Abstract
A search has been made for relativistic leptonic quarks (chargese/3 and 2e/3) in the cosmic radiation near sea level using a narrow-angle scintillation counter telescope. The apparatus was oriented at large zenith angles (>75°) and thus used the atmosphere as an extended filter for hadronic quarks. A null result was obtained, leading to upper limits on such quark intensities of ∼1.7·10−8 cm−2 sr−1 s−1 at the 90% confidence level.
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