New Bounds from Searching for Muonium to Antimuonium Conversion
L.Willmann (1), P.V.Schmidt (1), H.P.Wirtz (2), R.Abela (3), V.Baranov, (4), J.Bagaturia (5), W.Bertl (3), R.Engfer (2), A.Grossmann (1), V.W.Hughes, (6), K.Jungmann (1), V.Karpuchin (4), I.Kisel (4), A.Korenchenko (4),, S.Korenchenko (4), N.Kravchuk (4), N.Kuchinsky (4)
TL;DR
This paper reports a new upper limit on muonium to antimuonium conversion probability, constraining certain beyond-standard-model theories and ruling out specific theoretical models.
Contribution
It establishes the most stringent experimental upper limit on muonium-antimuonium conversion probability to date, impacting extensions of the standard model.
Findings
Upper limit for conversion probability: 8.2 x 10^{-11}
Constraints on R-parity violating supersymmetry parameters
Exclusion of certain GUT models
Abstract
A new upper limit for the probability of spontaneous muonium to antimuonium conversion was established at (90%C.L.) in 0.1~T magnetic field, which implies consequences for speculative extensions to the standard model. Coupling parameters in R-parity violating supersymmetry and the mass of a flavour diagonal bileptonic gauge boson can be significantly restricted. A Z model with radiative mass generation through heavy lepton seed and the minimal version of 331-GUT models are ruled out.
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