Speaker
Description
One of the important goals of the proposed future $e^+e^-$
collider experiments is the search for dark matter particles
using different experimental approaches. The most general search
approach is based on the mono-photon signature, which is expected
when production of the invisible final state is accompanied by a
hard photon from initial state radiation. Analysis of the energy
spectrum and angular distributions of those photons can shed light
on the nature of dark matter and its interactions. Therefore, it
is crucial to be able to simulate the signal and background samples
in a uniform framework, to avoid possible systematic biases. The
WHIZARD program is a flexible tool, which is widely used by
$e^+e^-$ collaborations for simulation of many different "new
physics" scenarios.
We propose the procedure of merging the matrix element calculations
with the lepton ISR structure function implemented in WHIZARD.
It allows us to reliably simulate the mono-photon events, including
the two main Standard Model background processes: radiative neutrino pair
production and radiative Bhabha scattering.
We demonstrate that cross sections and kinematic distributions of
mono-photon in neutrino pair-production events agree with
corresponding predictions of the ${\cal KK}$MC, a Monte Carlo generator
providing perturbative predictions for SM and QED processes,
which has been widely used in the analysis of LEP data.
| Time Zone | Europe/Africa/Middle East |
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