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arXiv 1606.04833hep-ex
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用ATLAS探测器探测$\sqrt{s}=13$ TeV中$pp$碰撞的重双玻色子共振

Searches for heavy diboson resonances in $pp$ collisions at $\sqrt{s}=13$ TeV with the ATLAS detector

ATLAS Collaboration

摘要:

利用欧洲核子研究中心(CERN)大型强子对撞机ATLAS探测器收集的$\sqrt{s}=13$ TeV能量下$pp$碰撞的3.2 fb $^{-1}$数据,对新的重共振衰变为$WW$、$WZ$和$ZZ$玻色子进行了研究.分析选择$ννqq$,$\ellνqq$,$\ell\ell qq$和$qqqq$最终状态相结合,寻找一个窄宽度的共振与质量之间的500和3000 GeV。鉴别变量是不变质量或横质量。没有观察到与标准模型预测的显著偏差。三个基准模型进行了测试:一个模型预测存在一个新的重标量单线态,一个简化的模型预测一个重矢量玻色子三重态,和一个散装的Randall-Sundrum模型与一个重自旋-2引力子。横截面限值设定为95%置信水平,并与各种模型的理论横截面预测值进行比较。数据排除了质量低于2650 GeV的标量单线态,质量低于2600 GeV的重矢量玻色子三线态,以及质量低于1100 GeV的引力子。这些结果显着扩展了以前的限制设置使用$pp$碰撞在$\sqrt{s}=8$ TeV。

英文摘要:

Searches for new heavy resonances decaying to $WW$, $WZ$, and $ZZ$ bosons are presented, using a data sample corresponding to 3.2 fb$^{-1}$ of $pp$ collisions at $\sqrt{s}=13$ TeV collected with the ATLAS detector at the CERN Large Hadron Collider. Analyses selecting $ννqq$, $\ellνqq$, $\ell\ell qq$ and $qqqq$ final states are combined, searching for a narrow-width resonance with mass between 500 and 3000 GeV. The discriminating variable is either an invariant mass or a transverse mass. No significant deviations from the Standard Model predictions are observed. Three benchmark models are tested: a model predicting the existence of a new heavy scalar singlet, a simplified model predicting a heavy vector-boson triplet, and a bulk Randall-Sundrum model with a heavy spin-2 graviton. Cross-section limits are set at the 95% confidence level and are compared to theoretical cross-section predictions for a variety of models. The data exclude a scalar singlet with mass below 2650 GeV, a heavy vector-boson triplet with mass below 2600 GeV, and a graviton with mass below 1100 GeV. These results significantly extend the previous limits set using $pp$ collisions at $\sqrt{s}=8$ TeV.

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