用WHIZARD模拟硬光子产生
Simulating hard photon production with WHIZARD
摘要：
拟议中的未来$e^+e^-$对撞机实验的重要目标之一是使用不同的实验方法寻找暗物质粒子。最一般的搜索方法是基于单光子签名，这是预期的生产时，不可见的最终状态是伴随着一个硬光子从初始状态辐射。对这些光子的能谱和角分布的分析可以揭示暗物质的性质及其相互作用。因此，能够在统一的框架中模拟信号和背景样本以避免可能的系统偏差至关重要。WHIZARD程序是一个灵活的工具，它被$e^+e^-$协作组织广泛用于模拟许多不同的"新物理"场景。我们提出的程序合并的矩阵元计算与轻子ISR结构功能中实现的WHIZARD。它使我们能够可靠地模拟单光子事件，包括两个主要的标准模型背景过程：辐射中微子对的产生和辐射Bhabha散射。我们证明了中微子对产生事件中单光子的截面和运动学分布与KKMC的相应预测一致。KKMC是一个提供SM和QED过程微扰预测的蒙特卡罗发生器，已广泛用于LEP数据的分析。
英文摘要：
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.
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