Measuring tau-polarisation in Neutralino2 decays at the LHC

Details Measuring tau-polarisation in Neutralino2 decays at the LHC Measuring tau-polarisation in Neutralino2 decays at the LHC

2009-03-04

arxiv.org/abs/0903.0714v2

Physics

High Energy Physics

High Energy Physics - Phenomenology

16 pages, 9 figures, minor changes

Scientific paper

We show how the sum of the two average tau polarisations in the decay chain chi20 -> stau1 tau -> tau tau chi10 in minimal supersymmetry with conserved R-parity can be measured at the LHC. This is accomplished by exploiting the polarisation dependence of the visible di-tau mass spectrum. Such a measurement provides information on the couplings of the involved SUSY particles and allows a more precise determination of the di-tau mass endpoint. If different tau decay modes can be distinguished, the polarisation and endpoint measurement can be improved even further.

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