Supplementary material

On this page, we will add extra material that did not get included in the second edition and occasional updates of some of the topics which have developed since publication.

The Electric Dipole of the Electron The electric dipole moment of the electron is predicted to be quite small within the Standard Model, allowing it to be a useful probe for new physics. Here is a description of this topic within the Standard Model. (added 7/7/2014)

The trace anomaly Readers of the book might find interesting the treatment of the trace anomaly with a low energy emphasis, described in this paper by Donoghue and El-Menoufi.

Bound on CPT invariance from Hydrogen and Anti-hydrogen [See Nature 557 (2018) 71-75]:  Using one of the hyperfine components of the 1S-2S transition of magnetically trapped anti-hydrogen, the ALPHA-2 collaboration at CERN  compares the shape of the spectral line and the resonance frequency with those expected for hydrogen.  The level of agreement corresponds to an absolute sensitivity of 2 x 10-20 GeV.  By comparison, the bound on absolute energy sensitivity from K0 and K0bar is 3 x 10-20 GeV.  (added 6/5/2018)

Skip to toolbar