261 research outputs found
Full one-loop corrections to neutralino pair production in e+e- annihilation
We present the full one-loop radiative corrections to pair production of
neutralinos in e+e- collisions within the Minimal Supersymmetric Standard
Model. Particular attention is paid to the definition of weak and QED
corrections. The non-universal QED corrections are extracted by subtracting the
initial state radiation. We give numerical results for two different SUSY
scenarios for e+e- -> neu_1 neu_2 and e+e- -> neu_2 neu_2. The weak and QED
corrections are up to several percent or even higher and need to be taken into
account at future linear collider experiments.Comment: Problem with Mathematica fonts in the figures fixe
Production of Stop, Sbottom, and Stau at LEP2
We present a comprehensive study of pair production and decay of stops,
sbottoms, and staus in annihilation at LEP2. We give numerical
predictions within the Minimal Supersymmetric Standard Model for cross sections
and decay rates, and discuss the important signatures. In the case of stau
production we also study the polarization of the tau in the decays stau_1 ->
tau + neutralino_{1,2}.Comment: 15 pages, LateX, 13 figures appended as uuencoded PS-file. LateX file
and figures are also available via anonymous ftp at
ftp://info.oeaw.ac.at/pub/hephy-pub/64
CP violating angular asymmetries of b and bbar quarks in e+e- -> t tbar
We obtain analytical formulae for the cross section and the angular
distributions of the b(bbar) quarks in the process e+e- -> t tbar, with t -> W+
b (tbar -> W- bbar) assuming CP violation in the \gamma t tbar and Z t tbar
vertices. We present CP violating asymmetries, which measure separately the
real and imaginary parts of the electroweak dipole moment form factors of the
top, d^{\gamma}(s) and d^{Z}(s). We give a numerical analysis of these
asymmetries within the Minimal Supersymmetric Standard Model with complex
parameters. They turn out to be of order <= 10^{-3}.Comment: 22 pages LaTeX with 3x3 figures included; some definitions for
polarization asymmetries and some notations are changed and some references
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