Emulating the impact of additional proton-proton interactions in the ATLAS simulation by presampling sets of inelastic Monte Carlo events
Emulating the impact of additional proton-proton interactions in the ATLAS simulation by presampling sets of inelastic Monte Carlo events
复制标题
通过对非弹性蒙特卡罗事件集进行预采样来模拟 ATLAS 模拟中额外质子-质子相互作用的影响
DOI：
10.1007/s41781-021-00062-2
复制
发表时间：
2022
影响因子：
--
通讯作者：
Aad G
中科院分区：
文献类型：
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作者：
Aad G
为了分析大型强子对撞机产生的质子-质子碰撞，在ATLAS实验中精确模拟附加相互作用对计算资源提出了重大挑战。在LHC运行2（2015-2018）期间，每个束交叉有多达70个非弹性相互作用，这需要在蒙特卡罗（MC）生产中考虑。在本文中，描述了一种新的方法来解释模拟链中这些额外的相互作用。不是对非弹性相互作用进行采样，并将它们的能量沉积逐个添加到硬散射相互作用中，而是对非弹性相互作用进行预采样，独立于硬散射，并作为组合事件存储。因此，对于每个硬散射交互，只需要添加一个这样的预采样事件作为模拟链的一部分。对于Run 2模拟链，平均每束交叉有35个相互作用，这种新方法可以将MC生产CPU需求大幅降低约20%，同时以良好的精度再现与物理分析相关的重构量的属性。
The accurate simulation of additional interactions at the ATLAS experiment for the analysis of proton–proton collisions delivered by the Large Hadron Collider presents a significant challenge to the computing resources. During the LHC Run 2 (2015–2018), there were up to 70 inelastic interactions per bunch crossing, which need to be accounted for in Monte Carlo (MC) production. In this document, a new method to account for these additional interactions in the simulation chain is described. Instead of sampling the inelastic interactions and adding their energy deposits to a hard-scatter interaction one-by-one, the inelastic interactions are presampled, independent of the hard scatter, and stored as combined events. Consequently, for each hard-scatter interaction, only one such presampled event needs to be added as part of the simulation chain. For the Run 2 simulation chain, with an average of 35 interactions per bunch crossing, this new method provides a substantial reduction in MC production CPU needs of around 20%, while reproducing the properties of the reconstructed quantities relevant for physics analyses with good accuracy.