Freiburg 2008 – scientific programme
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T: Fachverband Teilchenphysik
T 15: Beyond the Standard Model (Theorie) I
T 15.10: Talk
Monday, March 3, 2008, 19:00–19:15, KGI-HS 1021
Tau polarisation as sensitive probe for CP violation in chargino production at the ILC — •Anja Marold — Physikalisches Institut der Universität Bonn
The Minimal Supersymmetric Standard Model offers additional sources for CP-violating phases. In the chargino sector, this is the phase of the Higgsino mass parameter µ.
We study chargino production e+e−→χi+χj− with longitudinally polarised beams and the ensuing two-body decay of one of the charginos into a tau χi+→τ+ντ. We show that the transverse tau polarisation is highly sensitive to the phase of µ and define CP-asymmetries which probe the transverse tau-polarisation.
We present numerical results of the asymmetries which can be as large as 60% and discuss the importance of initial beam polarisations.