Effects from the charm scale in K+ -> pi+ nu nubar

Abstract

We consider contributions to the rare decay K+ -> pi+ nu nubar which become nonlocal at the charm scale. Compared to the leading term, such amplitudes are suppressed by two powers of mK/mc and could potentially give corrections at the level of 15%. We compute the leading coefficients of the subleading dimension eight operators in the effective theory below the charm mass. The matrix elements of these operators cannot all be calculated from first principles and some must be modeled. We find that these contributions are likely to be small, but the estimate is sufficiently uncertain that the result may be as large as the existing theoretical uncertainty from other sources.

9 pages, 3 figures; Eq. (15) fixed, all results and conclusions unaltered

Cited by in corpus (24)

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• KL -> pi0 nu nu-bar as a Probe of New Physics
• K -> pi nu nubar from standard to new physics
• Constraints on new physics from $K\to \pi \nu \bar{\nu }$
• Rare decays: theory vs. experiments
• Evading the Grossman-Nir bound with $\Delta I=3/2$ new physics
• Kaon decays and the flavour problem
• Kaon mixing and the charm mass
• Quark mixing and CP violation - the CKM matrix
• Estimate of B(K -> pi nu nubar) from Standard Model fits to lambda_t
• Flavor Physics and the CKM Matrix: An Overview