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30 May 2022 to 4 June 2022
Virtual Seoul
Asia/Seoul timezone

Describing neutrino oscillations in QFT without wave packets

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Virtual Seoul

Virtual Seoul

Poster Neutrino oscillation Poster


Dr Igor Volobuev ( Institute of Nuclear Physics, Moscow Lomonosov State University)


Nowadays the standard way to describe neutrino oscillations is the quantum-mechanical approach in terms of plane waves, because the current description of the phenomenon within quantum field theory with the help of localized wave packets is very bulky [1]. However, there was an earlier attempt to describe neutrino oscillations within the standard Feynman diagram technique [2]. We elaborate upon this description and show that the processes of neutrino oscillations can be consistently described in the framework of a new quantum field-theoretical approach without use of the neutrino flavor states and wave packets. It is based on the Feynman diagram technique with a modified distance-dependent propagator, which takes into account the geometry of neutrino oscillation experiments [3,4]. The advantages of this description are physical clearness and technical simplicity. Within this approach, we discuss specific examples of neutrino oscillation processes in vacuum and a magnetic field, where the neutrinos are detected through the weak charged- and neutral-current interactions [5].

  1. C. Giunti, C.W. Kim, J.A. Lee and U.W. Lee, On the treatment of neutrino oscillations without resort to weak eigenstates, Phys. Rev. D 48, 4310 (1993).
  2. I.Yu. Kobzarev, B.V. Martemyanov, L.B. Okun and M.G. Shchepkin, Sum rules for neutrino oscillations, Sov. J. Nucl. Phys. 35, 708 (1982).
  3. V.O. Egorov and I.P. Volobuev, Neutrino oscillation processes in a quantum-field-theoretical approach, Phys. Rev. D 97, no.9, 093002 (2018).
  4. V.O. Egorov and I.P. Volobuev, Coherence length of neutrino oscillations in a quantum field-theoretical approach, Phys. Rev. D 100, no.3, 033004 (2019).
  5. V. Egorov and I. Volobuev, Quantum field-theoretical description of neutrino oscillations in magnetic field, arXiv:2107.11570 [hep-ph].

Primary authors

Dr Vadim Egorov (Institute of Nuclear Physics, Moscow Lomonosov State University) Dr Igor Volobuev ( Institute of Nuclear Physics, Moscow Lomonosov State University)

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