TY - JOUR
T1 - The electric dipole form factor of the nucleon in chiral perturbation theory to sub-leading order
AU - Mereghetti, E.
AU - de Vries, J.
AU - Hockings, W. H.
AU - Maekawa, C. M.
AU - van Kolck, U.
N1 - Funding Information:
We thank R. Timmermans for stimulating discussions. We acknowledge the hospitality of the Department of Physics at the University of Arizona (CMM), the Theory Division at CERN (EM), the Kernfysisch Versneller Instituut at the Rijksuniversiteit Groningen (EM, UvK), and the Nuclear Theory Group at the University of Washington (UvK), while this work was being carried out. This research was supported in part by an APS Forum of International Physics travel grant (CMM, UvK), by FAPERGS-Brazil under contract PROADE 2 02/1266.6 (CMM), by the Brazilian CNPq under contract 474123/2009 (CMM), by the Dutch Stichting voor Fundamenteel Onderzoek der Materie under programme 104 (JdV), by the US Department of Energy under grants DE-FG02-04ER41338 (EM, WHH, UvK) and DE-FG02-06ER41449 (EM), and by the Alfred P. Sloan Foundation (UvK) .
PY - 2011/1/24
Y1 - 2011/1/24
N2 - The electric dipole form factor (EDFF) of the nucleon stemming from the QCD θ̄ term and from the quark color-electric dipole moments is calculated in chiral perturbation theory to sub-leading order. This is the lowest order in which the isoscalar EDFF receives a calculable, non-analytic contribution from the pion cloud. In the case of the θ̄ term, the expected lower bound on the deuteron electric dipole moment is |dd|≳1.4. 10-4θ̄e fm. The momentum dependence of the isovector EDFF is proportional to a non-derivative time-reversal-violating pion-nucleon coupling, and the scale for momentum variation-appearing, in particular, in the radius of the form factor-is the pion mass.
AB - The electric dipole form factor (EDFF) of the nucleon stemming from the QCD θ̄ term and from the quark color-electric dipole moments is calculated in chiral perturbation theory to sub-leading order. This is the lowest order in which the isoscalar EDFF receives a calculable, non-analytic contribution from the pion cloud. In the case of the θ̄ term, the expected lower bound on the deuteron electric dipole moment is |dd|≳1.4. 10-4θ̄e fm. The momentum dependence of the isovector EDFF is proportional to a non-derivative time-reversal-violating pion-nucleon coupling, and the scale for momentum variation-appearing, in particular, in the radius of the form factor-is the pion mass.
KW - Chiral perturbation theory
KW - Nucleon electric dipole form factor
KW - Nucleon electric dipole moment
KW - QCD theta term
KW - Quark chromo-electric dipole moment
KW - Time reversal violation
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U2 - 10.1016/j.physletb.2010.12.018
DO - 10.1016/j.physletb.2010.12.018
M3 - Article
AN - SCOPUS:78650595917
SN - 0370-2693
VL - 696
SP - 97
EP - 102
JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
IS - 1-2
ER -