neutron electric dipole moment
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2021 ◽  
Vol 2021 (9) ◽  
Author(s):  
Ulrich Haisch ◽  
Gabriël Koole

Abstract In the context of the Standard Model effective field theory we derive direct and indirect bounds on chromodipole operators involving the bottom and charm quark. We find that the experimental upper limit on the neutron electric dipole moment puts severe constraints on the imaginary parts of the Wilson coefficients of both chromodipole operators. The magnitudes of the Wilson coefficients are instead only weakly constrained by dijet searches and Z-boson production in association with bottom-quark jets. Flavour physics does not provide meaningful bounds.


2021 ◽  
Vol 2021 (7) ◽  
Author(s):  
Alessandro Valenti ◽  
Luca Vecchi

Abstract We analyze the Nelson-Barr approach to the Strong CP Problem. We derive the necessary conditions in order to simultaneously reproduce the CKM phase and the quark masses. Then we quantify the irreducible contributions to the QCD topological angle, namely the corrections arising from loops of the colored fermion mediators that characterize these models. Corrections analytic in the couplings first arise at 3-loop order and are safely below current bounds; non-analytic effects are 2-loop order and decouple as the mediators exceed a few TeV. We discuss collider, electroweak, and flavor bounds and argue that most of the parameter space above the TeV scale is still allowed in models with down-type mediators, whereas other scenarios are more severely constrained. With two or more families of mediators the dominant experimental bound is due to the neutron electric dipole moment.


2021 ◽  
Vol 103 (6) ◽  
Author(s):  
N. J. Ayres ◽  
G. Ban ◽  
G. Bison ◽  
K. Bodek ◽  
V. Bondar ◽  
...  

2021 ◽  
Vol 103 (5) ◽  
Author(s):  
C. Alexandrou ◽  
A. Athenodorou ◽  
K. Hadjiyiannakou ◽  
A. Todaro

2019 ◽  
Vol 14 (11) ◽  
pp. P11017-P11017 ◽  
Author(s):  
M.W. Ahmed ◽  
R. Alarcon ◽  
A. Aleksandrova ◽  
S. Baeßler ◽  
L. Barron-Palos ◽  
...  

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