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arXiv 1707.03347hep-ex
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用ATLAS探测器研究$\sqrt{s}$ =13 TeV的PDMATHAAD碰撞中轻子加喷注末态中衰变为高$p_{\text{T}}$ $W$玻色子和$b$夸克的对产生

Search for pair production of heavy vector-like quarks decaying to high-$p_{\text{T}}$ $W$ bosons and $b$ quarks in the lepton-plus-jets final state in $pp$ collisions at $\sqrt{s}$=13 TeV with the ATLAS detector

ATLAS Collaboration

摘要:

研究了重矢量类$T$夸克和$B$夸克的对产生,主要目标是$T$夸克衰变为$W$玻色子和$b$夸克。该搜索基于2015年和2016年在欧洲核子研究中心大型强子对撞机上使用ATLAS探测器记录的$\sqrt{s}$ = 13 TeV的$pp$碰撞的$36.1$ fb $^{-1}$。数据分析轻子加喷流的最终状态,包括至少一个$b$标记的喷流和一个大半径的喷流确定为起源于强子衰变的高动量$W$玻色子。在重建的$T$质量分布中未观察到与标准模型预期的显著偏离。假设$Wb$的分支比为100%,则观测到的$T$质量的95%置信水平下限为1350 GeV。在SU(2)单态情况下,质量下限为1170 GeV。这种搜索对重矢量类$B$夸克衰变到$Wt$和其他最终状态也很敏感。因此,重新解释的结果提供了一个95%的置信水平下的$B$夸克质量在1250 GeV假设100%的分支比$Wt$的下限;在SU(2)单态的情况下,限制是1080 GeV。$T$和$B$生产的质量限制也被设置为衰变分支比的函数。发现100%分支比限度适用于分别衰变为$Wb$和$Wt$的重载体样$Y$和$X$生产。

英文摘要:

A search is presented for the pair production of heavy vector-like $T$ and $B$ quarks, primarily targeting the $T$ quark decays to a $W$ boson and a $b$-quark. The search is based on $36.1$ fb$^{-1}$ of $pp$ collisions at $\sqrt{s}$ = 13 TeV recorded in 2015 and 2016 with the ATLAS detector at the CERN Large Hadron Collider. Data are analysed in the lepton-plus-jets final state, including at least one $b$-tagged jet and a large-radius jet identified as originating from the hadronic decay of a high-momentum $W$ boson. No significant deviation from the Standard Model expectation is observed in the reconstructed $T$ mass distribution. The observed 95% confidence level lower limit on the $T$ mass are 1350 GeV assuming 100% branching ratio to $Wb$. In the SU(2) singlet scenario, the lower mass limit is 1170 GeV. This search is also sensitive to a heavy vector-like $B$ quark decaying to $Wt$ and other final states. The results are thus reinterpreted to provide a 95% confidence level lower limit on the $B$ quark mass at 1250 GeV assuming 100% branching ratio to $Wt$; in the SU(2) singlet scenario, the limit is 1080 GeV. Mass limits on both $T$ and $B$ production are also set as a function of the decay branching ratios. The 100% branching ratio limits are found to be applicable to heavy vector-like $Y$ and $X$ production that decay to $Wb$ and $Wt$, respectively.

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