Searching for new physics at $\mu \to e$ facilities with ${\mu }^{+}$ and ${\pi }^{+}$ decays at rest

Abstract

We investigate the ability of $\mu \to e$ facilities, Mu2e and COMET, to probe, or discover, new physics with their detector validation datasets. The validation of the detector response may be performed using a dedicated run with ${\mu }^{+}$, collecting data below the Michel edge, $E_e\lesssim 52$ MeV; an alternative strategy using ${\pi }^{+}\to e^{+}{\nu }_e$ may also be considered. We focus primarily on a search for a monoenergetic $e^{+}$ produced via two-body decays ${\mu }^{+}\to e^{+}X$ or ${\pi }^{+}\to e^{+}X$, with $X$ a light new physics particle. Mu2e can potentially explore new parameter space beyond present astrophysical and laboratory constraints for a set of well motivated models including: axion like particles with flavor violating couplings (${\mu }^{+}\to e^{+}a$), massive $Z^{\prime }$ bosons (${\mu }^{+}\to Z^{\prime }{e}^{+}$), and heavy neutral leptons (${\pi }^{+}\to e^{+}N$). The projected sensitivities presented herein can be achieved in a matter of days.

arXiv commentSame as v2, journal added. (from v2:) New projections for COMET, updated references and figures. Typos fixed

References in corpus (111)

