Flavor-changing light bosons with accidental longevity

Abstract

We consider a model with a complex scalar field that couples to $(e,\mu )$ or $(\mu ,\tau )$ within the "longevity" window: $[|m_{l_1}-m_{l_2}|,m_{l_1}+m_{l_2}]$ in which $l_1$ and $l_2$ are the two different charged leptons. Within such a mass window, even a relatively large coupling (e.g. of the size commensurate with the current accuracy/discrepancy in the muon $g-2$ experiment) leads to long lifetimes and macroscopic propagation distance between production and decay points. We propose to exploit several existing neutrino experiments and one future experiment to probe the parameter space of this model. For the $\mu -e$ sector, we exploit the muonium decay branching ratio and the production and decay sequence at the LSND experiment, excluding the parametric region suggested by $g_{\mu }-2$ anomaly. For the $\tau -\mu$ sector, we analyze three main production mechanisms of scalars at beam dump experiments: the Drell-Yan process, the heavy meson decay, and the muon scattering. We explore the constraints from the past CHARM and NuTeV experiments, and evaluate sensitivity for the proposed beam dump experiment, SHiP. The latter can thoroughly probe the parameter space relevant for the $g_{\mu }-2$ anomaly.

arXiv comment30 pages, 9 figures and comments welcome

References in corpus (49)

• An Introduction to PYTHIA 8.2
• MadGraph 5 : Going Beyond
• The BABAR Detector
• The anomalous magnetic moment of the muon in the Standard Model
• New Measurement of the Electron Magnetic Moment and the Fine Structure Constant
• Measurement of the fine-structure constant as a test of the Standard Model
• Leading hadronic contribution to the muon magnetic moment from lattice QCD
• A facility to Search for Hidden Particles at the CERN SPS: the SHiP physics case
• New Fixed-Target Experiments to Search for Dark Gauge Forces
• Reevaluation of the hadronic vacuum polarisation contributions to the Standard Model predictions of the muon g-2 and alpha(mZ) using newest hadronic cross-section data
• The $g-2$ of charged leptons, $\alpha (M_Z^2)$ and the hyperfine splitting of muonium
• Two-pion contribution to hadronic vacuum polarization
• Three-pion contribution to hadronic vacuum polarization
• TikZ-Feynman: Feynman diagrams with TikZ
• Flaxion: a minimal extension to solve puzzles in the standard model
• Flavor probes of axion-like particles
• The Axiflavon
• Window observable for the hadronic vacuum polarization contribution to the muon $g-2$ from lattice QCD
• Quark Flavor Phenomenology of the QCD Axion
• Axion-like particles, lepton-flavor violation and a new explanation of $a_{\mu }$ and $a_e$
• Lepton Flavor Violation in the Standard Model with general Dimension-Six Operators
• Higgs-Mediated tau -> 3 mu in the Supersymmetric Seesaw Model
• Hunting for ALPs with Lepton Flavor Violation
• Bounds on the Coupling of the Majoron to Light Neutrinos from Supernova Cooling
• Looking forward to Lepton-flavor-violating ALPs
• Supernova Bounds on Majoron-emitting decays of light neutrinos
• Constraints on SUSY Lepton Flavour Violation by rare processes
• Neutrino masses, muon g-2, and lepton-flavour violation in the supersymmetric see-saw model
• Revising Limits on Neutrino-Majoron Couplings
• Lepton-flavor-violating Higgs decay $h\to \mu \tau$ and muon anomalous magnetic moment in a general two Higgs doublet model
• $b\to s{\ell }^{+}{\ell }^{-}$ Transitions in Two-Higgs-Doublet Models
• Lepton flavour violating Higgs and tau to mu gamma
• Heavy Quark Physics on the Lattice
• Search for the lepton flavor violating decay A^0/H^0 --> tau^{+/-} mu^{+/-} at hadron colliders
• Probing $e\mu$ flavor-violating ALP at Belle II
• Testing the 2HDM explanation of the muon g-2 anomaly at the LHC
• Lepton flavour violation in the MSSM
• Probing $\mu \tau$ flavor-violating solutions for the muon $g-2$ anomaly at Belle II
• Muon anomalous magnetic moment in the standard model with two Higgs doublets
• The Anomalous Magnetic Moment of the Muon and Higgs-Mediated Flavor Changing Neutral Currents
• Lepton-specific inert two-Higgs-doublet model confronted with the new results for muon and electron g-2 anomalies and multi-lepton searches at the LHC
• Pair production of dark particles in meson decays
• Flavoured Warped Axion
• Searching for Flavor-Violating ALPs in Higgs Decays
• A $\mu$-$\tau$-philic scalar doublet under $Z_n$ flavor symmetry
• Invisible decay of muonium: Tests of the standard model and searches for new physics
• muon $g-2$ anomaly and $\mu$-$\tau$-philic Higgs doublet with a light CP-even component
• A $\mu$-$\tau$-philic Higgs doublet confronted with the muon g-2, $\tau$ decays and LHC data
• Reevaluation of heavy-fermion-induced electron EDM at three loops

Cited by in corpus (4)

• Lepton-Flavor-Violating ALP Signals with TeV-Scale Muon Beams
• Sensitivity potential to a light flavor-changing scalar boson with DUNE and NA64$\mu$
• The Muon Magnetic Moment and Physics Beyond the Standard Model
• Neutron stars can shine a light on elusive lepton-flavor-violating dark matter