标题： 在ATLAS探测器中，于$\sqrt{s}$=13 TeV的$pp$碰撞中，搜索重矢量类夸克对产生并衰变为高$p_T$ $W$ 玻色子和顶夸克的轻子加喷注末态 显示英文标题

标题： Search for pair production of heavy vector-like quarks decaying into high-$p_T$ $W$ bosons and top quarks in the lepton-plus-jets final state in $pp$ collisions at $\sqrt{s}$=13 TeV with the ATLAS detector

摘要： 对重矢量类 $B$ 夸克对产生的搜索，主要针对 $B$ 夸克衰变为 $W$ 玻色子和顶夸克的情况。 该搜索基于 $36.1$ $fb^{-1}$ 次 $pp$ 碰撞，在 $\sqrt{s}$ = 13 TeV 下于2015年和2016年使用CERN大型强子对撞机上的ATLAS探测器记录的数据。 Data are analysed in the lepton-plus-jets final state, characterised by a high-transverse-momentum isolated electron or muon, large missing transverse momentum, and multiple jets, of which at least one is $b$-tagged. No significant deviation from the Standard Model expectation is observed. The 95% confidence level lower limit on the $B$ mass is 1350 GeV assuming a 100% branching ratio to $Wt$. 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 into other final states ($Zb$ and $Hb$) and thus mass limits on $B$ production are set as a function of the decay branching ratios. 100% 分支比限制也被发现适用于重矢量类似$X$的产生，电荷为$+$5/3，衰变为$Wt$。 显示英文摘要

摘要： A search is presented for the pair production of heavy vector-like $B$ quarks, primarily targeting $B$ quark decays into a $W$ boson and a top 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, characterised by a high-transverse-momentum isolated electron or muon, large missing transverse momentum, and multiple jets, of which at least one is $b$-tagged. No significant deviation from the Standard Model expectation is observed. The 95% confidence level lower limit on the $B$ mass is 1350 GeV assuming a 100% branching ratio to $Wt$. 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 into other final states ($Zb$ and $Hb$) and thus mass limits on $B$ production are set as a function of the decay branching ratios. The 100% branching ratio limits are found to be also applicable to heavy vector-like $X$ production, with charge $+$5/3, that decay into $Wt$.