Normal tau polarisation as a sensitive probe of CP violation in chargino decay

Details Normal tau polarisation as a sensitive probe of CP violation in chargino decay Normal tau polarisation as a sensitive probe of CP violation in chargino decay

2010-01-26

arxiv.org/abs/1001.4714v1

Phys.Rev.D82:116005,2010

Physics

High Energy Physics

High Energy Physics - Phenomenology

20 pages, 10 figures, gzipped tar file

Scientific paper

10.1103/PhysRevD.82.116005

CP violation in the spin-spin correlations in chargino production and subsequent two-body decay into a tau and a tau-sneutrino is studied at the ILC. From the normal polarisation of the tau, an asymmetry is defined to test the CP-violating phase of the higgsino mass parameter \mu. Asymmetries of more than \pm70% are obtained, also in scenarios with heavy first and second generation sfermions. Bounds on the statistical significances of the CP asymmetries are estimated. As a result, the normal tau polarisation in the chargino decay is one of the most sensitive probes to constrain or measure the phase \phi_\mu at the ILC, motivating further detailed experimental studies.

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