Measurement of the Soft-Drop Jet Mass in pp Collisions at √s=13 TeV with the ATLAS Detector
Measurement of the Soft-Drop Jet Mass in pp Collisions at √s=13 TeV with the ATLAS Detector
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DOI：
10.1103/physrevlett.121.092001
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发表时间：
2018-08-28
影响因子：
8.6
通讯作者：
Zwalinski, L.
中科院分区：
文献类型：
--
作者：
Aaboud, M.;Aad, G.;Zwalinski, L.
喷流子结构观测值大大扩展了大型强子对撞机标准模型之外的物理搜索程序。国家的最先进的工具已被理论计算的动机，但从来没有一个直接比较的数据和计算的射流子结构观测值是准确的领先对数近似。这些观测值不仅对探测强子对撞机上尚未探测到的QCD共线区域有重要意义，而且对提高大型强子对撞机上许多研究中使用的喷流子结构性质的理解也有重要意义。这封信记录了强子对撞机上第一个喷流子结构数量的测量，并以次-次-首对数精度进行计算。标准化的微分横截面作为log（10）rho（2）的函数进行测量，其中rho是软液滴质量与未修饰射流横向动量的比值。这个量是在由ATLAS探测器记录的根s = 13 TeV的质子-质子碰撞的32.9 fb（-1）的双射流事件中测量的。展开的数据，以纠正检测器的影响，并进行比较，精确的QCD计算和领先的对数粒子级蒙特卡罗模拟。
Jet substructure observables have significantly extended the search program for physics beyond the standard model at the Large Hadron Collider. The state-of-the-art tools have been motivated by theoretical calculations, but there has never been a direct comparison between data and calculations of jet substructure observables that are accurate beyond leading-logarithm approximation. Such observables are significant not only for probing the collinear regime of QCD that is largely unexplored at a hadron collider, but also for improving the understanding of jet substructure properties that are used in many studies at the Large Hadron Collider. This Letter documents a measurement of the first jet substructure quantity at a hadron collider to be calculated at next-to-next-to-leading-logarithm accuracy. The normalized, differential cross section is measured as a function of log(10)rho(2), where rho is the ratio of the soft-drop mass to the ungroomed jet transverse momentum. This quantity is measured in dijet events from 32.9 fb(-1) of root s = 13 TeV proton-proton collisions recorded by the ATLAS detector. The data are unfolded to correct for detector effects and compared to precise QCD calculations and leading-logarithm particle-level Monte Carlo simulations.