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arXiv 1507.05930hep-ex
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用ATLAS探测器在$pp$碰撞数据中在$\sqrt{s}$ = 8 TeV的$H\rightarrow ZZ$衰变通道中寻找额外的重希格斯玻色子

Search for an additional, heavy Higgs boson in the $H\rightarrow ZZ$ decay channel at $\sqrt{s}$ = 8 TeV in $pp$ collision data with the ATLAS detector

ATLAS Collaboration

摘要:

利用欧洲核子研究中心(CERN)大型强子对撞机上的ATLAS探测器,在$H\rightarrow\ell\ell\ell\ell$、$H\rightarrow\ell\ellνν$、$H\rightarrow\ell\ell qq$和$H\rightarrowννqq$衰变模式中寻找高质量的希格斯玻色子.搜索使用质子-质子碰撞数据在一个中心的质量能量为8 TeV对应的综合光度为20.3 FB $^{-1}$。搜索的结果被解释的情况下,一个沉重的希格斯玻色子玻色子的宽度是小的实验质量分辨率相比。考虑的希格斯玻色子的质量范围扩展到1 TeV的所有四种衰变模式和低至140 GeV,这取决于衰变模式。同时拟合四种衰变模式得到了重希格斯玻色子玻色子产生截面乘以Z玻色子对的分支比的上限。95%置信水平的上限范围从0.53 pb在$m_H=195$ GeV到0.008 pb在$m_H=950$ GeV的胶子融合生产模式和从0.31 pb在$m_H=195$ GeV到0.009 pb在$m_H=950$ GeV的矢量玻色子融合生产模式。结果也解释的背景下,I型和II型的两个希格斯偶极子模型。

英文摘要:

A search is presented for a high-mass Higgs boson in the $H\rightarrow\ell\ell\ell\ell$, $H\rightarrow\ell\ellνν$, $H\rightarrow\ell\ell qq$, and $H\rightarrowννqq$ decay modes using the ATLAS detector at the CERN Large Hadron Collider. The search uses proton-proton collision data at a centre-of-mass energy of 8 TeV corresponding to an integrated luminosity of 20.3 fb$^{-1}$. The results of the search are interpreted in the scenario of a heavy Higgs boson with a width that is small compared with the experimental mass resolution. The Higgs boson mass range considered extends up to 1 TeV for all four decay modes and down to as low as 140 GeV, depending on the decay mode. No significant excess of events over the Standard Model prediction is found. A simultaneous fit to the four decay modes yields upper limits on the production cross-section of a heavy Higgs boson times the branching ratio to Z boson pairs. 95% confidence level upper limits range from 0.53 pb at $m_H=195$ GeV to 0.008 pb at $m_H=950$ GeV for the gluon-fusion production mode and from 0.31 pb at $m_H=195$ GeV to 0.009 pb at $m_H=950$ GeV for the vector-boson-fusion production mode. The results are also interpreted in the context of Type-I and Type-II two-Higgs-doublet models.

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