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arXiv 2407.20127hep-ex
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使用ATLAS探测器的增强型顶夸克标记中的准确度与精密度

Accuracy versus precision in boosted top tagging with the ATLAS detector

ATLAS Collaboration

AI总结:

本研究针对ATLAS探测器下基于机器学习的顶夸克标记算法,评估其性能与系统不确定度,发现性能最优算法不确定度最大,并公开数据集以推动相关方法开发。

摘要:

顶夸克衰变的识别(即顶夸克具有相对于束流轴的大横动量,被称为$top$ $tagging$(顶夸克标记)),是大型强子对撞机上众多标准模型过程测量以及超出标准模型物理搜寻的关键组成部分。机器学习技术已提升了顶夸克标记算法的性能,但所有已提出算法的系统不确定度大小尚未得到系统研究。本文展示了多种基于机器学习的顶夸克标记算法在一个数据集上的性能,该数据集由ATLAS探测器在质心系能量$\boldsymbol{\bigstar} = 13$ TeV下测得的模拟质子-质子碰撞事件构建而成。与这些算法相关的系统不确定度通过一种近似流程估算,该流程并非用于物理分析,但适用于本研究所需的精度水平。研究发现性能最优的算法具有最大的不确定度,这推动了在不损害性能的前提下降低这些不确定度的方法的开发。为了让更广泛的科学界能够开展此类工作,本文使用的数据集已公开。

英文摘要:

The identification of top quark decays where the top quark has a large momentum transverse to the beam axis, known as $top$ $tagging$, is a crucial component in many measurements of Standard Model processes and searches for beyond the Standard Model physics at the Large Hadron Collider. Machine learning techniques have improved the performance of top tagging algorithms, but the size of the systematic uncertainties for all proposed algorithms has not been systematically studied. This paper presents the performance of several machine learning based top tagging algorithms on a dataset constructed from simulated proton-proton collision events measured with the ATLAS detector at $\sqrt{s} = 13$ TeV. The systematic uncertainties associated with these algorithms are estimated through an approximate procedure that is not meant to be used in a physics analysis, but is appropriate for the level of precision required for this study. The most performant algorithms are found to have the largest uncertainties, motivating the development of methods to reduce these uncertainties without compromising performance. To enable such efforts in the wider scientific community, the datasets used in this paper are made publicly available.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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