Sparticle Production in Electron-Photon Collisions
Abstract
We explore the potential of electron-photon colliders to measure fundamental supersymmetry parameters via the processes
eγ→
e
~
χ
~
0
(selectron-neutralino) and
eγ→
ν
~
χ
~
−
(sneutrino-chargino). Given the
χ
~
0
and
χ
~
−
masses from
e
+
e
−
and hadron collider studies, cross section ratios
σ(
γ
−
)/σ(
γ
+
)
for opposite photon helicities determine the
ν
~
L
,
e
~
L
and
e
~
R
masses, independent of the sparticle branching fractions. The difference
m
2
ν
~
L
−
m
2
e
~
L
measures
M
2
W
cos2β
in a model-independent way. The
e
~
L
and
e
~
R
masses test the universality of soft supersymmetry breaking scalar masses. The cross section normalizations provide information about the gaugino mixing parameters.