Gauge Theory for Baryon and Lepton Numbers with Leptoquarks

Duerr, Michael; Pérez, P.; Wise, Mark B.

doi:10.1103/physrevlett.110.231801

Cited by 130 publications

(180 citation statements)

References 19 publications

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“…Among the simplest SM extensions which can give neutrinos a mass and predict new resonances at the LHC reach, the see-saw of type II provides the cleanest signal: in this case the mediator is a heavy scalar triplet of hypercharge 1, (∆ ++ , ∆ + , ∆ 0 ), which can resonate in the same-sign dilepton channel, ∆ ++ → l ± l ± . The production rate is of EW size, which is the largest possible because a priori this NP has no color, and 25 Independently of whether it is gauged [115,116] or not.…”

Section: Discussionmentioning

confidence: 99%

LHC bounds on lepton number violation mediated by doubly and singly-charged scalars

Águila

Chala

2014

J. High Energ. Phys.

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Abstract:The only possible doubly-charged scalar decays into two Standard Model particles are into pairs of same-sign charged leptons, H ±± → l ± l ± , l = e, µ, τ , or gauge bosons, H ±± → W ± W ± ; being necessary the observation of both to assert the violation of lepton number. However, present ATLAS and CMS limits on doubly-charged scalar production are obtained under specific assumptions on its branching fractions into dileptons only. Although they can be extended to include decays into dibosons and lepton number violating processes. Moreover, the production rates also depend on the type of electroweak multiplet H ±± belongs to. We classify the possible alternatives and provide the Feynman rules and codes for generating the corresponding signals for pair and associated doubly-charged scalar production, including the leading contribution from the s-channel exchange of electroweak gauge bosons as well as the vector-boson fusion corrections. Then, using the same analysis criteria as the LHC collaborations we estimate the limits on the H ±± mass as a function of the electroweak multiplet it belongs to, and obtain the bounds on the lepton number violating processes pp → H ±± H ∓∓ → ± ± W ∓ W ∓ and pp → H ±± H ∓ → ± ± W ∓ Z, = e, µ, implied by the ATLAS and CMS doubly-charged scalar searches.

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Section: Discussionmentioning

confidence: 99%

LHC bounds on lepton number violation mediated by doubly and singly-charged scalars

Águila

Chala

2014

J. High Energ. Phys.

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“…Examples of anomalons are given in refs. [28,[30][31][32]. We assume that these do not have an impact on the Z phenomenology.…”

Section: Dark Matter and A Light Z Bosonmentioning

confidence: 99%

Dark matter beams at LBNF

Coloma

Dobrescu

Frugiuele

et al. 2016

J. High Energ. Phys.

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High-intensity neutrino beam facilities may produce a beam of light dark matter when protons strike the target. Searches for such a dark matter beam using its scattering in a nearby detector must overcome the large neutrino background. We characterize the spatial and energy distributions of the dark matter and neutrino beams, focusing on their differences to enhance the sensitivity to dark matter. We find that a dark matter beam produced by a Z boson in the GeV mass range is both broader and more energetic than the neutrino beam. The reach for dark matter is maximized for a detector sensitive to hard neutral-current scatterings, placed at a sizable angle off the neutrino beam axis. In the case of the Long-Baseline Neutrino Facility (LBNF), a detector placed at roughly 6 degrees off axis and at a distance of about 200 m from the target would be sensitive to Z couplings as low as 0.05. This search can proceed symbiotically with neutrino measurements. We also show that the MiniBooNE and MicroBooNE detectors, which are on Fermilab's Booster beamline, happen to be at an optimal angle from the NuMI beam and could perform searches with existing data. This illustrates potential synergies between LBNF and the short-baseline neutrino program if the detectors are positioned appropriately.

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“…The new leptons will also receive mass contributions from electroweak symmetry breaking through the y ν,e , y ν,e couplings. Note also that unless L , L = 0 , explicit Majorana masses for ν R and ν L are not allowed nor will they be generated after lepton number breaking unless L = −L = −3/2 (This case was considered explicitly in the context of gauged lepton and baryon number with vector-like 'lepto-quarks' [10]). We avoid these choices in what follows.…”

Section: Yukawa Sectormentioning

confidence: 99%

“…For scales Λ O(100) TeV the model considered here should be reasonably safe from the effects of these potentially dangerous operators. Of course one can extend this model to include gauged baryon number as well to prevent these operators [10].…”

Section: F Possible Extensionsmentioning

confidence: 99%

“…However, the first complete and consistent model of gauged lepton number (and baryon number) was not explored until more recently in [6] with numerous variations following [7][8][9][10][11][12]. Here we explore a particular realization where the DM arises as part of the exotic lepton sector required by gauging lepton number and the attendant need to cancel anomalies.…”

Section: Introductionmentioning

confidence: 99%

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Dark matter and vectorlike leptons from gauged lepton number

2013

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We investigate a simple model where Lepton number is promoted to a local U (1)L gauge symmetry which is then spontaneously broken, leading to a viable thermal DM candidate and vector-like leptons as a byproduct. The dark matter arises as part of the exotic lepton sector required by the need to satisfy anomaly cancellation and is a Dirac electroweak (mostly) singlet neutrino. It is stabilized by an accidental global symmetry of the renormalizable Lagrangian which is preserved even after the gauged lepton number is spontaneously broken and can annihilate efficiently to give the correct thermal relic abundance. We examine the ability of this model to give a viable DM candidate and discuss both direct and indirect detection implications. We also examine some of the LHC phenomenology of the associated exotic lepton sector and in particular its effects on Higgs decays.

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Gauge Theory for Baryon and Lepton Numbers with Leptoquarks

Cited by 130 publications

References 19 publications

LHC bounds on lepton number violation mediated by doubly and singly-charged scalars

LHC bounds on lepton number violation mediated by doubly and singly-charged scalars

Dark matter beams at LBNF

Dark matter and vectorlike leptons from gauged lepton number

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