Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Violation of Time-Reversal Invariance and CPLEAR Measurements   Motivated by the recent CPLEAR measurement on the time-reversal
non-invariance, we review the situation concerning the experimental
measurements of charge conjugation, parity violation and time reversibility, in
systems with non-Hermitean Hamiltonians. This includes in particular neutral
meson systems, like K0-barK0, D0-barD0 and B0-barB0. We discuss the formalism
that describes particle-antiparticle mixing and time evolution of states,
paying particular emphasis to the orthogonality conditions of incoming and
outgoing states. As a result, we confirm that the CPLEAR experiment makes a
direct measurement of violation of time-reversal without any assumption of
unitarity and CPT-violation. The asymmetry which signifies T-violation, is
found to be independent of time and decay processes.

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The categories of this paper are: mtrl-th
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The categories of this paper are: econ
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The categories of this paper are: atom-ph
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The categories of this paper are: nlin
3
The categories of this paper are: physics
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The categories of this paper are: nucl-ex
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The categories of this paper are: gr-qc
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The categories of this paper are: funct-an
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The categories of this paper are: stat
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The categories of this paper are: chao-dyn
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The categories of this paper are: alg-geom
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The categories of this paper are: solv-int
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The categories of this paper are: chem-ph
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The categories of this paper are: math
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The categories of this paper are: supr-con
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The categories of this paper are: astro-ph