| DATE: |
2009-02-26 11:00 - 12:00 |
| PLACE: |
Kenkyu Honkan 2F RM 220 |
| TITLE: |
A new field-theoretical treatment of neutrino oscillations |
| CONTACT: |
KIKUCHI Tatsuru |
| SPEAKER: |
Prof. Vadim A. Naumov (Joint Institute for Nuclear Research, Dubna) |
| ABSTRACT: |
An approach toward the problem of vacuum neutrino oscillations is suggested based upon the methods of Quantum Field Theory (QFT). The neutrino oscillation phenomenon is treated as a result of interference of macroscopic Feynman diagrams describing a lepton number violating process in which the massive neutrino fields are the internal lines (propagators). The external lines of the diagrams are described by relativistic wave packets (covariant superpositions of the standard Fock states). The main consequence of this approach is that the standard quantum-mechanical formulas for the neutrino flavor transition probabilities have a limited range of applicability and the QFT corrections depend upon
* (a) the distance between the neutrino production and absorption regions (the "source" and "detector", respectively);
* (b) the dimensions of the source and detector and the time of their steady-state operation;
* (c) the reaction types in the source and detector and the phase-space domains of these reactions;
* (d) the momentum dispersions of the external wave packets determined by the environment and "prehistory" of their creation. |
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