Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2005-09-13
Physics
High Energy Physics
High Energy Physics - Phenomenology
13 pages, LaTeX
Scientific paper
Quasi-degenerate neutral systems like a (K, \bar{K}) type are investigated in Quantum Field Theory (QFT). A constant mass matrix as the one used in Quantum Mechanics (QM) can only be introduced as a linear approximation to QFT. We study the phenomenological consequences of the differences between the QFT and QM treatments. The role of ``spurious'' states with zero norm at the poles is emphasized. The K_L-K_S mass splitting triggers a tiny difference between the CP violating parameters \epsilon_L and \epsilon_S, without any violation of TCP. Non-vanishing semi-leptonic asymmetry delta_S - \delta_L does not signal TCP violation (usual claims not withstanding), while A_{TCP} keeps vanishing when TCP is good symmetry.
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