Bounds on rare decays of η and η′ mesons from the neutron EDM; Physical Review D; Vol. 99, iss. 3

Bounds on rare decays of η and η′ mesons from the neutron EDM; Physical Review D; Vol. 99, iss. 3

Bibliographic Details
Parent link:Physical Review D: covering particles, fields, gravitation, and cosmology
Vol. 99, iss. 3.— 2019.— [031703(R), 6 p.]
Corporate Author: Национальный исследовательский Томский политехнический университет Исследовательская школа физики высокоэнергетических процессов
Other Authors: Zhevlakov A. S. Aleksey Seregeevich, Gorchtein M. Mikhail, Blin A. H. Astrid Hiller, Gutsche T. Thomas, Lyubovitskiy (Lyubovitskij) V. E. Valery Efimovich
Summary:Title screen
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.
Режим доступа: по договору с организацией-держателем ресурса
Language:English
Published: 2019
Subjects:
электронный ресурс
труды учёных ТПУ
распады
мезоны
Online Access:https://doi.org/10.1103/PhysRevD.99.031703
Format: Electronic Book Chapter
KOHA link:https://koha.lib.tpu.ru/cgi-bin/koha/opac-detail.pl?biblionumber=660821

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