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Particles and Fields
Eur. Phys. J. C 26, 201-207 (2002)
DOI: 10.1140/epjc/s2002-01059-4

Tests of CPT invariance for neutral flavored meson-antimeson mixing

G.V. Dass1 and W. Grimus2

1  Physics Department, Indian Institute of Technology, Powai, Mumbai 400076, India
2  Institut für Theoretische Physik, Universität Wien, Boltzmanngasse 5, 1090 Wien, Austria

(Received: 5 August 2002 / Published online: 25 October 2002 )

We focus on two aspects of CPT invariance in neutral meson-antimeson ( $M^0 \bar M^0$) mixing: (1) tests of CPT invariance, using only the property of "lack of vacuum regeneration", which occurs as a part of the well-known Lee-Oehme-Yang (LOY) theory; (2) methods for extracting the CPT-violating mixing parameter $\theta$ through explicit calculations by fully using the LOY-type theory. In the latter context, we demonstrate the importance of the C-even $\vert M^0 \bar M^0 \rangle$ state. In particular, by measuring the time dependence of opposite-sign dilepton events arising from decays of the C-even and C-odd $\vert M^0 \bar M^0 \rangle$ states, $\theta$ may be disentangled from the parameters $\lambda_+$ and $\bar \lambda_-$ characterizing violations of the $\Delta F = \Delta Q$ rule. Furthermore, these two parameters may also be determined. The same is true if one uses like-sign dilepton events arising from only the C-even $\vert M^0 \bar M^0 \rangle$ state.

© Società Italiana di Fisica, Springer-Verlag 2002