MIT Licence DOI

The purpose of this website is to host data files and python notebooks to create limit plots on axions, axion-like particles and dark photons. Please email me [ciaran.aj.ohare@gmail.com] if you have any questions/comments/complaints or if you would like your limit to be added to these plots.

Disclaimer: the limits on this website here have been collected from an extremely wide array of papers (not all of them published) and from several different sub-fields. There may be wildly varying levels of uncertainty, assumption, model dependence, and importantly, differing levels of statistical rigour. There is not necessarily any fixed convention for what even constitutes a bound. This goes especially for experimental projections, which vary considerably in their respective levels of optimism. Therefore, one should exercise some caution when reading these plots: they are not intended to be the definitive word on the status of the axion. I more see them as a way to advertise the many ways one can search, and give a rough picture for what is allowed and what is ruled out. Some may see my inclusion of certain bounds as being overly democratic, however I felt that it was important for this extremely active field to be fully reflected in these plots.


Axion-photon coupling

Data files
Plot (pdf, png)
Plot with projections (pdf, png)
Plot of dimensionless coupling (pdf, png)
Plot of dimensionless coupling with projections (pdf, png)


Axion-electron coupling

Data files
Plot (pdf, png)
Plot with projections (pdf, png)
 
 


Axion-neutron coupling

Data files
Plot (pdf, png)
Plot with projections (pdf, png)
 
 
 


Axion CP-violating couplings

Data files
Plot for scalar nucleon coupling (pdf, png)
Plot for electron-electron coupling (pdf, png)
Plot for nucleon-nucleon coupling (pdf, png)
 


Dark photons

Data files
Plot (pdf, png)
 
 
 
 

Acknowledgements

Thank you to: Masha Baryakhtar, Itay Bloch, Andrea Caputo, Raymond Co, Chris Dessert, Akash Dixit, Maurizio Giannotti, Alexander Gramolin, Sebastian Hoof, Hai-Jun Li, David Marsh, Alex Millar, Pablo Quílez, Javier Redondo, Jan Schuette-Engel, Philip Sørensen, Edoardo Vitagliano, and Sam Witte for comments, corrections and suggestions that have greatly helped improve these plots.