Compact Muon Solenoid
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| CMS-PAS-TOP-18-004 | ||
| Measurements of normalised multi-differential cross sections for top quark pair production in pp collisions at $\sqrt{s}= $ 13 TeV and simultaneous determination of the strong coupling strength, top quark pole mass and parton distribution functions | ||
| CMS Collaboration | ||
| November 2018 | ||
| Abstract: Normalised multi-differential cross sections for top quark pair (${\mathrm{t}}\bar{\mathrm{t}}$) production are measured in pp collisions at a centre-of-mass energy of 13 TeV using events containing two opposite-sign leptons. The analysed dataset was recorded by the CMS detector in 2016 and corresponds to an integrated luminosity of 35.9 fb$^{-1}$. The ${\mathrm{t}}\bar{\mathrm{t}}$ cross section is measured double-differentially as a function of the kinematic properties of the top quark and the ${\mathrm{t}}\bar{\mathrm{t}}$ system at parton level in the full phase space. A triple-differential measurement is performed as a function of the invariant mass and rapidity of the ${\mathrm{t}}\bar{\mathrm{t}}$ system and the multiplicity of additional jets at particle level in the event. The data are compared to predictions of Monte Carlo event generators that complement next-to-leading-order (NLO) QCD calculations with parton showers. Together with a fixed order NLO QCD calculation the triple-differential measurement is used to extract values of the strong coupling strength ($\alpha_{\mathrm{s}}$) and the top quark pole mass ($m_{\mathrm{t}}^{\mathrm{pole}}$) using several parton distribution function (PDF) sets. Furthermore, a simultaneous fit of PDFs, $\alpha_{\mathrm{s}}$ and $m_{\mathrm{t}}^{\mathrm{pole}}$ is performed at NLO, demonstrating that the new data have significant impact on the gluon PDF and at the same time allow to accurately determine $\alpha_{\mathrm{s}}$ and $m_{\mathrm{t}}^{\mathrm{pole}}$. | ||
| Links: CDS record (PDF) ; inSPIRE record ; CADI line (restricted) ; | ||
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Compact Muon Solenoid LHC, CERN |
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