August 28, 2016 to September 4, 2016
Europe/Athens timezone

The Neutron Electric Dipole Moment from lattice QCD

Aug 30, 2016, 6:30 PM
20m
Clio (Makedonia Palace)

Clio

Makedonia Palace

Section B: Light Quarks Section B

Speaker

Dr Andreas Athenodorou (University of Cyprus)

Description

We calculate the neutron electric dipole moment within the framework of lattice QCD. In particular we
analyze configurations produced with $N_f=2+1+1$ twisted mass fermions with light quark mass which
corresponds to pion mass of 370 MeV. We do so by extracting the $CP$-odd form factor $F_3$ at the limit of
zero momentum transfer and at small values of the $\theta$ vacuum angle. The zero momentum limit is
realized via fitting the momentum dependence by a dipole fit as well as using position space methods.
The computation of $F_3$ requires the calculation of the topological charge. We measure the field
theoretical topological charge via cooling and the gradient flow using the Wilson, Symanzik tree-level
improved and Iwasaki actions. Our analysis yields a value for the neutron electric dipole moment of
−0.045(6)(1) e·fm in units of $\theta$.

Primary author

Dr Andreas Athenodorou (University of Cyprus)

Co-authors

Constantia Alexandrou Prof. Giannis Koutsou (The Cyprus Institute) Karl Jansen (DESY) Dr Konstantin Ottnad (Bethe Center for Theoretical Physics, Universitat Bonn) Dr Kyriakos Hadjiyiannakou (The George Washington University) Dr Marcus Petschlies (Bethe Center for Theoretical Physics, Universitat Bonn) Dr Martha Constantinou (The Cyprus Institute)

Presentation materials