The proposed e+e−-collider FCC-ee aims at an unprecedented accuracy for e+e− collisions into fermion pairs at the Z peak, based on about 1013 events. The S-matrix approach to the Z boson line shape allows the model-independent quantitative description of the reaction e+e−→fˉf around the Z peak in terms of few parameters, among them the mass MZ and width ΓZ of the Z-boson. While weak and strong corrections remain "black", a careful theoretical description of the photonic interactions is mandatory. I introduce the method and describe applications and the analysis tool SMATASY/ZFITTER.
@article{arxiv.1610.04501,
title = {S-matrix approach to the Z resonance},
author = {T. Riemann},
journal= {arXiv preprint arXiv:1610.04501},
year = {2016}
}
Comments
10 pages, Proceedings of 39th International Conference of Theoretical Physics: Matter to the Deepest, Recent Developments in Physics of Fundamental Interactions, 13-18 September 2015, Ustron, Poland; presented also at the FCC-ee meeting, February 2015, Pisa; at CALC, July 2015, JINR, Dubna; at HEPKIT, October 2015, KIT, Karlsruhe. Note added on 14 October 2016