arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1503.05467hep-ex
收藏

在sqrt(s)= 7和8时质子-质子碰撞中2 l 2 nu通道中ZZ产生截面的测量TeV和三规范耦合的组合约束

Measurements of the ZZ production cross sections in the 2 l 2 nu channel in proton-proton collisions at sqrt(s) = 7 and 8 TeV and combined constraints on triple gauge couplings

CMS Collaboration

摘要:

测量了质心能量为7和8 TeV的质子-质子碰撞中的ZZ产生截面。候选事件的轻子衰变模式ZZ到2 l 2 nu,其中l表示电子或μ子,重建和选择从数据对应的积分亮度的5.1(19.6)的反飞秒在7(8)TeV的CMS实验收集。测量的截面,σ(pp到ZZ)= 5.1 - 1.4 + 1.5(stat)-1.1 +1.4(syst)+/- 0.1(lumi)pb(7 TeV)和7.2 - 0.8 + 0.8(stat.)-1.5 +1.9(syst)+/- 0.2(lumi)pb,与标准模型的预测值符合得很好,精度达到了次领先阶。所选择的数据进行分析,以寻找异常的三重规范耦合涉及ZZ的最终状态。在与标准模型预测没有任何偏差的情况下,对相关参数设定限制。这些限制,然后结合先前公布的CMS结果ZZ在4升的最终状态,产生最严格的约束异常耦合。

英文摘要:

Measurements of the ZZ production cross sections in proton-proton collisions at center-of-mass energies of 7 and 8 TeV are presented. Candidate events for the leptonic decay mode ZZ to 2 l 2 nu, where l denotes an electron or a muon, are reconstructed and selected from data corresponding to an integrated luminosity of 5.1 (19.6) inverse femtobarns at 7 (8) TeV collected with the CMS experiment. The measured cross sections, sigma(pp to ZZ) = 5.1 -1.4 +1.5 (stat) -1.1 +1.4 (syst) +/- 0.1 (lumi) pb at 7 TeV, and 7.2 -0.8 +0.8 (stat.) -1.5 +1.9 (syst) +/- 0.2 (lumi) pb at 8 TeV, are in good agreement with the standard model predictions with next-to-leading-order accuracy. The selected data are analyzed to search for anomalous triple gauge couplings involving the ZZ final state. In the absence of any deviation from the standard model predictions, limits are set on the relevant parameters. These limits are then combined with the previously published CMS results for ZZ in 4 l final states, yielding the most stringent constraints on the anomalous couplings.

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。

↑