Improved upper limit on Muonium to Antimuonium Conversion

Abstract

A new experiment has been set up at the Paul Scherrer Institut to search for muonium to antimuonium conversion. No event was found to fulfil the requested signature which consists of the coincident detection of both constituents of the antiatom in its decay. Assuming an effective (V-A)$\times$(V-A) type interaction an improved upper limit is established for the conversion probability of ${\mathrm{P}}_{\mathrm{M}\bar{\mathrm{M}}}\le 8\cdot 10^{-9}$ (90%C.L.), which is almost two orders of magnitude lower compared to previous results and provides a sensitive test for theoretical extensions of the standard model.

References in corpus (4)

• Muonium Hyperfine Structure and the Decay ${\mu }^{+}\to e^{+}+{\overline{\nu }}_e+{\nu }_{\mu }$ in Models with Dilepton Gauge Bosons
• Muonium-Antimuonium Conversion in Models with Dilepton Gauge Bosons
• Magnetic Field Dependence of Muonium-antimuonium Conversion
• ${\mu }^{+}{e}^{-}<--->{\mu }^{-}{e}^{+}$ Transitions via Neutral Scalar Bosons

Cited by in corpus (18)

• Muon Decay and Physics Beyond the Standard Model
• New Bounds from Searching for Muonium to Antimuonium Conversion
• Recent Progress in Neutrino Factory and Muon Collider Research within the Muon Collaboration
• Lepton Flavor Violation without Supersymmetry
• Impact of sterile neutrinos on nuclear-assisted cLFV processes
• Constraints from Precision Electroweak Data on Leptoquarks and Bileptons
• Lower Bounds on Bilepton Processes at e-e- and mu-mu- Colliders
• Muonium-antimuonium conversion in models with heavy neutrinos
• Science Case for the new High-Intensity Muon Beams HIMB at PSI
• Bileptons - Status and Prospects
• Conceptual Design of the Muonium-to-Antimuonium Conversion Experiment (MACE)
• The Muonium Atom as a Probe of Physics beyond the Standard Model
• Lepton flavor violation in muonium decay and muon colliders in models with heavy neutrinos
• Gauge Invariance of the Muonium-Antimuonium Oscillation Time Scale and Limits on Right-Handed Neutrino Masses
• Bileptons from Muon Collider Backward Scattering
• Muonium-Antimuonium Oscillations in an extended Minimal Supersymmetric Standard Model with right-handed neutrinos
• Hyperfine structure and $(e^{-},e^{+})$-pair annihilation in the muonium-positronium MuPs and positronium hydrides
• Automated event generation for S-wave quarkonium and leptonium production in NRQCD and NRQED