Search for Heavy Higgs Bosons A/H Decaying to a Top Quark Pair in pp Collisions at sqrt[s]=8 TeV with the ATLAS Detector.
Search for Heavy Higgs Bosons A/H Decaying to a Top Quark Pair in pp Collisions at sqrt[s]=8 TeV with the ATLAS Detector.
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DOI：
10.1103/physrevlett.119.191803
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发表时间：
2017-11
影响因子：
8.6
通讯作者：
M. Aaboud;G. Aad;B. Abbott;O. Abdinov;B. Abeloos;S. H. Abidi;O. AbouZeid;N. Abraham;
中科院分区：
文献类型：
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作者：
M. Aaboud;G. Aad;B. Abbott;O. Abdinov;B. Abeloos;S. H. Abidi;O. AbouZeid;N. Abraham;
利用大型强子对撞机ATLAS实验收集的20.3 fb^{-1}的质子-质子碰撞数据，在质心能量sqrt[s]=8 TeV的条件下，对衰变为顶夸克对（tt[over <$]）的重赝标（A）和标量（H）希格斯玻色子进行了研究.考虑了信号处理和标准模型tt[over]生产之间的干扰效应，这些干扰效应预计会使信号形状从单峰变形为峰谷结构。在具有电子或μ子、大的缺失横向动量和至少四个喷流的终态中，在tt[over <$]不变质谱中没有观察到与标准模型预测的显著偏差。结果被解释的背景下，II型两希格斯双重模型。导出了当mA/H>500 GeV时，信号强度的排斥限是质量mA/H和两个Higgs场真空期望值之比tanβ的函数。
A search for heavy pseudoscalar (A) and scalar (H) Higgs bosons decaying into a top quark pair (tt[over ¯]) has been performed with 20.3 fb^{-1} of proton-proton collision data collected by the ATLAS experiment at the Large Hadron Collider at a center-of-mass energy sqrt[s]=8 TeV. Interference effects between the signal process and standard model tt[over ¯] production, which are expected to distort the signal shape from a single peak to a peak-dip structure, are taken into account. No significant deviation from the standard model prediction is observed in the tt[over ¯] invariant mass spectrum in final states with an electron or muon, large missing transverse momentum, and at least four jets. The results are interpreted within the context of a type-II two-Higgs-doublet model. Exclusion limits on the signal strength are derived as a function of the mass m_{A/H} and the ratio of the vacuum expectation values of the two Higgs fields, tanβ, for m_{A/H}>500 GeV.