https://doi.org/10.1140/epjc/s2003-01288-y
theoretical physics
Polarisation in sfermion decays: determining $\tan\beta$ and trilinear couplings
1
Skobeltsyn Institute of Nuclear Physics, Moscow State University, 119992, Moscow, Russia
2
DESY, Deutsches Elektronen-Synchrotron, 22603, Hamburg, Germany
3
Rheinisch-Westfälische Technische Hochschule, 52074, Aachen, Germany
4
IPPP, University of Durham, DH1 3LE, Durham, UK
5
DESY, Deutsches Elektronen-Synchrotron, 15738, Zeuthen, Germany
The basic parameters of supersymmetric theories can be determined at future e + e - linear colliders with high precision. We investigate in this report how polarisation measurements in $\tilde{\tau}$ and $\tilde{t}$ or $\tilde{b}$ decays to $\tau$ leptons and t quarks plus neutralinos or charginos can be used to measure $\tan\beta$ (in particular for large values) and to determine the trilinear couplings $A_{\tau}$, A t and A b in sfermion pair production.
© Springer-Verlag, 2003