A search for neutral penetrating particles has been made by use of an 800-GeV proton beam incident on the magnetized beam dump of the Fermilab experiment 605/772 spectrometer. Limits on the mass and couplings of such particles are presented. These improve on the limits obtained from a previous run with the same apparatus, and axions coupling only to e+e- are now ruled out up to masses of 2.7 MeV/c2.
ASJC Scopus subject areas
- Physics and Astronomy (miscellaneous)