us to explain all the observed CP violation processes in the K 0 -K 0 system.

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“…The fine structure of muonium only implies M U =g > 215 GeV [38] but also ignores the contributions of the doubly charged scalars. Concerning the exotic quark masses there is no lower limit for them but if they are in the range of 200 -600 GeV they may be discovered at the LHC [39]. Similarly, most of the searches for extra neutral gauge bosons are based on models that do not have the same neutral current couplings as those of the 3-3-1 models [2].…”

Section: Conclusion and Discussionmentioning

confidence: 99%

Closing theSU(3)L⊗U(1)Xsymmetry at the electroweak scale

2006

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We show that some models with SU3 C SU3 L U1 X gauge symmetry can be realized at the electroweak scale and that this is a consequence of an approximate global SU2 LR symmetry. This symmetry implies a condition among the vacuum expectation value of one of the neutral Higgs scalars, the U1 X 's coupling constant, g X , the sine of the weak mixing angle sin W , and the mass of the W boson, M W . In the limit in which this symmetry is valid it avoids the tree level mixing of the Z boson of the standard model with the extra Z 0 boson. We have verified that the oblique T parameter is within the allowed range indicating that the radiative corrections that induce such a mixing at the 1-loop level are small. We also show that a SU3 LR custodial symmetry implies that in some of the models we have to include sterile (singlets of the 3-3-1 symmetry) right-handed neutrinos with Majorana masses, since the seesaw mechanism is mandatory to obtain light active neutrinos. Moreover, the approximate SU2 LR SU3 LR symmetry implies that the extra nonstandard particles of these 3-3-1 models can be considerably lighter than it had been thought before so that new physics can be really just around the corner.

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3-3-1 exotic quark search at CERN LEPII and LHC

Cited by 20 publications

References 22 publications

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

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

SoftCPviolation inK-meson systems

Closing theSU(3)L⊗U(1)Xsymmetry at the electroweak scale

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