Simulating hard photon production with WHIZARD

Abstract

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 KKMC, a Monte Carlo generator providing perturbative predictions for SM and QED processes, which has been widely used in the analysis of LEP data.

17 pages, 8 figures, 6 tables, 2 example steering files

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Cited by in corpus (12)

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• Effective Leptophilic WIMPs at the $e^{+}{e}^{-}$ collider
• Dark Matter Phenomenology in 2HDMS in light of the 95 GeV excess
• Sensitivity of future linear $e^{+}{e}^{-}$ colliders to processes of dark matter production with light mediator exchange
• EFT analysis of leptophilic dark matter at future electron-positron colliders in the mono-photon and mono-$Z$ channels
• Leptophilic $Z^{\prime }$ bosons at the FCC-ee: discovery opportunities
• Search for invisible dark photon in $\gamma e$ scattering at future lepton colliders
• Determination of the first-generation quark couplings at the Z-pole
• Monte Carlo Event Generators
• Searches for the leptophilic Z' boson at the International Linear Collider and Linear Collider Facility
• Challenges for Monte Carlo generators