在$\sqrt{s}=13$ TeV的LHC处，W-W与ATLAS共振WZ生产数据混合的改进界限
Improved bounds on W-W' mixing with ATLAS resonant WZ production data at the LHC at $\sqrt{s}=13$ TeV
摘要：
新的带电矢量玻色子$W'$衰变为规范玻色子对$WZ$在新物理的许多场景中被预测，包括具有扩展规范扇区（EGM）的模型。由于各种各样的模型（其他统一群，超对称模型，小希格斯模型，额外的维度）更一般的EGM方法在这里被认为是。对于$W'$ -产生而言，这些模型通过两个参数来参数化，即$W^\prime$质量$M_{W^\prime}$和$W$ - $W^\prime$混合参数$ξ$。diboson $WZ$生产允许放置严格的限制，这个混合角和$W'$质量，我们确定和目前的第一次使用数据从$pp$碰撞在$\sqrt{s}=13$ TeV记录的ATLAS探测器在欧洲核子研究中心大型强子对撞机，与36.1 FB $^{-1}$的综合光度。通过比较实验极限与$W'$共振产生及其随后衰变为$WZ$对的总截面的理论预测，我们表明，基准模型对混合角的导出约束相当小，介于$10^{-4}$和$10^{-3}$之间，即，相对于从产生$ξ\sim 10^{-2}$的电弱数据的全局分析导出的那些，大大改进。我们结合了从$WZ$生产数据得到的限制与从$W'\to eν$过程中得到的限制，以显着扩展$M_{W'}$-$ξ$参数平面中的排除区域，并获得迄今为止最严格的排除限制。我们提出的组合允许的参数空间EGM $W'$玻色子后，将间接约束从低能电弱数据，直接搜索约束从Tevatron和LHC运行I与7和8 TeV，以及在运行II与13 TeV的数据。
英文摘要：
New charged vector bosons $W'$ decaying into gauge boson pairs $WZ$ are predicted in many scenarios of new physics, including models with an extended gauge sector (EGM). Due to the large variety of models (other unification groups, models with Supersymmetry, Little Higgs Models, Extra Dimensions) the more general EGM approach is here considered. For what concerns $W'$-production, these models are parametrised by two parameters, the $W^\prime$ mass $M_{W^\prime}$ and the $W$-$W^\prime$ mixing parameter $ξ$. The diboson $WZ$ production allows to place stringent constraints on this mixing angle and the $W'$ mass, which we determine and present for the first time by using data from $pp$ collisions at $\sqrt{s}=13$ TeV recorded by the ATLAS detector at the CERN LHC, with integrated luminosity of 36.1 fb$^{-1}$. By comparing the experimental limits to the theoretical predictions for the total cross section of $W'$ resonant production and its subsequent decay into $WZ$ pairs, we show that the derived constraints on the mixing angle for the benchmark model are rather small, between $10^{-4}$ and $10^{-3}$, i.e., greatly improved with respect to those derived from the global analysis of electroweak data which yield $ξ\sim 10^{-2}$. We combine the limits derived from $WZ$ production data with those obtained from the $W'\to eν$ process in order to significantly extend the exclusion region in the $M_{W'}$-$ξ$ parameter plane and obtain the most stringent exclusion limits to date. We present the combined allowed parameter space for the EGM $W'$ boson after incorporating indirect constraints from low energy electroweak data, direct search constraints from Tevatron and from the LHC Run I with 7 and 8 TeV as well as at Run II with 13 TeV data.
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