A measurement of the top quark–antiquark pair production cross section σ tt ¯ in proton–proton collisions at a centre-of-mass energy of 13Te 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 ± μ ∓ , μ + μ - , e + e - ) are selected and the cross section is measured from a likelihood fit. For a top quark mass parameter in the simulation of mtMC=172.5Ge the fit yields a measured cross section σtt¯=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 mtMC=172.33±0.14(stat)-0.72+0.66(syst)Ge 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.

Measurement of the t t ¯ production cross section, the top quark mass, and the strong coupling constant using dilepton events in pp collisions at √s=13Te / Sirunyan A.M., Tumasyan A., Adam W., Ambrogi F., Asilar E., Bergauer T., Brandstetter J., Dragicevic M., Ero J., Del Valle A.E., Flechl M., Fruhwirth R., Ghete V.M., Hrubec J., Jeitler M., Krammer N., Kratschmer I., Liko D., Madlener T., Mikulec I., et al.. - In: THE EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS. - ISSN 1434-6044. - ELETTRONICO. - 79:(2019), pp. 0-0. [10.1140/epjc/s10052-019-6863-8]

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

Ciulli V.;D'Alessandro R.;Focardi E.;Latino G.;Lenzi P.;
2019

Abstract

A measurement of the top quark–antiquark pair production cross section σ tt ¯ in proton–proton collisions at a centre-of-mass energy of 13Te 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 ± μ ∓ , μ + μ - , e + e - ) are selected and the cross section is measured from a likelihood fit. For a top quark mass parameter in the simulation of mtMC=172.5Ge the fit yields a measured cross section σtt¯=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 mtMC=172.33±0.14(stat)-0.72+0.66(syst)Ge 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.
2019
79
0
0
Sirunyan A.M.; Tumasyan A.; Adam W.; Ambrogi F.; Asilar E.; Bergauer T.; Brandstetter J.; Dragicevic M.; Ero J.; Del Valle A.E.; Flechl M.; Fruhwirth ...espandi
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Utilizza questo identificatore per citare o creare un link a questa risorsa: https://hdl.handle.net/2158/1195820
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