Measurement of R and search for new quark flavors decaying into multi-jet final states in e +e - collisions between 54.0 and 61.4 GeV CM energies
Abstract
We accumulated e +e - annihilations into multi-hadrons at CM energies between 54.0 and 61.4 GeV with the VENUS detector at TRISTAN. Measured R-ratios are consistent with the standard model using the Z-boson mass; 91.1 GeV/ c2. Using two new observables, we searched for a planar four-jet and other multi-jet events resulting from the decay of a charge - {1}/{3}e b' quark. Having observed no positive signals, we excluded b' masses between 19.4 and 28.2 GeV/ c2 with a 95% confidence level, regardless of branching into charged current and loop-induced flavor-changing neutral current decay, including a possible Higgs decay process. The charge + {2}/{3}e top quark was excluded below f30.2 GeV/ c2.
- Publication:
-
Physics Letters B
- Pub Date:
- January 1990
- DOI:
- 10.1016/0370-2693(90)91946-9
- Bibcode:
- 1990PhLB..234..382A