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arXiv 1302.0508hep-ex
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在sqrt(s)= 7 TeV时pp碰撞中全喷流终态t t-杆产生截面的测量

Measurement of the t t-bar production cross section in the all-jet final state in pp collisions at sqrt(s) = 7 TeV

CMS Collaboration

摘要:

测量的t-t-酒吧截面(西格玛[ttbar])在质子-质子碰撞的质心能量为7 TeV,在所有的喷流的最终状态,其中至少包含六个喷流,其中两个被标记为起源于b夸克。这些数据对应的积分亮度为3.54毫微微粒子恩,收集与CMS探测器在大型强子对撞机。截面通过背景和t t-棒信号与数据中t-棒候选者的重建质谱的未分组极大似然拟合来确定,其中事件经受运动学拟合,假设t t-棒到W+ b W-b-棒到6个射流假设。测量结果为sigma[ttbar] = 139 +/- 10(统计)+/- 26(系统)+/- 3(lum.)Pb,与在其它T-T-棒衰变通道中获得的结果一致,以及与标准模型的预测一致。

英文摘要:

A measurement is presented of the t t-bar cross section (sigma[ttbar]) in proton-proton collisions at a centre-of-mass energy of 7 TeV, in the all-jet final state that contains at least six jets, two of which are tagged as originating from b quarks. The data correspond to an integrated luminosity of 3.54 inverse femtobarns, collected with the CMS detector at the LHC. The cross section is determined through an unbinned maximum likelihood fit of background and t t-bar signal to the reconstructed mass spectrum of t t-bar candidates in the data, in which events are subjected to a kinematic fit assuming a t t-bar to W+ b W- b-bar to 6 jets hypothesis. The measurement yields sigma[ttbar] = 139 +/- 10 (stat.) +/- 26 (syst.) +/- 3 (lum.) pb, a result consistent with those obtained in other t t-bar decay channels, as well as with predictions of the standard model.

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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