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Polarisation in sfermion decays: determining $\tan\beta$ and trilinear couplings

Authors:	E Boos H-U Martyn G Moortgat-Pick M Sachwitz A Sherstnev P M Zerwas

Institution:	(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

Abstract:	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.Received: 17 April 2003, Revised: 3 July 2003, Published online: 29 August 2003

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