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arXiv 1408.5191hep-ex
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用ATLAS探测器测量质心能量为7和8 TeV的$pp$碰撞中希格斯玻色子的产生和四轻子通道中的耦合

Measurements of Higgs boson production and couplings in the four-lepton channel in $pp$ collisions at center-of-mass energies of 7 and 8 TeV with the ATLAS detector

ATLAS Collaboration

摘要:

最后的ATLAS运行1测量希格斯玻色子的生产和耦合的衰变通道$H\to ZZ^{*}\to\ell^+\ell^-\ell^{'+}\ell^{'-}$,其中$\ell,\ell^{'}=e$或$μ$。这些测量是使用$pp$碰撞数据进行的,这些数据分别对应于质心能量为7 TeV和8 TeV的4.5 fb $^{-1}$和20.3 fb $^{-1}$的积分光度,这些数据是在大型强子对撞机上用ATLAS探测器记录的。在$m_{H}$ = 125.36 GeV(来自$H\to γγ$和$H\to ZZ^{*}\to 4\ell$通道的希格斯玻色子质量的组合ATLAS测量)下,观察到$H\to ZZ^{*}\to 4\ell$信号的显著性为8.1标准偏差,预期为6.2标准偏差。在$H\to ZZ^{*}\to 4\ell$通道的四个不同生产类别中测量相对于标准模型期望值的生产率,即信号强度。在该质量下,所有类别组合的测量信号强度为1.44 $^{+0.40}_{-0.33}$。发现在胶子融合中或与$t\bar{t}$或$b\bar{b}$对结合产生的希格斯玻色子的信号强度为1.7 $^{+0.5}_{-0.4}$,而与$WH/ZH$结合产生的矢量玻色子融合的信号强度为0.3 $^{+1.6}_{-0.9}$。

英文摘要:

The final ATLAS Run 1 measurements of Higgs boson production and couplings in the decay channel $H\to ZZ^{*}\to\ell^+\ell^-\ell^{'+}\ell^{'-}$, where $\ell,\ell^{'}=e$ or $μ$, are presented. These measurements were performed using $pp$ collision data corresponding to integrated luminosities of 4.5 fb$^{-1}$ and 20.3 fb$^{-1}$ at center-of-mass energies of 7 TeV and 8 TeV, respectively, recorded with the ATLAS detector at the LHC. The $H\to ZZ^{*}\to 4\ell$ signal is observed with a significance of 8.1 standard deviations, with an expectation of 6.2 standard deviations, at $m_{H}$ = 125.36 GeV, the combined ATLAS measurement of the Higgs boson mass from the $H\to γγ$ and $H\to ZZ^{*}\to 4\ell$ channels. The production rate relative to the Standard Model expectation, the signal strength, is measured in four different production categories in the $H\to ZZ^{*}\to 4\ell$ channel. The measured signal strength, at this mass, and with all categories combined, is 1.44 $^{+0.40}_{-0.33}$. The signal strength for Higgs boson production in gluon fusion or in association with $t\bar{t}$ or $b\bar{b}$ pairs is found to be 1.7 $^{+0.5}_{-0.4}$, while the signal strength for vector-boson fusion combined with $WH/ZH$ associated production is found to be 0.3 $^{+1.6}_{-0.9}$.

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