Performance of the missing transverse momentum triggers for the ATLAS detector during Run-2 data taking
Performance of the missing transverse momentum triggers for the ATLAS detector during Run-2 data taking
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DOI：
10.1007/jhep08(2020)080
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发表时间：
2020-05
影响因子：
5.4
通讯作者：
G. Aad;A. Kupco;T. Dreyer;Yufeng Wang;K. Jakobs;B. Le;M. Spousta;M. Cobal;Peilong Wang
中科院分区：
文献类型：
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作者：
G. Aad;A. Kupco;T. Dreyer;Yufeng Wang;K. Jakobs;B. Le;M. Spousta;M. Cobal;Peilong Wang
LHC的亮度从0增加到4倍。5× 10 34 cm−2 s−1 ~ 2。0× 10 34 cm−2 s−1，以及在2015-2018年数据采集期间相应增加的堆积碰撞，对ATLAS触发器提出了挑战，特别是对于那些选择缺少横向动量的事件的算法。固定阈值下的输出数据速率通常随着堆积碰撞次数呈指数增长，因此必须对以前LHC数据采集周期的遗留算法进行调整，并开发新的方法来保持早期操作中实现的高触发效率。对触发器性能的研究以及与仿真的比较表明，这些变化导致这一时间段的事件选择效率达到了98%，达到甚至在某些情况下超过了早期运行周期的类似触发器的性能，同时将必要的带宽保持在可接受的范围内。
The factor of four increase in the LHC luminosity, from 0. 5× 10 34 cm− 2 s− 1 to 2. 0× 10 34 cm− 2 s− 1, and the corresponding increase in pile-up collisions during the 2015–2018 data-taking period, presented a challenge for the ATLAS trigger, particularly for those algorithms that select events with 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.