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We have performed a high-sensitivity search for massive long-lived particles produced at 2.5 mrad by 400-GeV/c protons on a beryllium target using time-of-flight, Cherenkov, and calorimetric techniques. A total of 10¹¹ light particles (π^-,K^-,p̄) was sampled at 70 GeV/c. This experiment places a limit of 1.1×{}10^-37 cm²/(GeV/c)² ·{} nucleon on the invariant cross section for the production of stable particles in the mass range of 4 to 10 GeV/c².
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Cutts et al. (1978) studied this question.
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