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Measurement of the tt¯ production cross section, the top quark mass, and the strong coupling constant using dilepton events in pp collisions at ?s=13TeV

Abstract: A measurement of the top quark?antiquark pair production cross section ?tt¯ in proton?proton collisions at a centre-of-mass energy of 13TeV is presented. The data correspond to an integrated luminosity of 35.9fb?1, recorded by the CMS experiment at the CERN LHC in 2016. Dilepton events (e ± ???, ?+??, e+e?) are selected and the cross section is measured from a likelihood fit. For a top quark mass parameter in the simulation of mMCt=172.5GeV the fit yields a measured cross section ?tt¯=803±2(stat)±25(syst)±20(lumi)pb, in agreement with the expectation from the standard model calculation at next-to-next-to-leading order. A simultaneous fit of the cross section and the top quark mass parameter in the POWHEG simulation is performed. The measured value of mMCt=172.33±0.14(stat)+0.66?0.72(syst)GeV is in good agreement with previous measurements. The resulting cross section is used, together with the theoretical prediction, to determine the top quark mass and to extract a value of the strong coupling constant with different sets of parton distribution functions.

Otras publicaciones de la misma revista o congreso con autores/as de la Universidad de Cantabria

 Fuente: Eur. Phys. J. C 79, 368 (2019)

Editorial: Springer New York LLC

 Fecha de publicación: 01/04/2019

Nº de páginas: 36

Tipo de publicación: Artículo de Revista

 DOI: 10.1140/epjc/s10052-019-6863-8

ISSN: 1434-6044,1434-6052

Url de la publicación: https://doi.org/10.1140/epjc/s10052-019-6863-8