Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
1999-03-05
Phys.Lett.B452:425-433,1999
Physics
High Energy Physics
High Energy Physics - Experiment
15 pages latex 2e, five figures, one style file (cernart.csl) incorporated
Scientific paper
10.1016/S0370-2693(99)00271-3
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 annual, monthly and diurnal modulations of the observables |eta_{+-}| and phi_{+-}, that could be correlated with variations in astrophysical potentials. Within the accuracy of CPLEAR, the measured values of |eta_{+-}| and phi_{+-} are found not to be correlated with changes of the gravitational potential. We analyze data assuming effective scalar, vector and tensor interactions, and we conclude that the Principle of Equivalence between particles and antiparticles holds to a level of 6.5, 4.3 and 1.8 x 10^{-9}, respectively, for scalar, vector and tensor potentials originating from the Sun with a range much greater than the distance Earth-Sun. We also study energy-dependent effects that might arise from vector or tensor interactions. Finally, we compile upper limits on the gravitational coupling difference between K0 and K0bar as a function of the scalar, vector and tensor interaction range.
CPLEAR Collaboration
Ellis John
Mavromatos Nick E.
Nanopoulos Dimitri V.
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