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Rare decay K+ →π+ ν ν̄ at the next-to-next-to-leading order m QCD
- Publication Year :
- 2016
-
Abstract
- We calculate the charm quark contribution to the rare decay K+ →π+ ν ν̄ in the next-to-next-to-leading order of QCD. This new contribution reduces the theoretical uncertainty in the relevant parameter P c from ± 10.1% down to ± 2.4%, corresponding to scale uncertainties of ± 1.3%, ± 1.0%, ± 0.006, and ± 1.2° in B (K+ →π+ ν ν̄ and in |Vtd|, sin2β extracted from the K →π+ ν ν̄ system. The error Pc0. 37±0.04 is now fully dominated by the current uncertainty of ±3.8% in the charm quark mass mc. We find B (K+ →π+ ν ν̄)=(8.0±1.1)×10-11, where the quoted error stems almost entirely from the present uncertainties in mc and the Cabibbo-Kobayashi-Maskawa elements. © 2005 The American Physical Society.
Details
- Language :
- English
- Database :
- OpenAIRE
- Accession number :
- edsair.dedup.wf.001..80a047b45f21ea8c531f4d38c3b560e1