Measurement of radiative neutralino production

TL;DR

This study demonstrates that at a 500 GeV linear collider, radiative neutralino production can be effectively measured with full detector simulation, enabling precise determination of neutralino properties despite background challenges.

Contribution

First experimental simulation showing the feasibility of measuring radiative neutralino production at a linear collider with polarized beams.

Findings

Photon spectrum can be well isolated from background.

Neutralino mass and cross section measurable at a few percent accuracy.

Beam polarization and energy spectrum are key systematic uncertainties.

Abstract

We perform the first experimental study with full detector simulation for the radiative production of neutralinos at the linear collider, at sqrt{s} = 500 GeV and realistic beam polarizations. We consider all relevant backgrounds, like the Standard Model background from radiative neutrino production. The longitudinal polarized beams enhance the signal and simultaneously reduce the background, such that statistical errors are significantly reduced. We find that the photon spectrum from the signal process can be well isolated. The neutralino mass and the cross section can be measured at a few per-cent level, with the largest systematic uncertainties from the measurement of the beam polarization and the beam energy spectrum.