A new upper limit for the probability of spontaneous muonium to antimuonium conversion was established at P MM ≤ 8.2 · 10 −11 (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 8 model with radiative mass generation through heavy lepton seed and the minimal version of 331-GUT models are ruled out.

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Parity nonconservation in p-p scattering has been studied by comparing the cross sections d + , and a" for longitudinally polarized 45-MeV protons of positive and negative helicity. The longitudinal analyzing power is found to be A z = (-3.2 ± 1.1) x 10"" 7 . The quoted uncertainty includes the statistical error, the uncertainties of corrections applied, and estimates of systematic effects.It has been suggested 1 that a possible parity nonconservation in the nucleon-nucleon interaction can be studied by comparing the p-p cross sections a + and o~ for an incident beam of longitudinally polarized protons of positive and negative helicity. Since the scattering cross section is proportional to the ratio of the number of scattered protons, N s , to the number of incident protons, N p , the longitudinal analyzing power A z can be written as

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