STI Publications - View Publication Form #16542
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Publication Information
| Title | Nucleon matrix element of Weinberg's CP-odd gluon operator from the instanton vacuum | ||||
| 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. | ||||
| Author(s) | Christian Weiss | ||||
| Publication Date | August 2021 | ||||
| Document Type | Journal Article | ||||
| Primary Institution | Thomas Jefferson National Accelerator Facility, Newport News | ||||
| Affiliation | Theory & Comp Physics / THEORY CENTER / THEORY CENTER | ||||
| Funding Source | Nuclear Physics (NP) | ||||
| Proprietary? | No | ||||
| This publication conveys | Technical Science Results | ||||
| Document Numbers |
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| Associated with an experiment | No | ||||
| Associated with EIC | No | ||||
| Supported by Jefferson Lab LDRD Funding | No |
Journal Article
| Journal Name | Physics Letters B |
| Refereed | Yes |
| Volume | 819 |
| Issue | |
| Page(s) | 136447 |
Attachments/Datasets/DOI Link
| Document(s) |
weinberg_jlab.pdf
(STI Document)
1-s2.0-S0370269321003877-main.pdf
(Accepted Manuscript)
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| DOI Link | |
| Dataset(s) | (none) |
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