Abstract
A search has been made for new particles with chargeQ=2/3, 1, 4/3, 5/3 produced ine + e −-reactions at PETRA. The energy range wasE cm=27–35 GeV. No such particles were found. Upper limits for the cross-section depending on the assumed mass and production spectrum are given. ForQ=2/3 quarks with mass less than 12 GeV/c 2, upper limits\({{\sigma \left( {q\bar q} \right)} \mathord{\left/ {\vphantom {{\sigma \left( {q\bar q} \right)} {\sigma \left( {\mu \mu } \right)}}} \right. \kern-\nulldelimiterspace} {\sigma \left( {\mu \mu } \right)}} \leqq 10^{ - 2} \) (90% C.L.) are obtained both for inclusive and exclusive production. For the lifetime of theB-meson (m B =5GeV/c 2) an upper limit τ≦2×10−9s is obtained.
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Partly supported by the Yamada Science Foundation
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JADE-Collaboration., Bartel, W., Canzler, T. et al. Search for fractional charge and heavy stable particles at PETRA. Z. Phys. C - Particles and Fields 6, 295–302 (1980). https://doi.org/10.1007/BF01474803
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DOI: https://doi.org/10.1007/BF01474803