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arXiv 1202.2065hep-ex
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在CDF上标准模型希格斯玻色子产生的组合上限

Combined upper limit on Standard Model Higgs boson production at CDF

Buzatu Adrian

摘要:

希格斯玻色子是标准模型(SM)预言的唯一一种既未被证实也未被反驳的基本粒子。CDF合作已经在许多通道中使用质量中心能量$\sqrt{s}=1.96\tev$的$p\pbar$碰撞进行了SM希格斯搜索。我们提出了最新的联合希格斯玻色子搜索在CDF。自上一年合并以来,通过增加新的渠道、改善现有渠道和增加新的数据样本来提高灵敏度。我们还使用最新的部分子分布函数和$gg \rightarrow H$理论截面时,建模的信号事件产量。使用高达8.2 $\invfb$的积分光度,我们观察到数据和背景预测之间的良好协议。由于我们没有看到希格斯玻色子玻色子过剩,我们将希格斯玻色子玻色子截面的95% CL上限设置在100和200 $\gevcc$之间,其中5个$\gevcc$增量。115和165 $\gevcc$希格斯玻色子玻色子的观测(预期)极限分别为1.55(1.49)和0.75(0.79)$\times$ SM。从去年开始,CDF排除的希格斯玻色子玻色子范围扩大到156.5 - 173.7和100 - 104.5 $\gevcc$。

英文摘要:

The Higgs boson is the only elementary particle predicted by the Standard Model (SM) that has neither been confirmed nor refuted. The CDF collaboration has performed SM Higgs searches in many channels using $p\pbar$ collisions at a centre-of-mass energy $\sqrt{s}=1.96\tev$. We present the latest combined Higgs boson search at CDF. Since the previous year's combination, the sensitivity is increased through the addition of new channels, the improvement of existing channels and the addition of new data samples. We also use the latest parton distribution functions and $gg \rightarrow H$ theoretical cross sections when modelling the signal event yields. Using integrated luminosities of up to 8.2 $\invfb$, we observe a good agreement between data and the background prediction. Since we do not see a Higgs boson excess, we set 95% CL upper limits on the Higgs boson cross section in the range between 100 and 200 $\gevcc$, with 5 $\gevcc$ increments. The observed (expected) limits for a 115 and a 165 $\gevcc$ Higgs boson are 1.55 (1.49) and 0.75 (0.79) $\times$ SM, respectively. Since last year, the Higgs boson excluded range by CDF is extended to 156.5 - 173.7 and 100 - 104.5 $\gevcc$.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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