Quark-gluon tagging with shower deconstruction: Unearthing dark matter and Higgs couplings
Quark-gluon tagging with shower deconstruction: Unearthing dark matter and Higgs couplings
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DOI：
10.1103/physrevd.95.034001
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发表时间：
2017-02-01
影响因子：
5
通讯作者：
Spannowsky, Michael
中科院分区：
文献类型：
--
作者：
de Lima, Danilo Ferreira;Petrov, Petar;Spannowsky, Michael
夸克和胶子引发的喷流的分离可能是提高寻找新物理或测量希格斯玻色子性质的灵敏度的重要方法。我们提出了簇射解构方法的简化版本，作为夸克-胶子标记的新颖可观测值。假设顶簇状物体作为输入，我们将可观测值与能量相关函数进行比较，并发现对于各种射流定义都有良好的性能。我们解决了夸克-胶子辨别的红外敏感性问题。当这种方法应用于单射流最终状态的暗物质搜索时，可以克服小信号背景比的限制。我们还表明，夸克-胶子标记是在 p + p -> H + jet + jet + X 过程中将弱玻色子与胶子聚变产生分离的另一种方法。
The separation of quark and gluon initiated jets can be an important way to improve the sensitivity in searches for new physics or in measurements of Higgs boson properties. We present a simplified version of the shower deconstruction approach as a novel observable for quark-gluon tagging. Assuming top-oclusterlike objects as input, we compare our observable with energy correlation functions and find a favorable performance for a large variety of jet definitions. We address the issue of infrared sensitivity of quark-gluon discrimination. When this approach is applied to dark matter searches in monojet final states, limitations from small signal-to-background ratios can be overcome. We also show that quark-gluon tagging is an alternative way of separating weak boson from gluon-fusion production in the process p + p -> H + jet + jet + X.