Speaker
Victor Enguita Vileta
Description
We compute the one-loop contribution to the $\bar{\theta}$-parameter of an axion-like particle (ALP) with CP-odd derivative couplings. Its contribution to the neutron electric dipole moment is shown to be orders of magnitude larger than that stemming from the one-loop ALP contributions to the up- and down-quark electric and chromoelectric dipole moments. This strongly improves existing bounds on ALP-fermion CP-odd interactions, and also sets limits on previously unconstrained couplings. The case of a general singlet scalar is analyzed as well. In addition, we explore how the bounds are modified in the presence of a Peccei-Quinn symmetry.
Primary authors
Belen Gavela Legazpi
(Universidad Autonoma de Madrid (ES))
Benjamin Grinstein
(Univ. of California San Diego (US))
Pablo Quilez Lasanta
(Universidy of California San Diego (UCSD))
Victor Enguita Vileta
