DOI 10.1007/s100520000435
CP, T and/or CPT violations in the K0-
system
Implications of the KTeV, NA48 and CPLEAR results
Y. Kouchi - Y. Takeuchi - S.Y. Tsai
Atomic Energy Research Institute and Department of
Physics,
College of Science and Technology, Nihon University,
Kanda-Surugadai, Chiyoda-ku, Tokyo 101-8308, Japan
Received: 14 February 2000 / Revised version: 24 April 2000
/
Published online: 8 September 2000 - © Springer-Verlag 2000
Abstract
The possible violation of the CP, T and/or CPT symmetries in the
K0-
system is studied from a phenomenological point of view. With
this aim,
we first introduce parameters which represent the violation of
these
symmetries in the
mixing parameters and decay amplitudes in a convenient and
well-defined way and, treating these parameters as small, derive
formulas which relate them to the
experimentally measured quantities. We then perform numerical
analyses, with the aid of the Bell-Steinberger relation, to
derive constraints on these symmetry-violating parameters,
firstly paying particular attention to the results
reported by the KTeV Collaboration and the NA48 Collaboration,
and then
with the results reported by the CPLEAR Collaboration as well
taken
into account. A case study, in
which either CPT symmetry or T symmetry is assumed, is also
carried out. It is demonstrated that the CP and T symmetries
are
violated definitively at the
level of 10-4 in 
decays and presumably at the level
of 10-3 in the K0-
mixing, and that the
Bell-Steinberger relation helps us to
establish that CP and T violations are definitively present
in
K0-
mixing and to test CPT symmetry to a level of
.
Copyright Società Italiana di Fisica, Springer-Verlag 2000
