349 research outputs found
The non-singlet kaon fragmentation function from e^+e^- kaon production
We perform fits to the available charged and neutral kaon production data in
, , and determine the non-singlet
combination of kaon fragmentation functions in a
model independent way and without any correlations to the other fragmentation
functions. Only nuclear isospin invariance is assumed. Working with
non-singlets allows us to include the data at very low momentum fractions,
which have so far been excluded in global fits, and to perform a first NNLO fit
to fragmentation functions. We find that the kaon non-singlet fragmentation
function at large is larger than that obtained by the other collaborations
from global fit analysis and differs significantly at low
CP violation in charged Higgs decays in the MSSM
In the MSSM with complex parameters loop corrections to the decays and with and lead to
CP-violating asymmetries: a decay rate asymmetry, a forward-backward asymmetry
and an energy asymmetry. We derive explicit formulas for them and perform a
detailed numerical analysis. We study the dependence on the parameters and the
phases involved. In particular, the influence of the running Yukawa coupling is
taken into account. The decay rate asymmetry can go up to 25%, the
forward-backward and the energy asymmetry up to 10%.Comment: 18 pages, 13 postscript figures, JHEP style, Feynman graphs replaced,
one reference adde
- β¦