ISSN:
1434-6052
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
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.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01474803