Abstract
Scalar induced top decays may drastically suppress B(tlν+jet) and still hide the top below MW. The pp¯ collider experiments should enlarge the scope and study the mtB(tlνj) plane. Specific model signatures such as tch0cbb¯ (multiple high pT b jets) and tbH+bcs¯, bτ+ν [with B(tbτν)≲1/3] should be explored. Without ruling out these possibilities, isolated lepton signals in the future might actually be due to the fourth generation t’ or b’ quark, while top quark and toponium physics could still turn up at the CERN e+ e LEP-II collider.
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