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arXiv 1906.05977hep-ex
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在13 TeV双喷射末态中衰减到增强的WW、WZ或ZZ玻色子对的新重共振的多维搜索

A multi-dimensional search for new heavy resonances decaying to boosted WW, WZ, or ZZ boson pairs in the dijet final state at 13 TeV

CMS Collaboration

摘要:

本文提出了一种新的分析方法,在全喷流末态中寻找衰变为WW、WZ或ZZ玻色子对的新的大质量共振。分析的数据进行相应的77.3 fb $^{-1}$记录与CMS实验在大型强子对撞机在一个中心的质量能量为13 TeV的积分亮度。搜索的重点是潜在的共振质量超过1.2 TeV,其中每个W或Z玻色子的衰变产物预计将被准直成一个单一的,大半径的射流。使用三维极大似然拟合的两个射流质量和dijet不变质量的信号被提取,产生的灵敏度的提高高达30%,相对于以前的搜索方法。未观察到超过估计的标准模型背景的过量。在重矢量三重态模型中,自旋1的Z'和W'共振质量分别低于3.5和3.8 TeV,被排除在95%的置信水平。在一个窄宽度的体引力子模型,截面的上限设置在27和0.2 fb之间的共振质量在1.2和5.2 TeV之间,分别。本文提出的极限是迄今为止在dijet最终状态下的最佳极限。

英文摘要:

A search in an all-jet final state for new massive resonances decaying to WW, WZ, or ZZ boson pairs using a novel analysis method is presented. The analysis is performed on data corresponding to an integrated luminosity of 77.3 fb$^{-1}$ recorded with the CMS experiment at the LHC at a centre-of-mass energy of 13 TeV. The search is focussed on potential resonances with masses above 1.2 TeV, where the decay products of each W or Z boson are expected to be collimated into a single, large-radius jet. The signal is extracted using a three-dimensional maximum likelihood fit of the two jet masses and the dijet invariant mass, yielding an improvement in sensitivity of up to 30% relative to previous search methods. No excess is observed above the estimated standard model background. In a heavy vector triplet model, spin-1 Z' and W' resonances with masses below 3.5 and 3.8 TeV, respectively, are excluded at 95% confidence level. In a narrow-width bulk graviton model, upper limits on cross sections are set between 27 and 0.2 fb for resonance masses between 1.2 and 5.2 TeV, respectively. The limits presented in this paper are the best to date in the dijet final state.

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。

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