Electron beam dump constraints on light bosons with lepton flavor violating couplings

Araki, Takeshi; Asai, Kento; Shimomura, Takashi

doi:10.1007/jhep11(2021)082

Cited by 5 publications

(1 citation statement)

References 82 publications

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“…In this article we will employ the SMEFT framework to study low-energy constraints on LFVZD. This type of decays have been also studied within several UV-complete models, such as heavy sterile neutrinos [37][38][39][40][41][42][43], supersymmetry [22,44], leptoquarks [45], or in scenarios with extended gauge sectors [46][47][48][49]. They have also been previously explored in the context of SMEFT in [16,24,25,28,33].…”

Section: Introductionmentioning

confidence: 99%

Z lepton flavour violation as a probe for new physics at future $e^+e^-$ colliders

Calibbi,

Marcano,

Roy

2021

Preprint

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In this work we assess the potential of discovering new physics by searching for leptonflavour-violating (LFV) decays of the Z boson, Z → i j , at the proposed circular e + e − colliders CEPC and FCC-ee. Both projects plan to run at the Z-pole as a "Tera Z factory", i.e., collecting O 10 12 Z decays. In order to discuss the discovery potential in a modelindependent way, we revisit the LFV Z decays in the context of the Standard Model effective field theory and study the indirect constraints from LFV µ and τ decays on the operators that can induce Z → i j . We find that, while the Z → µe rates are beyond the expected sensitivities, a Tera Z factory is promising for Z → τ decays, probing New Physics at the same level of future low-energy LFV observables.

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Section: Introductionmentioning

confidence: 99%

Z lepton flavour violation as a probe for new physics at future $e^+e^-$ colliders

Calibbi,

Marcano,

Roy

2021

Preprint

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Search for lepton flavor violating decay at FASER

Araki

Asai

Otono

et al. 2023

J. High Energ. Phys.

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FASER is one of the promising experiments which search for long-lived particles beyond the Standard Model. In this paper, we consider charged lepton flavor violation (CLFV) via a light and weakly interacting boson and discuss the detectability by FASER. We focus on four types of CLFV interactions, i.e., the scalar-, pseudoscalar-, vector-, and dipole-type interaction, and calculate the sensitivity of FASER to each CLFV interaction. We show that, with the setup of FASER2, a wide region of the parameter space can be explored. Particularly, it is found that FASER2 has a sensitivity to very small coupling regions in which the rare muon decays, such as μ → eγ, cannot place bounds, and that there is a possibility to detect CLFV decays of the new light bosons.

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The Forward Physics Facility at the High-Luminosity LHC

Feng

Kling

Reno

et al. 2023

J. Phys. G: Nucl. Part. Phys.

115

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High energy collisions at the High-Luminosity Large Hadron Collider (LHC) produce a large number of particles along the beam collision axis, outside of the acceptance of existing LHC experiments. The proposed Forward Physics Facility (FPF), to be located several hundred meters from the ATLAS interaction point and shielded by concrete and rock, will host a suite of experiments to probe standard model (SM) processes and search for physics beyond the standard model (BSM). In this report, we review the status of the civil engineering plans and the experiments to explore the diverse physics signals that can be uniquely probed in the forward region. FPF experiments will be sensitive to a broad range of BSM physics through searches for new particle scattering or decay signatures and deviations from SM expectations in high statistics analyses with TeV neutrinos in this low-background environment. High statistics neutrino detection will also provide valuable data for fundamental topics in perturbative and non-perturbative QCD and in weak interactions. Experiments at the FPF will enable synergies between forward particle production at the LHC and astroparticle physics to be exploited. We report here on these physics topics, on infrastructure, detector, and simulation studies, and on future directions to realize the FPF’s physics potential.

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Electron beam dump constraints on light bosons with lepton flavor violating couplings

Cited by 5 publications

References 82 publications

Z lepton flavour violation as a probe for new physics at future $e^+e^-$ colliders

Z lepton flavour violation as a probe for new physics at future $e^+e^-$ colliders

Search for lepton flavor violating decay at FASER

The Forward Physics Facility at the High-Luminosity LHC

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