25 February 2019 to 1 March 2019
Budker INP
Asia/Novosibirsk timezone

The neutron EDM and bounds on rare decays of eta and eta-prime mesons

28 Feb 2019, 18:10
20m
Conference room

Conference room

Invited Oral Baryon Form Factors and proton radius Baryon formfactors

Speaker

Dr Alexey Zhevlakov (TSU)

Description

Here will be present an improved estimate of the CPV coupling constants of the and 0 mesons to two pions using upper limits from data on the neutron electric dipole moment (nEDM). Using a phenomenological Lagrangian approach based on nonderivative couplings of the pseudoscalar mesons with nucleons, we include the full momentum dependence of the eta-pi-pi or eta-prime-pi-pi couplings in a two-loop approach to the nEDM calculation. Furthermore, this approach enables the inclusion of charged pion loops, therefore allowing for the leading electric photon minimal couplings. The upper limits for the rates of the CPV decays eta(eta-prime) into pair of pions that we derive are by orders of magnitude more stringent than those from the existing experiments so far.

Summary

An upper limit for the Theta- parameter in the Peccei-Quinn mechanism from the f_{\eta^\prime\pi\pi} constant:
\bar{Theta} < 2.3 \cdot 10^{-9}.

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