3 research outputs found
The Complete |Delta S|=2 Hamiltonian in the Next-To-Leading Order
We present the complete next-to-leading order short-distance QCD corrections
to the effective \dstwo -hamiltonian in the Standard Model. The calculation of
the coefficient is described in great detail. It involves the two-loop
mixing of bilocal structures composed of two \dsone\ operators into \dstwo\
operators. The next-to-leading order corrections enhance by 27\% to
\eta_3=0.47 \errorpm{+0.03}{-0.04} thereby affecting the phenomenology of
sizeably. depends on the physical input parameters ,
and \laMSb only weakly. The quoted error stems from renormalization
scale dependences, which have reduced compared to the old leading log result.
The known calculation of and is repeated in order to compare
the structure of the three QCD coefficients. We further discuss some field
theoretical aspects of the calculation such as the renormalization group
equation for Green's functions with two operator insertions and the
renormalization scheme dependence caused by the presence of evanescent
operators.Comment: 68 pages, requires LaTeX2e and the standard LaTeX-packages epsf.sty,
rotate.sty, a4.sty, subeqn.sty, cite.sty, array.sty, dcolumn.sty; Figures are
submitted as a seperate tar.gz-file. A complete PostScript version may be
obtained from
ftp://feynman.t30.physik.tu-muenchen.de/pub/preprints/tum-86-96.ps.gz or
ftp://feynman.t30.physik.tu-muenchen.de/pub/preprints/tum-86-96.ps2.gz
(scaled down and rotated version to print two pages on one sheet of paper).
Source available at
ftp://feynman.t30.physik.tu-muenchen.de/pub/preprints/tum-86-96.tar.g