A search for relativistic quarks in the cosmic radiation

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Abstract
A scintillation counter telescope of aperture 047 m2 sr and incorporating layers of crossed neon flash tubes has been used to search for relativistic e/3 and 2e/3 quarks in the near-vertical cosmic radiation at sea level. Events were selected where the scintillator pulse heights were as expected for quarks and the corresponding flash tube records were studied. No events satisfied all the rigorous acceptance criteria and only upper limits can be given for the quark flux. These are, at the 90% confidence limits: −10 cm−2 s−1 sr−1 for relativistic e/3 quarks and −11 cm−2 s−1 sr−1 for relativistic 2e/3 quarks.

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