31 research outputs found
Unraveling models of CP violation through electric dipole moments of light nuclei
We show that the proposed measurements of the electric dipole moments of
light nuclei in storage rings would put strong constraints on models of
flavor-diagonal CP violation. Our analysis is exemplified by a comparison of
the Standard Model including the QCD theta term, the minimal left-right
symmetric model, a specific version of the so-called aligned two-Higgs doublet
model, and briefly the minimal supersymmetric extension of the Standard Model.
By using effective field theory techniques we demonstrate to what extend
measurements of the electric dipole moments of the nucleons, the deuteron, and
helion could discriminate between these scenarios. We discuss how measurements
of electric dipole moments of other systems relate to the light-nuclear
measurements.Comment: Published versio
P- and T-Violating Lagrangians in Chiral Effective Field Theory and Nuclear Electric Dipole Moments
A scheme to derive hadronic interactions induced by effective multi-quark
terms is presented within the framework of chiral effective field theory. It is
employed to work out the list of parity- and time-reversal-symmetry-violating
hadronic interactions that are relevant for the computation of nuclear
contributions to the electric dipole moments of the hydrogen-2, helium-3 and
hydrogen-3 nuclei. We also derive the scattering and Faddeev equations required
to compute electromagnetic form factors in general and electric dipole moments
in particular.Comment: 69 pages, 1 figure, revised version, accepted for publication in
Annals of Physic
Probing exotic phenomena at the interface of nuclear and particle physics with the electric dipole moments of diamagnetic atoms: A unique window to hadronic and semi-leptonic CP violation
The current status of electric dipole moments of diamagnetic atoms which
involves the synergy between atomic experiments and three different theoretical
areas -- particle, nuclear and atomic is reviewed. Various models of particle
physics that predict CP violation, which is necessary for the existence of such
electric dipole moments, are presented. These include the standard model of
particle physics and various extensions of it. Effective hadron level combined
charge conjugation (C) and parity (P) symmetry violating interactions are
derived taking into consideration different ways in which a nucleon interacts
with other nucleons as well as with electrons. Nuclear structure calculations
of the CP-odd nuclear Schiff moment are discussed using the shell model and
other theoretical approaches. Results of the calculations of atomic electric
dipole moments due to the interaction of the nuclear Schiff moment with the
electrons and the P and time-reversal (T) symmetry violating
tensor-pseudotensor electron-nucleus are elucidated using different
relativistic many-body theories. The principles of the measurement of the
electric dipole moments of diamagnetic atoms are outlined. Upper limits for the
nuclear Schiff moment and tensor-pseudotensor coupling constant are obtained
combining the results of atomic experiments and relativistic many-body
theories. The coefficients for the different sources of CP violation have been
estimated at the elementary particle level for all the diamagnetic atoms of
current experimental interest and their implications for physics beyond the
standard model is discussed. Possible improvements of the current results of
the measurements as well as quantum chromodynamics, nuclear and atomic
calculations are suggested.Comment: 46 pages, 19 tables and 16 figures. A review article accepted for
EPJ
QCD and strongly coupled gauge theories : challenges and perspectives
We highlight the progress, current status, and open challenges of QCD-driven physics, in theory and in experiment. We discuss how the strong interaction is intimately connected to a broad sweep of physical problems, in settings ranging from astrophysics and cosmology to strongly coupled, complex systems in particle and condensed-matter physics, as well as to searches for physics beyond the Standard Model. We also discuss how success in describing the strong interaction impacts other fields, and, in turn, how such subjects can impact studies of the strong interaction. In the course of the work we offer a perspective on the many research streams which flow into and out of QCD, as well as a vision for future developments.Peer reviewe
The electric dipole moment of the deuteron from the QCD θ-term
The two-nucleon contributions to the electric dipole moment (EDM) of the deuteron, induced by the QCD -term, are calculated in the framework of effective field theory up-to-and-including next-to-next-to-leading order. In particular we find for the difference of the deuteron EDM and the sum of proton and neutron EDM induced by the QCD -term a value of fm. The by far dominant uncertainty comes from the CP- and isospin-violating coupling constant