arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1706.03046hep-ex
收藏

用ATLAS探测器测量$\sqrt{s} = 8$ TeV质子-质子碰撞中的$t\bar{t}γ$产生截面

Measurement of the $t\bar{t}γ$ production cross section in proton-proton collisions at $\sqrt{s} = 8$ TeV with the ATLAS detector

ATLAS Collaboration

摘要:

与光子相关的顶夸克对的截面是在质子-质子碰撞中测量的,质心能量为$\sqrt{s} = 8$ TeV,$20.2$ fb $^{-1}$是2012年在大型强子对撞机上由ATLAS探测器收集的数据。测量是通过选择事件,包含一个光子的横向动量$p_\mathrm{T} > 15$ GeV,一个孤立的轻子具有大的横向动量,大的横向动量失踪,至少有四个喷流,其中至少有一个被确定为源自$b$ -夸克。生产截面在接近选择要求的基准区域中测量。发现它是$139 \pm 7 (\mathrm{stat.}) \pm 17 (\mathrm{syst.})$ fb,与$151 \pm 24$ fb的次领先阶的理论预测很好地一致。此外,在基准区域中的微分截面测量作为光子的横动量和赝快度的函数。

英文摘要:

The cross section of a top-quark pair produced in association with a photon is measured in proton-proton collisions at a centre-of-mass energy of $\sqrt{s} = 8$ TeV with $20.2$ fb$^{-1}$ of data collected by the ATLAS detector at the Large Hadron Collider in 2012. The measurement is performed by selecting events that contain a photon with transverse momentum $p_\mathrm{T} > 15$ GeV, an isolated lepton with large transverse momentum, large missing transverse momentum, and at least four jets, where at least one is identified as originating from a $b$-quark. The production cross section is measured in a fiducial region close to the selection requirements. It is found to be $139 \pm 7 (\mathrm{stat.}) \pm 17 (\mathrm{syst.})$ fb, in good agreement with the theoretical prediction at next-to-leading order of $151 \pm 24$ fb. In addition, differential cross sections in the fiducial region are measured as a function of the transverse momentum and pseudorapidity of the photon.

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。

↑