论文标题
在运行2数据中，ATLAS检测器缺失的横向动量触发器的性能
Performance of the missing transverse momentum triggers for the ATLAS detector during Run-2 data taking
论文作者
论文摘要
LHC发光度增加了四个因素，从$ 0.5 \ times 10^{34} \，\ textrm {cm}^{ - 2} \ 2} \ textrm {s}^{ - 1} $ to $ 2.0 \ times \ times 10^{34} \ textrm {cm}^{ - 2} \ textrm {s}^{ - 1} $，以及2015-2018数据摄取期间堆积碰撞的相应增加，对Atlas提出了一个挑战，即Atlas触发缺失的横向动力。固定阈值处的输出数据速率通常会随着堆积冲突的数量而指数级的增加，因此必须调整以前LHC数据研究期的旧算法，并开发出新的方法来维持早期操作中获得的高触发效率。对触发性能和与模拟的比较的研究表明，这些变化导致事件选择效率在此期间> 98％，会议，在某些情况下超过早期运行期间类似触发器的性能，同时将必要的带宽保持在可接受的限制内。
The factor of four increase in the LHC luminosity, from $0.5\times 10^{34}\,\textrm{cm}^{-2}\textrm{s}^{-1}$ to $2.0\times 10^{34}\textrm{cm}^{-2}\textrm{s}^{-1}$, and the corresponding increase in pile-up collisions during the 2015-2018 data-taking period, presented a challenge for ATLAS to trigger on missing transverse momentum. The output data rate at fixed threshold typically increases exponentially with the number of pile-up collisions, so the legacy algorithms from previous LHC data-taking periods had to be tuned and new approaches developed to maintain the high trigger efficiency achieved in earlier operations. A study of the trigger performance and comparisons with simulations show that these changes resulted in event selection efficiencies of >98% for this period, meeting and in some cases exceeding the performance of similar triggers in earlier run periods, while at the same time keeping the necessary bandwidth within acceptable limits.
