Bounds on rare decays of η and η′ mesons from the neutron EDM

Alexey S. Zhevlakov, Mikhail Gorchtein, Astrid N.Hiller Blin, Thomas Gutsche, Valery E. Lyubovitskij

Результат исследований: Материалы для журналаСтатья

1 цитирование (Scopus)

Выдержка

We provide model-independent bounds on the rates of rare decays η(η′)→ππ based on experimental limits on the neutron electric dipole moment (nEDM). Starting from phenomenological η(η′)ππ couplings, the nEDM arises at the two-loop level. The leading-order relativistic chiral perturbation theory calculation with the minimal photon coupling to charged pions and a proton inside the loops leads to a finite, counterterm-free result. This is an improvement upon previous estimates which used approximations in evaluating the two-loop contribution and were plagued by divergences. While constraints on the η(η′)ππ couplings in our phenomenological approach are somewhat milder than in the picture with the QCD θ term, our calculation means that whatever the origin of these couplings, the decays η(η′)→2π will remain unobservable in the near future.

Язык оригиналаАнглийский
Номер статьи031703
ЖурналPhysical Review D
Том99
Номер выпуска3
DOI
СостояниеОпубликовано - 1 фев 2019

Отпечаток

mesons
neutrons
decay
electric moments
electric dipoles
dipole moments
divergence
pions
perturbation theory
quantum chromodynamics
protons
photons
estimates
approximation

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

Цитировать

Bounds on rare decays of η and η′ mesons from the neutron EDM. / Zhevlakov, Alexey S.; Gorchtein, Mikhail; Blin, Astrid N.Hiller; Gutsche, Thomas; Lyubovitskij, Valery E.

В: Physical Review D, Том 99, № 3, 031703, 01.02.2019.

Результат исследований: Материалы для журналаСтатья

Zhevlakov, Alexey S. ; Gorchtein, Mikhail ; Blin, Astrid N.Hiller ; Gutsche, Thomas ; Lyubovitskij, Valery E. / Bounds on rare decays of η and η′ mesons from the neutron EDM. В: Physical Review D. 2019 ; Том 99, № 3.
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