T. Akesson et al., A STUDY OF ELECTRON-MUON PAIR PRODUCTION IN 450 GEV C PBE COLLISIONS/, Zeitschrift fur Physik. C, Particles and fields, 72(3), 1996, pp. 429-436
We report on the production of e(+/-)mu(-/+) pairs in 450 GeV/c pBe co
llisions at the CERN SPS. The e mu signal, which has average missing e
nergy of 21 GeV, is shown to be consistent with expectations from char
m decay, and implies a sigma x B for <c(c)over bar> production in p-nu
cleon collisions of 0.63 +/- 0.35 mu b. Alternatively, using an estima
te of charm production from other experiments, the data imply a 95% co
nfidence level upper limit of 1.16 mu b on any new physics process whi
ch produces e(+/-)mu(-/+).