Quantcast
  • Register
PhysicsOverflow is a next-generation academic platform for physicists and astronomers, including a community peer review system and a postgraduate-level discussion forum analogous to MathOverflow.

Welcome to PhysicsOverflow! PhysicsOverflow is an open platform for community peer review and graduate-level Physics discussion.

Please help promote PhysicsOverflow ads elsewhere if you like it.

News

New printer friendly PO pages!

Migration to Bielefeld University was successful!

Please vote for this year's PhysicsOverflow ads!

Please do help out in categorising submissions. Submit a paper to PhysicsOverflow!

... see more

Tools for paper authors

Submit paper
Claim Paper Authorship

Tools for SE users

Search User
Reclaim SE Account
Request Account Merger
Nativise imported posts
Claim post (deleted users)
Import SE post

Users whose questions have been imported from Physics Stack Exchange, Theoretical Physics Stack Exchange, or any other Stack Exchange site are kindly requested to reclaim their account and not to register as a new user.

Public \(\beta\) tools

Report a bug with a feature
Request a new functionality
404 page design
Send feedback

Attributions

(propose a free ad)

Site Statistics

174 submissions , 137 unreviewed
4,308 questions , 1,640 unanswered
5,089 answers , 21,602 comments
1,470 users with positive rep
635 active unimported users
More ...

  Chiral estimates of the electric dipole moment of the neutron in quantum chromodynamics

Originality
+ 3 - 0
Accuracy
+ 3 - 0
Score
6.97
109 views
Referee this paper: cern.ch/133382 by R.J. Crewther, Di P Vecchia, (show more)

Please use comments to point to previous work in this direction, and reviews to referee the accuracy of the paper. Feel free to edit this submission to summarise the paper (just click on edit, your summary will then appear under the horizontal line)

(Is this your paper?)


This 1979 paper by R.J. Crewther, P. Di Vecchia, G. Veneziano, and E. Witten  estimates the instanton effects in low-energy QCD in leading order in chiral effective theory. The chiral lagrangian describing the pion-octet is called current algebra here, as a nod to Gell-Mann. The paper finds the leading order effects of a theta-angle on eta decays and on the neutron electric dipole moment, in the limit of small explicit symmetry breaking, so small up down masses, and small pion mass. It uses the bound on neutron electric dipole moment to bound the magnitude of $\theta$ away from the CP invariant value of 0. Independently, it calculates Gell-Mann Okubo style mass relations in the pion octet for $\theta=\pi$ to explicitly rule out the other CP symmetric value.

summarized by Arnold Neumaier , Ron Maimon
paper authored Sep 3, 1979 to hep-ph by  (no author on PO assigned yet) 
  • [ revision history ]
    edited Sep 17, 2014 by Ron Maimon

    Your Review:





    user contributions licensed under cc by-sa 3.0 with attribution required

    Your rights
    ...