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arXiv 2009.09429hep-ex
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$\sqrt{s} =$ 13 TeV质子-质子碰撞中与双喷注相关的极化同号W玻色子对产生截面的测量

Measurements of production cross sections of polarized same-sign W boson pairs in association with two jets in proton-proton collisions at $\sqrt{s} =$ 13 TeV

CMS Collaboration

摘要:

首次测量了质子-质子碰撞中极化同号W $^\pm$ W $^\pm$玻色子对的产生截面。测量是基于在LHC的CMS检测器收集的数据样本,质心能量为13 TeV,对应于137 fb $^{-1}$的积分亮度。事件的选择需要两个相同符号的轻子,电子或μ子,中等丢失的横向动量,和两个喷流与一个大的快度分离和一个大的dijet质量,以提高相同的符号W $^\pm$ W $^\pm$散射事件的贡献。在纵向极化同号W $^\pm$ W $^\pm$玻色子对的产生截面上,将观测(预期)95%置信水平上限设定为1.17(0.88)fb。测量了同号W $^\pm$ W $^\pm$玻色子对的电弱产生,其中至少有一个W玻色子纵向极化,观察到的(预期)显著性为2.3(3.1)个标准差。

英文摘要:

The first measurements of production cross sections of polarized same-sign W$^\pm$W$^\pm$ boson pairs in proton-proton collisions are reported. The measurements are based on a data sample collected with the CMS detector at the LHC at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 137 fb$^{-1}$. Events are selected by requiring exactly two same-sign leptons, electrons or muons, moderate missing transverse momentum, and two jets with a large rapidity separation and a large dijet mass to enhance the contribution of same-sign W$^\pm$W$^\pm$ scattering events. An observed (expected) 95% confidence level upper limit of 1.17 (0.88) fb is set on the production cross section for longitudinally polarized same-sign W$^\pm$W$^\pm$ boson pairs. The electroweak production of same-sign W$^\pm$W$^\pm$ boson pairs with at least one of the W bosons longitudinally polarized is measured with an observed (expected) significance of 2.3 (3.1) standard deviations.

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