Light vectors coupled to bosonic currents

Dror, Jeff A.; Lasenby, Robert; Pospelov, Maxim

doi:10.1103/physrevd.99.055016

Cited by 30 publications

(38 citation statements)

References 84 publications

(116 reference statements)

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“…Taken together with the constraints from Fig. 5 we see that the largest NSI in this model can be achieved with a Z with mass either in the very narrow region around 5 GeV (slightly above the B → KZ threshold [103] and below the Z → 4µ sensitivity ( Fig. 5), although the latter can most likely be pushed down to close this gap) or above ∼ 60 GeV (above rare-decay thresholds), giving NSI as large as a few percent (Eq.…”

Section: Nsi With Z-z Mixingsupporting

confidence: 77%

“…1. However, for such an electroweak-scale Z above ∼ 60 GeV one does not just have rare-decay constraints [103] but also direct searches at colliders, e.g. in dilepton channels.…”

Section: Nsi With Z-z Mixingmentioning

confidence: 99%

“…The Z coupling to the non-conserved neutral current ξ j NC on the other hand gives potentially strong constraints. The most generally applicable bounds are due to additional parity violation and lead to M Z /ξ 1 TeV with little dependence on the details of the UV-completion of the mass-mixing [101][102][103]. In addition, processes that are sensitive to the emission of the longitudinal Z are naively expected to receive a 1/M Z enhanced amplitude and, therefore, meson decays such as K → πZ and B → KZ promise strong constraints.…”

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confidence: 99%

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Non-Standard neutrino interactions and neutral gauge bosons

et al. 2019

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We investigate Non-Standard Neutrino Interactions (NSI) arising from a flavorsensitive Z boson of a new U (1) symmetry. We compare the limits from neutrino oscillations, coherent elastic neutrino-nucleus scattering, and Z searches at different beam and collider experiments for a variety of straightforward anomaly-free U (1) models generated by linear combinations of B − L and lepton-family-number differences L α − L β . Depending on the flavor structure of those models it is easily possible to avoid NSI signals in long-baseline neutrino oscillation experiments or change the relative importance of the various experimental searches. We also point out that kinetic Z-Z mixing gives vanishing NSI in long-baseline experiments if a direct coupling between the U (1) gauge boson and matter is absent. In contrast, Z-Z mass mixing generates such NSI, which in turn means that there is a Higgs multiplet charged under both the Standard Model and the new U (1) symmetry.

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Section: Nsi With Z-z Mixingsupporting

confidence: 77%

“…1. However, for such an electroweak-scale Z above ∼ 60 GeV one does not just have rare-decay constraints [103] but also direct searches at colliders, e.g. in dilepton channels.…”

Section: Nsi With Z-z Mixingmentioning

confidence: 99%

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confidence: 99%

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Non-Standard neutrino interactions and neutral gauge bosons

et al. 2019

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“…These preliminary results provide solid motivation for a more detailed analysis of this physics, which we leave as an interesting direction for future work. 16 Reference [67] exploited the emission of the longitudinal mode of X µ , which can lead to ∼ (m EW /m X ) 2 enhancement. However, our vector mesonV is a composite particle, which "dissolves" into its constituents at energies not far above its mass, so such enhancement does not apply.…”

Section: Vector Meson As Dark Photonmentioning

confidence: 99%

Light hidden mesons through the Z portal

Cheng

Salvioni

et al. 2019

J. High Energ. Phys.

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Confining hidden sectors are an attractive possibility for physics beyond the Standard Model (SM). They are especially motivated by neutral naturalness theories, which reconcile the lightness of the Higgs with the strong constraints on colored top partners. We study hidden QCD with one light quark flavor, coupled to the SM via effective operators suppressed by the mass M of new electroweak-charged particles. This effective field theory is inspired by a new tripled top model of supersymmetric neutral naturalness. The hidden sector is accessed primarily via the Z and Higgs portals, which also mediate the decays of the hidden mesons back to SM particles. We find that exotic Z decays at the LHC and future Z factories provide the strongest sensitivity to this scenario, and we outline a wide array of searches. For a larger hidden confinement scale Λ ∼ O(10) GeV, the exotic Z decays dominantly produce final states with two hidden mesons. ATLAS and CMS can probe their prompt decays up to M ∼ 3 TeV at the high luminosity phase, while a TeraZ factory would extend the reach up to M ∼ 20 TeV through a combination of searches for prompt and displaced signals. For smaller Λ ∼ O(1) GeV, the Z decays to the hidden sector produce jets of hidden mesons, which are long-lived. LHCb will be a powerful probe of these emerging jets.Furthermore, the light hidden vector meson could be detected by proposed dark photon searches.

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“…Alternatively, if there exists a mass mixing between the Standard Model Z boson and the new vector, L ⊃ ε Z m 2 Z X μ Z μ , it can induce a long-range force that would have been observed in neutrino oscillations unless ε Z g 0 ≲ 10 −52 [42]. However, since a mass mixing can only arise after gauge symmetry breaking, it is naturally small and is highly constrained experimentally [56].…”

Section: Introductionmentioning

confidence: 99%

Probing muonic forces with neutron star binaries

2020

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We show that gravitational wave emission from neutron star binaries can be used to discover any generic long-ranged muonic force due to the large inevitable abundance of muons inside neutron stars. As a minimal consistent example, we focus on a gauged Uð1Þ L μ −L τ symmetry. In pulsar binaries, such Uð1Þ L μ −L τ vectors induce an anomalously fast decay of the orbital period through the emission of dipole radiation. We study a range of different pulsar binaries, finding the most powerful constraints for vector masses below Oð10 −18 eVÞ. For merging binaries, the presence of muons in neutron stars can result in dipole radiation as well as a modification of the chirp mass during the inspiral phase. We make projections for a prospective search using both the GW170817 and S190814bv events and find that current data can discover light vectors with masses below Oð10 −10 eVÞ. In both cases, the limits attainable with neutron stars reach gauge coupling g 0 ≲ 10 −20 , which are many orders of magnitude stronger than previous constraints. We also show projections for next generation experiments, such as Einstein Telescope and Cosmic Explorer.

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Light vectors coupled to bosonic currents

Cited by 30 publications

References 84 publications

Non-Standard neutrino interactions and neutral gauge bosons

Non-Standard neutrino interactions and neutral gauge bosons

Light hidden mesons through the Z portal

Probing muonic forces with neutron star binaries

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