Published in
World Scientific Publishing, Modern Physics Letters A, 29(06), p. 2741-2748
DOI: 10.1142/s0217732391003195
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What Are the Anti-Particles of K L,s ?
Journal article published in 1991 by
V. S. Mathur,
S. G. Rajeev
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Abstract
We study the consequences of an anti-unitary symmetry such as CPT for an unstable quantum system described by a non-self-adjoint Hamiltonian. It is shown that CPT invariance by itself does not imply that every particle has an anti-particle of equal mass and life-time. In particular, the neutral kaons KL and KS do not have anti-particles even when CPT is conserved.