arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1408.0886hep-ex
收藏

用ATLAS探测器搜索$\sqrt{s}$ = 8 TeV的pp碰撞中的$W' \rightarrow tb \rightarrow qqbb$衰变

Search for $W' \rightarrow tb \rightarrow qqbb$ Decays in pp Collisions at $\sqrt{s}$ = 8 TeV with the ATLAS Detector

ATLAS Collaboration

摘要:

利用ATLAS探测器在大型强子对撞机的$pp$碰撞中对衰变为顶夸克和底夸克的大质量$W'$规范玻色子进行了探测。该数据集是在质量中心能量为$\sqrt{s} = 8$ TeV时获得的,对应于20.3 fb $^{-1}$的积分光度。这种分析是在强子衰变模式的顶夸克,新的喷子结构技术被用来识别高动量顶夸克的喷气机。这允许在$1.5 - 3.0$ TeV范围内搜索高质量$W'$玻色子。$b$ -标记用于识别源自$b$ -夸克的喷流。数据与标准模型仅背景预期一致,并且在95%置信水平下对$W' \rightarrow tb$横截面乘以分支比设定上限,对于左手$W'$玻色子,范围为$0.16$ pb至$0.33$ pb,对于纯右手耦合的$W'$玻色子,范围为$0.10$ pb至$0.21$ pb。在95%置信水平的上限设置在$W'$ -玻色子耦合到$tb$上,作为使用有效场理论方法的$W'$质量的函数,其独立于预测$W'$玻色子的特定模型的细节。

英文摘要:

A search for a massive $W'$ gauge boson decaying to a top quark and a bottom quark is performed with the ATLAS detector in $pp$ collisions at the LHC. The dataset was taken at a centre-of-mass energy of $\sqrt{s} = 8$ TeV and corresponds to 20.3 fb$^{-1}$ of integrated luminosity. This analysis is done in the hadronic decay mode of the top quark, where novel jet substructure techniques are used to identify jets from high-momentum top quarks. This allows for a search for high-mass $W'$ bosons in the range $1.5 - 3.0$ TeV. $b$-tagging is used to identify jets originating from $b$-quarks. The data are consistent with Standard Model background-only expectations, and upper limits at 95% confidence level are set on the $W' \rightarrow tb$ cross section times branching ratio ranging from $0.16$ pb to $0.33$ pb for left-handed $W'$ bosons, and ranging from $0.10$ pb to $0.21$ pb for $W'$ bosons with purely right-handed couplings. Upper limits at 95% confidence level are set on the $W'$-boson coupling to $tb$ as a function of the $W'$ mass using an effective field theory approach, which is independent of details of particular models predicting a $W'$ boson.

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。

↑