Need the masses of unstable particles and their antiparticles be equal in the CPT--invariant system?

Details Need the masses of unstable particles and their antiparticles be equal in the CPT--invariant system? Need the masses of unstable particles and their antiparticles be equal in the CPT--invariant system?

2002-07-07

arxiv.org/abs/hep-ph/0207100v3

Mod.Phys.Lett. A19 (2004) 481-496

Physics

High Energy Physics

High Energy Physics - Phenomenology

LaTex2e, New comments and references added, 21 pages

Scientific paper

10.1142/S0217732304013271

We show that the real parts of diagonal matrix elements of the exact effective Hamiltonian governing the time evolution in the subspace of states of neutral kaons and similar particles can not be equal for $t > t_{0}$ ($t_{0}$ is the instant of creation of the pair $K_{0}, {\bar{K}}_{0}$) when the total system under consideration is CPT invariant but CP noninvariant. The unusual consequence of this result is that, contrary to the properties of stable particles, the masses of the unstable particle, e.g.. $K_{0}$, and its antiparticle, ${\bar{K}}_{0}$, need not be equal for $t \gg t_{0}$ in the case of preserved CPT and violated CP symmetries.

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