利用 ATLAS 实验寻找希格斯玻色子衰变为魅夸克。

Search for the Decay of the Higgs Boson to Charm Quarks with the ATLAS Experiment.

机构信息

Faculté des Sciences, Université Mohamed Premier and LPTPM, Oujda, Morocco.

CPPM, Aix-Marseille Université and CNRS/IN2P3, Marseille, France.

出版信息

Phys Rev Lett. 2018 May 25;120(21):211802. doi: 10.1103/PhysRevLett.120.211802.

DOI:10.1103/PhysRevLett.120.211802

PMID:29883151

Abstract

A direct search for the standard model Higgs boson decaying to a pair of charm quarks is presented. Associated production of the Higgs and Z bosons, in the decay mode ZH→ℓ^{+}ℓ^{-}cc[over ¯] is studied. A data set with an integrated luminosity of 36.1 fb^{-1} of pp collisions at sqrt[s]=13TeV recorded by the ATLAS experiment at the LHC is used. The H→cc[over ¯] signature is identified using charm-tagging algorithms. The observed (expected) upper limit on σ(pp→ZH)×B(H→cc[over ¯]) is 2.7 (3.9_{-1.1}^{+2.1}) pb at the 95% confidence level for a Higgs boson mass of 125 GeV, while the standard model value is 26 fb.

摘要

呈现了一种直接搜索标准模型希格斯玻色子衰变为一对粲夸克的方法。研究了希格斯和 Z 玻色子的伴随产生，其衰变模式为 ZH→ℓ^{+}ℓ^{-}cc[over ¯]。利用 ATLAS 实验在 LHC 上记录的 sqrt[s]=13TeV pp 碰撞的 36.1 fb^{-1}积分亮度数据集。使用了一种利用粲夸克标记算法识别 H→cc[over ¯]特征的方法。在希格斯玻色子质量为 125GeV 时，观测到（预期）的 σ(pp→ZH)×B(H→cc[over ¯]) 的 95%置信水平上限为 2.7（3.9_{-1.1}^{+2.1}）pb，而标准模型值为 26fb。