O.Yu. Andreev

  (SPBSU & NRC KI - PNPI)

Bound–bound muon transitions in muonic atoms with electron–positron pair production.
  Abstract:
Bound–bound muon transitions in muonic atoms, accompanied by the production of electron–positron pairs, were studied. It was shown that for ions with a nuclear charge of Z ≥ 24, transitions of bound muons from low-lying excited states to the 1s ground state can lead to the production of electron–positron pairs. It was found that the probability of such transitions for states with nonzero orbital angular momentum is determined primarily by the Breit interaction. It was also shown that, in general, pair production occurs predominantly through the decay of 2p states. Thus, the Breit interaction plays a key role in the process of electron–positron pair production in bound–bound muon transitions. This process opens a unique opportunity to study quantum electrodynamics in strong fields and also represents a little-studied class of non-radiative transitions accompanied by the production of electron-positron pairs.

A.P. Serebrov

  (NRC Kurchatov institute - PNPI)

Precision studies of neutron decay and the need to expand the Standard Model..

A.A. Dzyuba

  (HEPD PNPI, NRC KI)

LHCb results on measuring CP-impairment effects.
  (Presentation)
  Video