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arXiv 1608.03086hep-ex
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用ATLAS探测器测量在$\sqrt{s} =8$ TeV质子-质子碰撞中与一个喷流有关的$W^+W^-$产生

Measurement of $W^+W^-$ production in association with one jet in proton--proton collisions at $\sqrt{s} =8$ TeV with the ATLAS detector

ATLAS Collaboration

摘要:

使用2012年欧洲核子研究中心大型强子对撞机ATLAS探测器收集的20.3 fb $^{-1}$积分光度数据,研究了在$\sqrt{s} = 8$ TeV的$pp$碰撞中与一个喷流相关的$W$玻色子对的产生。横截面是在一个基准相空间区域中测量的,该区域由恰好一个电子和一个μ子、缺少横向动量和恰好一个横向动量大于25 GeV且赝快度为$|η|<4.5$的射流的存在所定义。轻子需要具有相反的电荷,并通过横动量和赝快度要求。发现基准横截面为$σ^{\mathrm{fid,1\textrm{-}jet}}_{WW}=136\pm6($ stat $)\pm14($ syst $)\pm3($ lumi $)$ fb。结合先前仅限于没有相关喷流的轻子末态的测量,测量到具有零或一个喷流的$WW$产生的基准截面为$σ^{\mathrm{fid,}\leq\mathrm{1\textrm{-}jet}}_{WW}=511\pm9($ stat $)\pm26($ syst $)\pm10($ lumi $)$ fb。在具有一个和零个射流的最终状态下的基准截面的比率被确定为$0.36\pm0.05$。最后,总截面外推$WW$生产的基准测量与零或一个相关的射流的报告。测量结果与理论预测进行了比较,并发现在良好的协议。

英文摘要:

The production of $W$ boson pairs in association with one jet in $pp$ collisions at $\sqrt{s} = 8$ TeV is studied using data corresponding to an integrated luminosity of 20.3 fb$^{-1}$ collected by the ATLAS detector during 2012 at the CERN Large Hadron Collider. The cross section is measured in a fiducial phase-space region defined by the presence of exactly one electron and one muon, missing transverse momentum and exactly one jet with a transverse momentum above 25 GeV and a pseudorapidity of $|η|<4.5$. The leptons are required to have opposite electric charge and to pass transverse momentum and pseudorapidity requirements. The fiducial cross section is found to be $σ^{\mathrm{fid,1\textrm{-}jet}}_{WW}=136\pm6($stat$)\pm14($syst$)\pm3($lumi$)$ fb. In combination with a previous measurement restricted to leptonic final states with no associated jets, the fiducial cross section of $WW$ production with zero or one jet is measured to be $σ^{\mathrm{fid,}\leq\mathrm{1\textrm{-}jet}}_{WW}=511\pm9($stat$)\pm26($syst$)\pm10($lumi$)$ fb. The ratio of fiducial cross sections in final states with one and zero jets is determined to be $0.36\pm0.05$. Finally, a total cross section extrapolated from the fiducial measurement of $WW$ production with zero or one associated jet is reported. The measurements are compared to theoretical predictions and found in good agreement.

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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