Charm-Quark Contribution toKL→μ+μ−at Next-to-Next-to-Leading Order
نویسندگان
چکیده
منابع مشابه
Charm Quark Contribution to K → πνν̄ at Next-to-Next-to-Leading Order
We calculate the complete next-to-next-to-leading order QCD corrections to the charm contribution of the rare decay K → πνν̄. We encounter several new features, which were absent in lower orders. We discuss them in detail and present the results for the twoloop matching conditions of the Wilson coefficients, the three-loop anomalous dimensions, and the two-loop matrix elements of the relevant op...
متن کاملCharm Quark Contribution to K L → μ + μ − at Next - to - Next - to - Leading Order
We calculate the charm quark contribution to the decay KL → μ μ in next-to-next-to-leading order of QCD. This new contribution reduces the theoretical uncertainty in the relevant parameter Pc from ±22% down to±7%, corresponding to scale uncertainties of±3% and ±6% in the short-distance part of the branching ratio and the determination of the Wolfenstein parameter ρ̄ from KL → μ μ. The error in P...
متن کاملThreshold corrections in bottom and charm quark hadroproduction at next-to-next-to-leading order
We calculate threshold soft-gluon corrections to total cross sections and transverse momentum distributions for bottom and charm quark production in fixed-target experiments, considering both pp and π−p interactions. We investigate the quality of the near threshold soft-gluon approximation at next-to-leading order (NLO) and calculate next-to-nextto-leading order (NNLO) corrections through next-...
متن کاملTransverse parton distribution functions at next-to-next-to-leading order: the quark-to-quark case.
We present a calculation of the perturbative quark-to-quark transverse parton distribution function at next-to-next-to-leading order based on a gauge invariant operator definition. We demonstrate for the first time that such a definition works beyond the first nontrivial order. We extract from our calculation the coefficient functions relevant for a next-to-next-to-next-to-leading logarithmic Q...
متن کاملHadronic contribution to the muon anomalous magnetic moment to next-to-next-to-leading order
We compute the next-to-next-to-leading order hadronic contribution to the muon anomalous magnetic moment originating from the photon vacuum polarization. The corresponding three-loop kernel functions are calculated using asymptotic expansion techniques which lead to analytic expressions. Our final result, a μ = 1.24± 0.01 × 10−10, has the same order of magnitude as the current uncertainty of th...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Physical Review Letters
سال: 2006
ISSN: 0031-9007,1079-7114
DOI: 10.1103/physrevlett.97.122002