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Patrick Janot renamed Measurement of the Z invisible width from runs at E> M_Z.tex to Measurement of the Z invisible width from runs at E greater than M_Z.tex
almost 11 years ago
Commit id: 88f54e18e7596d49df3d0ec1d277d00037cadab8
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\subsection{Measurement of the Z invisible with from Z$\gamma$ events}
In the same way as the ZH process provides a beam of tagged Higgs bosons, the Z$\gamma$ process with a tag on the high energy photon provides a tagged beam of Z bosons. From all data taken above the Z peak a large sample of Z+$\gamma$ events will be collected. 5 million such events will be expected in each experiment with an invisible Z decay. The normalization could be done on hadronic Z decays or on leptonic Z decays, providing a cross--check of the systematics and backgrounds related to the selection of the photon and to the background. Errors associated with absolute luminosity cancel in this ratio measurement, as well as most QED uncertainties related to the energy and angular distribution of the tagged photon. The invisible Z width will thus be measured with a statistical error corresponding to 0.001 neutrino family. Systematics are expected to be at the same level or smaller.
