Combination of inclusive top-quark pair production cross-section measurements using ATLAS and CMS data at $$ \sqrt{s} $$ = 7 and 8 TeV
Combination of inclusive top-quark pair production cross-section measurements using ATLAS and CMS data at $$ \sqrt{s} $$ = 7 and 8 TeV
复制标题
使用 ATLAS 和 CMS 数据在 $$ sqrt{s} $$ = 7 和 8 TeV 处进行包含性顶夸克对产生横截面测量的组合
DOI：
10.1007/jhep07(2023)213
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发表时间：
2023
影响因子：
5.4
通讯作者：
Abreu, H.
中科院分区：
文献类型：
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作者：
Aad, G.;Abbott, B.;Abbott, D. C.;Abed Abud, A.;Abeling, K.;Abhayasinghe, D. K.;Abidi, S. H.;Aboulhorma, A.;Abramowicz, H.;Abreu, H.
结合测量的包容性顶夸克对生产截面进行ATLAS和CMS在质子-质子碰撞在质心能量为7和8 TeV的大型强子对撞机。截面是用顶夸克对衰变得到的，末态是带相反电荷的电子-μ子对，每次实验的积分光度分别为7 TeV时约5 fb − 1和8 TeV时约20 fb − 1。组合横截面确定为178。5 ± 4。7pb在= 7 TeV和pb在= 8 TeV的相关系数为0.41，使用的参考顶夸克质量值为172.5 GeV。组合截面的比率被确定为R 8/7 = 1。363 ± 0。032.结合测量的截面和它们的比例与理论计算，使用几个部分子分布函数（PDF）集一致。顶夸克极质量（强耦合固定在0.118）和强耦合（顶夸克极质量固定在172.5 GeV）的值通过拟合次-领先阶加上次-领先对数QCD预测的测量从组合结果中提取。使用NNPDF3的版本。1个不含顶夸克测量的PDF集，得到的结果分别为GeV和.
A combination of measurements of the inclusive top-quark pair production cross-section performed by ATLAS and CMS in proton–proton collisions at centre-of-mass energies of 7 and 8 TeV at the LHC is presented. The cross-sections are obtained using top-quark pair decays with an opposite-charge electron–muon pair in the final state and with data corresponding to an integrated luminosity of about 5 fb− 1 at= 7 TeV and about 20 fb− 1 at= 8 TeV for each experiment. The combined cross-sections are determined to be 178. 5±4. 7 pb at= 7 TeV andpb at= 8 TeV with a correlation of 0.41, using a reference top-quark mass value of 172.5 GeV. The ratio of the combined cross-sections is determined to be R 8/7= 1. 363±0. 032. The combined measured cross-sections and their ratio agree well with theory calculations using several parton distribution function (PDF) sets. The values of the top-quark pole mass (with the strong coupling fixed at 0.118) and the strong coupling (with the top-quark pole mass fixed at 172.5 GeV) are extracted from the combined results by fitting a next-to-next-to-leading-order plus next-to-next-to-leading-log QCD prediction to the measurements. Using a version of the NNPDF3. 1 PDF set containing no top-quark measurements, the results obtained areGeV and.