Triple-real contribution to the quark beam function in QCD at next-to-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 کاملTop-quark decay at next-to-next-to-leading order in QCD.
We present the complete calculation of the top-quark decay width at next-to-next-to-leading order in QCD, including next-to-leading electroweak corrections as well as finite bottom quark mass and W boson width effects. In particular, we also show the first results of the fully differential decay rates for the top-quark semileptonic decay t → W(+)(l(+)ν)b at next-to-next-to-leading order in QCD....
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 کاملThe Rare Decay K + → π + νν̄ at the Next - to - Next - to - Leading Order in QCD
We calculate the complete next-to-next-to-leading order QCD correction of the charm quark contribution to the branching ratio for the rare decay K + → π + ν ¯ ν in the standard model. The inclusion of these O(αs) contributions leads to a significant reduction of the theoretical uncertainty from ±10.1% down to ±2.4% in the relevant parameter Pc, implying the left over scale uncertainties in B(K ...
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: Journal of High Energy Physics
سال: 2019
ISSN: 1029-8479
DOI: 10.1007/jhep06(2019)033