Oscillations of neutrinos and mesons in quantum field theory

Details Oscillations of neutrinos and mesons in quantum field theory Oscillations of neutrinos and mesons in quantum field theory

2001-09-13

arxiv.org/abs/hep-ph/0109119v2

Phys.Rept. 375 (2003) 105-218

Physics

High Energy Physics

High Energy Physics - Phenomenology

v2, 124 pages, 10 figures (7 more); updated review of the literature; complete derivation of the oscillation probability at sh

Scientific paper

10.1016/S0370-1573(02)00538-0

This report deals with the quantum field theory of particle oscillations in vacuum. We first review the various controversies regarding quantum-mechanical derivations of the oscillation formula, as well as the different field-theoretical approaches proposed to settle them. We then clear up the contradictions between the existing field-theoretical treatments by a thorough study of the external wave packet model. In particular, we show that the latter includes stationary models as a subcase. In addition, we explicitly compute decoherence terms, which destroy interferences, in order to prove that the coherence length can be increased without bound by more accurate energy measurements. We show that decoherence originates not only in the width and in the separation of wave packets, but also in their spreading through space-time. In this review, we neither assume the relativistic limit nor the stability of oscillating particles, so that the oscillation formula derived with field-theoretical methods can be applied not only to neutrinos but also to neutral K and B mesons. Finally, we discuss oscillations of correlated particles in the same framework.

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