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Measurement of the Michel Parameter xi" in Polarized Muon Decay and Implications on Exotic Couplings of the Leptonic Weak Interaction
R. Prieels, O. Naviliat-Cuncic, P. Knowles +8
The Michel parameter xi" has been determined from a measurement of the longitudinal polarization of positrons emitted in the decay of polarized and depolarized muons. The result, x…
An Improved Limit on Invisible Decays of Positronium
A. Badertscher, P. Crivelli, W. Fetscher +6
The results of a new search for positronium decays into invisible final states are reported. Convincing detection of this decay mode would be a strong evid ence for new physics bey…
A new experiment to search for the invisible decay of the orthopositronium
A. Badertscher, P. Crivelli, W. Fetscher +4
We propose an experiment to search for invisible decays of orthopositronium (o-Ps) with a 90% confidence sensitivity in the branching ratio as low as . Evidence for this d…
An apparatus to search for mirror dark matter via the invisible decay of orthopositronium in vacuum
A. Badertscher, A. Belov, P. Crivelli +9
Mirror matter is a possible dark matter candidate. It is predicted to exist if parity is an unbroken symmetry of the vacuum. The existence of the mirror matter, which in addition t…
Tests of the Equivalence Principle with Neutral Kaons
CPLEAR Collaboration, J. Ellis, N. E. Mavromatos +1
We test the Principle of Equivalence for particles and antiparticles, using CPLEAR data on tagged K0 and K0bar decays into pi^+ pi^-. For the first time, we search for possible ann…
Test of CPT Symmetry and Quantum Mechanics with Experimental data from CPLEAR
R. Adler, etal, J. Ellis +3
We use fits to recent published CPLEAR data on neutral kaon decays to and to constrain the CPT--violation parameters appearing in a formulation of the neutral kaon s…