Year: 1999
Type: article
Abstract: Using the QCD sum rule approach, we calculate the electric dipole moment of the neutron induced by a vacuum $\ensuremath{\theta}$ angle to approximately $40%$-- $50%$ precision, ${d}_{n}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}1.2\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}16}\overline{\ensuremath{\theta}}e\mathrm{cm}$. Combined with the new experimental bound, this translates into the limit $|\overline{\ensuremath{\theta}}|<6\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}10}$.
Source: Physical Review Letters
Authors: Maxim Pospelov, Adam Ritz
Institution: University of Minnesota
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W2006505949