Abstract
The rare decays play a central role in testing the standard model and its extensions. Upcoming experiments plan to measure the decay rates with high accuracy. Yet, unknown higher-order electroweak corrections result in a sizeable theory error. We remove this uncertainty by computing the full two-loop electroweak corrections to the top-quark contribution to the rare decays , , and in the standard model. The remaining theoretical uncertainty related to electroweak effects is now far below 1%. Finally we update the branching ratios to find and . The first error summarizes the parametric, the second the remaining theoretical uncertainties.
- Received 8 November 2010
DOI:https://doi.org/10.1103/PhysRevD.83.034030
© 2011 American Physical Society
Viewpoint
Clues from a rare decay
Published 22 February 2011
An ideal place to look for new physics beyond the standard model is a rare particle decay, and new calculations are providing a highly accurate picture of what to expect.
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