no way to compare when less than two revisions
Differences
This shows you the differences between two versions of the page.
— | preprints:2006:ttp06-06 [2016/03/17 11:03] (current) – created - external edit 127.0.0.1 | ||
---|---|---|---|
Line 1: | Line 1: | ||
+ | ====== TTP06-06 Charm Quark Contribution to K^+ -> pi^+ nu anti-nu at Next-to-Next-to-Leading Order ====== | ||
+ | |||
+ | |||
+ | < | ||
+ | | ||
+ | | ||
+ | | ||
+ | and the 2-loop matrix elements of the relevant operators that enter the | ||
+ | NNLO renormalization group analysis of the Z-penguin and the electroweak | ||
+ | box contribution. The inclusion of the NNLO QCD corrections leads to a | ||
+ | | ||
+ | 2.4% in the relevant parameter Pc, implying the leftover scale | ||
+ | | ||
+ | | ||
+ | 1.0%, 0.006, and 1.2 degrees, respectively. For the charm quark MSbar | ||
+ | mass mc=(1.30+-0.05) GeV and |V_us|= 0.2248 the NLO value Pc=0.37+-0.06 | ||
+ | is modified to Pc=0.38+-0.04 at the NNLO level with the latter error | ||
+ | fully dominated by the uncertainty in mc. We present tables for Pc as a | ||
+ | | ||
+ | | ||
+ | | ||
+ | | ||
+ | | ||
+ | being the dominant individual sources in the quoted error. We also | ||
+ | | ||
+ | to K+ -> pi+ nu nu-bar and of the isospin breaking corrections in the | ||
+ | | ||
+ | would be valuable in order to increase the potential of the two golden K | ||
+ | -> pi nu nu decays in the search for new physics. | ||
+ | </ | ||
+ | |**Andrzej J. Buras, Martin Gorbahn, Ulrich Haisch, Ulrich Nierste** | ||
+ | |** JHEP 0611 002 2006 ** | | ||
+ | | {{preprints: | ||
+ | | | |