Constraints on Couplings of Extra Gauge Bosons from e+e- --> nu nubar gamma

TL;DR

This paper discusses how measurements of the process e+e- --> nu nubar gamma at future colliders can constrain the couplings of hypothetical extra gauge bosons, emphasizing the importance of precise cross section and asymmetry measurements.

Contribution

It introduces a method to derive coupling constraints of extra gauge bosons using e+e- collision data, highlighting the role of polarization asymmetries and systematic error control.

Findings

Total cross section and polarization asymmetries are highly sensitive to extra gauge boson couplings.

Precise measurements with low systematic errors are essential for meaningful constraints.

The approach can help distinguish between different models of new physics involving extra gauge bosons.

Abstract

If extra gauge bosons are observed at the LHC or at a linear e+e- collider, the reaction e+e- --> nu nubar gamma can give information on the couplings (W' nu l) and (Z' nu nubar). The total cross section and polarization asymmetries are the most sensitive observables for such a measurement. Small systematic errors are crucial to obtain reasonable coupling constraints, especially for a high luminosity collider.