Müller D, Clemencic M, Corti G, Gersabeck M
1European Organization for Nuclear Research (CERN), Geneva, Switzerland.
2School of Physics and Astronomy, University of Manchester, Manchester, UK.
Eur Phys J C Part Fields. 2018;78(12):1009. doi: 10.1140/epjc/s10052-018-6469-6. Epub 2018 Dec 12.
With the steady increase in the precision of flavour physics measurements collected during LHC Run 2, the LHCb experiment requires simulated data samples of larger and larger sizes to study the detector response in detail. The simulation of the detector response is the main contribution to the time needed to simulate full events. This time scales linearly with the particle multiplicity. Of the dozens of particles present in the simulation only the few participating in the signal decay under study are of interest, while all remaining particles mainly affect the resolutions and efficiencies of the detector. This paper presents a novel development for the LHCb simulation software which re-uses the rest of the event from previously simulated events. This approach achieves an order of magnitude increase in speed and the same quality compared to the nominal simulation.
随着大型强子对撞机（LHC）运行2期间收集的味物理测量精度稳步提高，LHCb实验需要越来越大尺寸的模拟数据样本，以便详细研究探测器响应。探测器响应的模拟是模拟完整事件所需时间的主要组成部分。这段时间与粒子多重性呈线性比例关系。在模拟中存在的几十种粒子中，只有少数参与正在研究的信号衰变的粒子是有意义的，而所有其余粒子主要影响探测器的分辨率和效率。本文介绍了LHCb模拟软件的一项新进展，该软件重新利用先前模拟事件中的其余事件。与标称模拟相比，这种方法实现了速度提高一个数量级且质量相同。
