Abstract
A sequential fourth generation is still viable, but the and quarks are constrained not to be too far apart in mass. The and decay channels are still being pursued at the Tevatron, which will soon be surpassed by the LHC. We use a convolution method with up to five-body final states to study and decays. We show how the two decay branches for below the threshold, and , merge with above the threshold. We then consider the heavy-to-heavy transitions (or ), as they are not suppressed by quark mixing. We find that, because of the threshold sensitivity of the branching fraction of (or ), it is possible to measure the strength of the CKM mixing element (or ), especially when it is rather small. We urge experimenters to pursue and separate the (or ) decay in their search programs.
- Received 30 December 2010
DOI:https://doi.org/10.1103/PhysRevD.84.014029
© 2011 American Physical Society