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SUMMARY:Description of processes passing at finite space-time intervals in
  the framework of quantum field theory
DTSTART;VALUE=DATE-TIME:20181024T150000Z
DTEND;VALUE=DATE-TIME:20181024T151500Z
DTSTAMP;VALUE=DATE-TIME:20260308T173513Z
UID:indico-contribution-1362@cern.ch
DESCRIPTION:Speakers: Vadim Egorov (M.V.Lomonosov Moscow State University\
 , Skobeltsyn Institute of Nuclear Physics (SINP MSU))\nWe consider a novel
  quantum field-theoretical approach to the description of processes passin
 g at finite space-time intervals based on the Feynman diagram technique in
  the coordinate representation. The most know processes of this type are n
 eutrino and neutral kaon oscillations\, which are described nowadays only 
 in an eclectic quantum-mechanical approach. The experimental setting of th
 ese processes requires one to adjust the rules of passing to the momentum 
 representation in the Feynman diagram technique in accordance with it\, wh
 ich leads to a modification of the Feynman propagator in the momentum repr
 esentation. The approach does not make use of wave packets\, both initial 
 and final particle states are described by plane waves\, which simplifies 
 the calculations considerably. The description is very similar to the usua
 l one performed in the framework of the Feynman diagram technique in the m
 omentum representation\, where the standard propagators are replaced by th
 eir modified versions. We demonstrate the validity of the formalism by app
 lying it to three processes: neutrino oscillations\, unstable particle dec
 ay and neutral kaon oscillations. It is shown that the considered approach
  correctly reproduces the known results.\n\nhttps://indico.particle.mephi.
 ru/event/22/contributions/1362/
LOCATION:Hotel Intourist Kolomenskoye 4* Alekseevskiy hall
URL:https://indico.particle.mephi.ru/event/22/contributions/1362/
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