Lower limit for the mass of the intermediate boson

Summary  The search for the muonic and the nonleptonio decays of the hypothetical intermediate boson among the neutrino events produced in the CERN neutrino experiment has been continued and concluded. The data do not give any clear evidence for such decays. Comparing the rate of possible boson reactions, observed in the spark chamber and the bubble chamber, with the calculated production rate, we arrive at a lower limit for the boson mass, ranging from 1.7 to 2.2 GeV/c2 for various assumptions about the relative abundanceB of leptonic decays (Table VI).