Electroweak Corrections to the Charm Quark Contribution to K+ ---> pi+ nu anti-nu
May, 200816 pages
Published in:
- Phys.Rev.D 78 (2008) 034006
e-Print:
- 0805.4119 [hep-ph]
Report number:
- TTP08-09,
- SFB-CPP-08-30
View in:
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Abstract: (arXiv)
We compute the leading-log QED, the next-to-leading-log QED-QCD, and the electroweak corrections to the charm quark contribution relevant for the rare decay K+ -> pi+ nu nu-bar. The corresponding parameter P_c(X) is increased by up to 2% with respect to the pure QCD estimate to P_c(X) = 0.372 +- 0.015 for m_c(m_c)= (1.286 +- 0.013) GeV, alphas(M_Z) = 0.1176 +- 0.0020 and |V_us| = 0.2255. For the branching ratio we find B(K+ -> pi+ nu nu-bar) = (8.5 +- 0.7)*10^{-11}, where the quoted uncertainty is dominated by the CKM elements.- 12.15.Hh
- 12.15.Lk
- 13.20.Eb
- K+: rare decay
- K+: semileptonic decay
- K+: branching ratio
- quantum electrodynamics
- quantum chromodynamics
- leading logarithm approximation: higher-order
- Feynman graph: higher-order
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