Abstract
The precise determination of the Cabibbo-Kobayashi-Maskawa elements and is crucial for any new physics analysis in the flavor sector. Their values can be determined from several tree-level decays: can be extracted from and while can be obtained from , , and . In addition, for both and an inclusive determination is available. There is a long lasting discrepancy between the inclusive and exclusive determinations which recently even increased for above the level. In this Letter we study the possible effect of new physics on the inclusive and exclusive determination of and in a model independent way. We find that there is only one operator corresponding to a modified coupling which can achieve this. However, respecting gauge invariance at the high scale this would lead to very large violations of the to coupling not compatible with experiment. Therefore, we conclude that a new physics explanation of the difference between the inclusive and exclusive determination of and is currently ruled out. Therefore, the discrepancies must be due to underestimated uncertainties in the theoretical and/or the experimental analysis.
- Received 19 July 2014
DOI:https://doi.org/10.1103/PhysRevLett.114.011802
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