Electroweak Corrections to the Charm Quark Contribution to K+ ---> pi+ nu anti-nu

May, 2008
16 pages
Published in:
  • Phys.Rev.D 78 (2008) 034006
e-Print:
Report number:
  • TTP08-09,
  • SFB-CPP-08-30

Citations per year

200120072013201920240102030
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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