• Muon Decay and Physics Beyond the Standard Model
• The landscape of QCD axion models
• A Search for Invisible Axion Dark Matter with the Axion Dark Matter Experiment
• New Limit for the Family-Number Non-conserving Decay mu+ to e+_gamma
• Light Dark Matter Search with Ionization Signals in XENON1T
• Physics Beyond Colliders at CERN: Beyond the Standard Model Working Group Report
• Extended Search for the Invisible Axion with the Axion Dark Matter Experiment
• Right-Handed Neutrinos at LHC and the Mechanism of Neutrino Mass Generation
• Exploring Portals to a Hidden Sector Through Fixed Targets
• Dielectric Haloscopes: A New Way to Detect Axion Dark Matter
• Detailed calculation of lepton flavor violating muon-electron conversion rate for various nuclei
• Flavour physics of leptons and dipole moments
• Low energy effects of neutrino masses
• The Phenomenology of Right Handed Neutrinos
• The ORGAN Experiment: An axion haloscope above 15 GHz
• How to find neutral leptons of the nuMSM?
• Minimal Flavour Seesaw Models
• New Bounds from Searching for Muonium to Antimuonium Conversion
• TeV Scale See-Saw Mechanisms of Neutrino Mass Generation, the Majorana Nature of the Heavy Singlet Neutrinos and $\betabeta$-Decay
• Flaxion: a minimal extension to solve puzzles in the standard model
• Phenomenology of GeV-scale Heavy Neutral Leptons
• Flavor probes of axion-like particles
• The Axiflavon
• Muon conversion to electron in nuclei in type-I seesaw models
• Charged Lepton Flavor Violation: An Experimenter's Guide
• Lepton Flavor and Number Conservation, and Physics Beyond the Standard Model
• Axion and hidden photon dark matter detection with multilayer optical haloscopes
• Quark Flavor Phenomenology of the QCD Axion
• Neutrinoless double beta decay versus other probes of heavy sterile neutrinos
• Dark Neutrino Portal to Explain MiniBooNE excess
• COMET Phase-I Technical Design Report
• Dipole portal to heavy neutral leptons
• Model for a Light Z' Boson
• Axion-like particles, lepton-flavor violation and a new explanation of $a_{\mu }$ and $a_e$
• Lepton flavor violating Z' explanation of the muon anomalous magnetic moment
• Piezoelectrically Tuned Multimode Cavity Search for Axion Dark Matter
• Hunting for ALPs with Lepton Flavor Violation
• Fundamental Physics at the Intensity Frontier
• Searching for galactic axions through magnetized media: the QUAX proposal
• Global Constraints on a Heavy Neutrino
• The mu - e Conversion in Nuclei, mu --> e gamma, mu --> 3e Decays and TeV Scale See-Saw Scenarios of Neutrino Mass Generation
• The Search for Feebly-Interacting Particles
• Topological Susceptibility and QCD Axion Mass: QED and NNLO corrections
• Neutrino Portals to Dark Matter
• Limits on Axion Couplings from the first 80-day data of PandaX-II Experiment
• Search for Lepton Flavor Violation in the Decay tau -> electron gamma
• Constraints on Sterile Neutrinos in the MeV to GeV Mass Range
• Phenomenology of $U(1{)}_{L_{\mu }-L_{\tau }}$ charged dark matter at PAMELA/FERMI and colliders
• Improved measurement of the $π\rightarrow \mbox{e} ν$ branching ratio
• Lepton flavor violation in the Higgs sector and the role of hadronic tau-lepton decays
• Improved Search for Heavy Neutrinos in the Decay $\pi \to e\nu$
• Lepton flavour violating semileptonic tau decays in constrained MSSM-seesaw scenarios
• A search for two body muon decay signals
• Heavy Neutral Leptons from low-scale seesaws at the DUNE Near Detector
• Future Directions in the Microwave Cavity Search for Dark Matter Axions
• Thermal Dark Matter Through the Dirac Neutrino Portal
• Tau Decays to Mu + Eta in Supersymmetric Models
• Higgs Decays in the Low Scale Type I See-Saw Model
• Lepton flavor violation with light vector bosons
• The Mu2e Experiment
• Anomaly free Froggatt-Nielsen models of flavor
• Flavourful Axion Phenomenology
• The electron energy spectrum in muon decay through O(alpha^2)
• Muon decay in orbit: spectrum of high-energy electrons
• Charged Lepton Flavor Violation at the EIC
• Search for the light dark matter with an X-ray spectrometer
• Search for Lepton Flavor Violating tau Decays into Three Leptons
• The model-discriminating power of lepton flavor violating tau decays
• Minimal Flavor Violation with Axion-like Particles
• Low-scale standard supersymmetric leptogenesis
• Detecting Light Boson Dark Matter through Conversion into Magnon
• The Majoron at two loops
• The Dark $L_{\mu }-L_{\tau }$ Rises via Kinetic Mixing
• Astrophysical and Terrestrial Constraints on Singlet Majoron Models
• Improved Constraints on Sterile Neutrinos in the MeV to GeV Mass Range
• Search for Lepton Flavor Violating Decays ${\tau }^{\pm }\to {\ell }^{\pm }{\pi }^0,{\ell }^{\pm }\eta ,{\ell }^{\pm }{\eta }^{\prime }$
• The Minimal Flavour Violating Axion
• A Realistic U(2) Model of Flavor
• O(α^2 \ln(m_μ/m_e)) Corrections to Electron Energy Spectrum in Muon Decay
• Lepton-flavor violating axions at MEG II
• Lepton Flavor Violation with Displaced Vertices
• New constraints on Heavy Neutral Leptons from Super-Kamiokande data
• Muon Decay Spectrum: Leading Logarithmic Approximation
• MUonE sensitivity to new physics explanations of the muon anomalous magnetic moment
• Coherent muon-electron conversion in muonic atoms
• Searching for Decaying and Annihilating Dark Matter with Line Intensity Mapping
• $U(1)$ flavour symmetries as Peccei-Quinn symmetries
• Flavor Violating Axions in the Early Universe
• Electron-to-Tau Lepton Flavor Violation at the Electron-Ion Collider
• Muonium-antimuonium oscillations in effective field theory
• Lepton flavour violation from an anomaly-free leptophilic axion-like particle
• Higher order QED corrections to muon decay spectrum
• Dark Matter in Anomaly-Free Gauge Extensions
• The Effective Lagrangian for the Seesaw Model of Neutrino Mass and Leptogenesis
• On the IR/UV flavour connection in non-universal axion models
• Ultralight scalars in leptonic observables
• Michel decay spectrum for a muon bound to a nucleus
• Neutrino Portals, Terrestrial Upscattering, and Atmospheric Neutrinos
• Chiral Froggatt-Nielsen models, gauge anomalies and flavourful axions
• Search for Lepton-Flavor-Violating $\tau$ Decays to a Lepton and an Invisible Boson at Belle II
• Haloscope searches for dark matter axions at the Center for Axion and Precision Physics Research
• Search for Majoron at the COMET Experiment
• Bounds on majoron emission from muon to electron conversion experiments
• Improved search for two body muon decay ${\mu }^{+}\to e^{+}{X}_H$
• Higgs mediated CLFV processes $\mu N(eN)\to \tau X$ via gluon operators
• Flavor violating muon decay into an electron and a light gauge boson
• High-precision muon decay predictions for ALP searches
• Flavor from the double tetrahedral group without supersymmetry: flavorful axions and neutrinos
• Radiative (anti)neutrino energy spectra from muon, pion, and kaon decays
• Model identification in ${\mu }^{-}\to e^{-}$ conversion with invisible boson emission using muonic atoms
• Gauging lepton flavor SU(3) for the muon $g-2$

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• Effective theory tower for $\mu \to e$ conversion
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• Revisiting for maximal flavor violating $Z_{e\mu }^{{}^{\prime }}$ and its phenomenology constraints
• Direct Detection of Ultralight Dark Matter via Charged Lepton Flavor Violation
• Loop-Level Lepton Flavor Violation and Diphoton Signals in the Minimal Left-Right Symmetric Model