The t-channel W exchange interference in e+e- to nu nu-bar gamma at FCC-ee allows the Z-nu_e coupling to be measured with about 1% statistical error, a factor twenty better than current knowledge.
Event generator for the single- and double-photon emission associated with neutrino pair-production
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abstract
A new event generator is proposed for two processes e+e- -> nu nu-bar gamma and e+e- -> nu nu-bar gamma gamma where nu includes all the neutrino species. The exact matrix elements of single- and double-photon emission, generated by the GRACE system, are convoluted with the QED parton shower(QEDPS) to deal with the initial state radiations(ISR). It is pointed out that a careful treatment is required to avoid the double counting of the radiative photons between the matrix elements and the ISR part. A detailed comparison of grc-nu-nu-gamma with the O(alpha) calculations and other similar Monte Carlo generators is discussed on the total cross section and on various distributions. It is also examined how the possible effects of the anomalous triple-gauge-boson couplings can be observed.
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2019 1verdicts
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Precision measurement of the Z boson to electron neutrino coupling at the future circular colliders
The t-channel W exchange interference in e+e- to nu nu-bar gamma at FCC-ee allows the Z-nu_e coupling to be measured with about 1% statistical error, a factor twenty better than current knowledge.