Vector leptoquarks could be rather light?

Кузнецов, А. В.; Михеев, Н. В.

doi:10.1016/0370-2693(94)90775-7

Cited by 37 publications

(17 citation statements)

References 19 publications

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“…The lower limit on the mass of this leptoquark has been discussed in Refs. [91,7,92]. An explicit model with light U 1 that is based on the SM gauge group extended with an SU (4) gauge symmetry has been presented in Ref.…”

Section: Unification Scenariosmentioning

confidence: 99%

Physics of leptoquarks in precision experiments and at particle colliders

et al. 2016

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We present a comprehensive review of physics effects generated by leptoquarks (LQs), i.e., hypothetical particles that can turn quarks into leptons and vice versa, of either scalar or vector nature. These considerations include discussion of possible completions of the Standard Model that contain LQ fields. The main focus of the review is on those LQ scenarios that are not problematic with regard to proton stability. We accordingly concentrate on the phenomenology of light leptoquarks that is relevant for precision experiments and particle colliders. Important constraints on LQ interactions with matter are derived from precision low-energy observables such as electric dipole moments, (g − 2) of charged leptons, atomic parity violation, neutral meson mixing, Kaon, B, and D meson decays, etc. We provide a general analysis of indirect constraints on the strength of LQ interactions with the quarks and leptons to make statements that are as model independent as possible. We address complementary constraints that originate from electroweak precision measurements, top, and Higgs physics. The Higgs physics analysis we present covers not only the most recent but also expected results from the Large Hadron Collider (LHC). We finally discuss direct LQ searches. Current experimental situation is summarized and self-consistency of assumptions that go into existing accelerator-based searches is discussed. A progress in making next-to-leading order predictions for both pair and single LQ productions at colliders is also outlined.

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Section: Unification Scenariosmentioning

confidence: 99%

Physics of leptoquarks in precision experiments and at particle colliders

et al. 2016

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“…Taking g 4 1, we see that the experimental lower bound on m X 2000 TeV of [34][35][36]115] requires considering DM masses m 1 3 TeV. Note that the lower bound on m X can be pushed down by an order of magnitude when fermion mixing is taken into account [38,115,116], which of course opens up our parameter space. A more precise bound is obtained by taking into account the dependence of the rate (B4) on the mass splitting ∆m = m χ3 − m χ1 > 0.…”

Section: Appendix B: Co-annihilation and Chemical Equilibriummentioning

confidence: 89%

SO(10) paths to dark matter

et al. 2019

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The grand-unification gauge group SO(10) contains matter parity as a discrete subgroup. This symmetry could be at the origin of dark matter stability. The properties of the dark matter candidates depend on the path along which SO(10) is broken, in particular through Pati-Salam or left-right symmetric subgroups. We systematically determine the non-supersymmetric dark matter scenarios that can be realized along the various paths. We emphasize that the dark matter candidates may have colored or electrically charged partners at low scale that belong to the same SO(10) multiplet. These states, which in many cases are important for co-annihilation, could be observed more easily than the dark matter particle. We determine the structure of the tree-level and loop-induced mass splittings between the dark matter candidate and their partners and discuss the possible phenomenological implications. CONTENTS

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“…The possibility of the Pati-Salam symmetry [111] at the TeV scale was discussed in Refs. [111][112][113][114][115]. Similarly to the case of U (1) Z and the left-right symmetry models anomaly cancellation only requires the addition of three right-handed neutrinos to the Standard Model states.…”

Section: Case Iv: Low Scale Pati-salam Modelsmentioning

confidence: 98%

Extra $$Z^{\prime }$$ Z ′ s and $$W^{\prime }$$ W ′ s in heterotic-string derived models

Faraggi

Guzzi

2015

Eur. Phys. J. C

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The ATLAS and CMS collaborations recently recorded possible excess in the di-boson production at the diboson invariant mass at around 2 TeV. Such an excess may be produced if there exist additional Z and/or W at that scale. We survey the extra Z s and W s that may arise from semirealistic heterotic-string vacua in the free fermionic formulation in the seven distinct cases: U (1) Z ∈ SO(10); family universal U (1) Z / ∈ SO(10); non-universal U (1) Z ; hidden sector U (1) symmetries and kinetic mixing; left-right symmetric models; Pati-Salam models; leptophobic and custodial symmetries. Each case has a distinct signature associated with the extra symmetry breaking scale. In one of the cases we explore the discovery potential at the LHC using resonant leptoproduction. The existence of an extra vector boson with the reported properties will significantly constrain the space of allowed string vacua.

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Vector leptoquarks could be rather light?

Cited by 37 publications

References 19 publications

Physics of leptoquarks in precision experiments and at particle colliders

Physics of leptoquarks in precision experiments and at particle colliders

SO(10) paths to dark matter

Extra $$Z^{\prime }$$ Z ′ s and $$W^{\prime }$$ W ′ s in heterotic-string derived models

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