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An amplitude of 2-body process as shown in Fig.6 is produced by the
GRACE system. Following decays of;
are treated as isotropic decays ignoring any spin information of
gauginos and a vector boson.
This approximation has two aspects;
- Narrow width approximation: Virtuality of any intermediate
particles are ignored. Widths of and
are very small, then this is good approximation.
However the width of W boson
is large compared with a Q-value of
A virtuality of W-boson must affect distributions.
- Ignoring polarization of intermediate particles:
In addition to a deviation in a total cross section, distributions
are distorted by this approximation as shown in Figs.7-8.
1998年07月06日 (月) 12時50分17秒 JST