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FPD Seminar
Probing QCD using top quark pairs: latest results from CMS
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America/Los_Angeles
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The production of top quark pairs at a hadron collider is an ideal process for probing perturbative Quantum Chromodynamics (pQCD). In the current energy and luminosity conditions, the Large Hadron Collider (LHC) at the CERN laboratories in Geneva can produce up to 15 top quark pair events per second. The enormous amount of collected events allows for the precise determination of fundamental QCD parameters such as the top quark mass and the strong coupling constant. The precise knowledge of the values of these parameters not only allows the uncertainty of QCD calculations to be reduced, but can also be used, e.g. to predict the stability of the electroweak vacuum at the Planck scale.
In this seminar I will focus on the latest results obtained with data collected by the CMS experiment at the CERN LHC. These include a precise determination of the top quark mass and the strong coupling constant, which are extracted from a measurement of the inclusive top quark pair production cross section at the centre-of-mass energy of 13 TeV using theoretical predictions at next-to-next-to-leading order (NNLO) in QCD. This analysis is then extended in order to perform the first experimental investigation of the running of the top quark mass, which is probed up to a scale of the order of 1 TeV. Finally, I will present a measurement of the normalized triple-differential top quark pair production cross section at the centre-of-mass energy of 13 TeV, which is used in combination with Deep Inelastic Scattering (DIS) data from the DESY HERA in order to perform a global QCD analysis in which the parton distribution functions (PDFs) are determined simultaneously with the top quark mass and the strong coupling constant.
