论文标题
使用Atlas和CMS数据$ \ sqrt {s} = 7 $和8 TEV的包含顶级生产横截面测量的组合
Combination of inclusive top-quark pair production cross-section measurements using ATLAS and CMS data at $\sqrt{s}= 7$ and 8 TeV
论文作者
论文摘要
在LHC上提出了质子 - 质子碰撞中Atlas和CMS在Proton-Proton碰撞中执行的包含顶Quark对生产横截面的测量结果。横截面是在最终状态下使用与相反的电子元对配对的顶级对衰变获得的，并且数据对应于约5 fb $^{ - 1} $的集成发光度，$ \ sqrt {s} = 7 $ tev and $ \ sqrt {s} = 7 $ tev和约20 fb $^{ - 1} $ at $ \ s $ \ sqrt = 8 $ \ sqrt = 8合并的横截面确定为$ 178.5 \ pm 4.7 $ pb at $ \ sqrt {s} = 7 $ tev和$ 243.3^{+6.0} _ { - 5.9} $ pb at $ \ sqrt {s} = 8 $ tev a in 0.41，使用0.41的相关性，使用一个proode pore pore pore promice pote g pote gore promice pote gore promice pote gore pote gore promice proge pote good prove age g。合并横截面的比率确定为$ r_ {8/7} = 1.363 \ pm 0.032 $。使用多个Parton分布函数（PDF）集，合并的测得的横截面及其比率与理论计算很好。从组合结果中提取了顶级极质量质量的值（具有强的耦合固定为0.118）和强耦合（具有固定为172.5 GEV的顶级极点质量）的值是通过将近代到接头的临界订单到近代到临时的next到next-Next-next-next-next-next-next-next-next-next-next-next-dog QCD预测来提取的。使用不包含顶级测量值的NNPDF3.1 PDF集的版本，获得的结果为$ m_t^\ text {pole} = 173.4^{+ 1.8} _ { - 2.0} $ gev和$ gev和$ g ev和$α__\ text {s}（s}（m_z}（m_z）= 0.1170^0.1170^$ 0.1170^0.00;
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 $\sqrt{s}=7$ TeV and about 20 fb$^{-1}$ at $\sqrt{s}=8$ TeV for each experiment. The combined cross-sections are determined to be $178.5 \pm 4.7$ pb at $\sqrt{s}=7$ TeV and $243.3^{+6.0}_{-5.9}$ pb at $\sqrt{s}=8$ 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 $R_{8/7}= 1.363\pm 0.032$. 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 are $m_t^\text{pole} = 173.4^{+1.8}_{-2.0}$ GeV and $α_\text{s}(m_Z)= 0.1170^{+ 0.0021}_{-0.0018}$.
