Non-derivative axionic couplings to nucleons at large and small N

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http://hdl.handle.net/10138/312448

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Bigazzi , F , Cotrone , A L , Järvinen , M & Kiritsis , E 2020 , ' Non-derivative axionic couplings to nucleons at large and small N ' , Journal of High Energy Physics , no. 1 , 100 . https://doi.org/10.1007/JHEP01(2020)100

Title: Non-derivative axionic couplings to nucleons at large and small N
Author: Bigazzi, Francesco; Cotrone, Aldo L.; Järvinen, Matti; Kiritsis, Elias
Contributor: University of Helsinki, Helsinki Institute of Physics
Date: 2020-01-17
Language: eng
Number of pages: 63
Belongs to series: Journal of High Energy Physics
ISSN: 1029-8479
URI: http://hdl.handle.net/10138/312448
Abstract: Among the possible CP-odd couplings of the axion to ordinary matter, the most relevant ones for phenomenology are the Yukawa couplings to nucleons. We analyze such non-derivative couplings within three different approaches: standard effective field theory, the Skyrme model and holographic QCD. In all the cases, the couplings can be related to the CP-odd non-derivative couplings to nucleons of the low-lying mesons and the eta '. Using the effective field theory approach we discuss how to derive the expressions for the CP-odd interaction terms as functions of the parameters of the effective Lagrangian at generic number of colors N-c and flavors N-f. Then, we compute the CP-odd couplings to nucleons of the axion, the eta ' and the pseudo-Goldstone mesons in both the Skyrme and the holographic QCD model with N-f = 2, 3. We present model-independent expressions for the coefficients of the non-derivative axion-nucleon couplings. This allows us to provide quantitative estimates of these couplings.
Subject: Chiral Lagrangians
Cosmology of Theories beyond the SM
Gauge-gravity correspondence
1/N Expansion
ELECTRIC-DIPOLE MOMENT
STRONG-CP PROBLEM
SKYRME MODEL
STATIC PROPERTIES
THETA-TERM
NEUTRON
BARYONS
LIMIT
INSTANTONS
DEPENDENCE
114 Physical sciences
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