23,226 research outputs found

    Horava-Lifshitz Type Quantum Field Theory and Hierarchy Problem

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    We study the Lifshitz type extension of the standard model (SM) at UV, with dynamical critical exponent z=3. One loop radiative corrections to the Higgs mass in such a model is calculated. Our result shows that, the Hierarchy problem, which has initiated many excellent extension of the minimal SM, can be weakened in the z=3 Lifshitz type quantum field theory.Comment: 8 pages, 2 figure

    Neutrino Catalyzed Diphoton Excess

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    In this paper we explain the 750 GeV diphoton resonance observed at the run-2 LHC as a scalar singlet SS, that plays a key rule in generating tiny but nonzero Majorana neutrino masses. The model contains four electroweak singlets: two leptoquarks, a singly charged scalar and a neutral scalar SS. Majorana neutrino masses might be generated at the two-loop level as SS get nonzero vacuum expectation value. SS can be produced at the LHC through the gluon fusion and decays into diphoton at the one-loop level with charged scalars running in the loop. The model fits perfectly with a wide width of the resonance. Constraints on the model are investigated, which shows a negligible mixing between the resonance and the standard model Higgs boson.Comment: 15 pages, 4 figures, minor revision, more references adde

    ATLAS Diboson Excesses from the Stealth Doublet Model

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    The ATLAS collaboration has reported excesses in diboson invariant mass searches of new resonances around 2 TeV, which might be a prediction of new physics around that mass range. We interpret these results in the context of a modified stealth doublet model where the extra Higgs doublet has a Yukawa interaction with the first generation quarks, and show that the heavy CP-even Higgs boson can naturally explain the excesses in the WW and ZZ channels with a small Yukawa coupling, \xi\sim 0.15, and a tiny mixing angle with the SM Higgs boson, \alpha \sim 0.06. Furthermore, the model satisfy constraints from colliders and electroweak precision measurements.Comment: 10 pages, 3 figure

    Phenomenology of the gauge symmetry for right-handed fermions

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    In this paper we investigate the phenomenology of the U(1) gauge symmetry for right-handed fermions, where three right-handed neutrinos are introduced for anomalies cancellation. Constraints on the new gauge boson ZRZ_{\mathbf{R}} arising from Zβˆ’Zβ€²Z-Z^\prime mixing as well as the upper bound of Zβ€²Z^\prime production cross section in di-lepton channel at the LHC are presented. We further study the neutrino mass generation and the phenomenology of ZRZ_{\mathbf{R}}-portal dark matter in this model. The lightest right-handed neutrino can be the cold dark matter candidate stabilized by a Z2Z_2 flavor symmetry. Our results show that active neutrino masses can be generated via the modified type-II seesaw mechanism; right-handed neutrino dark matter is available only for its mass at near the resonant regime of the SM Higgs and/or the new bosons; constraint from the dilepton search at the LHC is stronger than that from the Zβˆ’Zβ€²Z-Z^\prime mixing only for gR<0.121g_\mathbf{R}<0.121, where gRg_\mathbf{R} is the new gauge coupling.Comment: 17 pages, 6 figures, more references adde
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