Publications
Publication Information
| Title | Nucleon matrix element of Weinberg's CP-odd gluon operator from the instanton vacuum |
| Authors | Christian Weiss |
| JLAB number | JLAB-THY-21-3342 |
| LANL number | arXiv:2103.13471 |
| Other number | DOE/OR/23177-5158 |
| Document Type(s) | (Journal Article) |
| Associated with EIC: | No |
| Supported by Jefferson Lab LDRD Funding: | No |
| Funding Source: | Nuclear Physics (NP) |
|
Journal Compiled for Physics Letters B Volume 819 Page(s) 136447 Refereed | |
| Publication Abstract: | We calculate the nucleon matrix element of Weinberg's dimension-6 CP-odd gluon operator f^{abc} (Fdual_{mu nu})^a (F^{mu rho})^b (F^nu_rho)^c in the instanton vacuum. In leading order of the instanton packing fraction, the dimension-6 operator is effectively proportional to the topological charge density (Fdual_{mu nu})^a (F^{mu nu})^a, whose nucleon matrix element is given by the flavor-singlet axial charge and constrained by the U(1)_A anomaly. The nucleon matrix element of the dimension-6 operator is obtained substantially larger than in other estimates, because of the strong localization of the nonperturbative gluon fields in the instanton vacuum. We argue that the neutron electric dipole moment induced by the dimension-6 operator is nevertheless of conventional size. |
| Experiment Numbers: | other |
| Group: | THEORY CENTER |
| Document: | |
| DOI: | https://doi.org/10.1016/j.physletb.2021.136447 |
| Accepted Manuscript: | 1-s2.0-S0370269321003877-main.pdf |
| Supporting Documents: | |
| Supporting Datasets: | |