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Measurements of the $t\overline{t}$ production cross section in lepton+jets final states in pp collisions at 8 TeV and ratio of 8 to 7 TeV cross sections


CMS Collaboration; Canelli, Florencia; Kilminster, Benjamin; Aarestad, Thea; Caminada, Lea; De Cosa, Annapaoloa; Del Burgo, Riccardo; Donato, Silvio; Galloni, Camilla; Hinzmann, Andreas; Hreus, Tomas; Ngadiuba, Jennifer; Pinna, Deborah; Rauco, Giorgia; Robmann, Peter; Salerno, Daniel; Schweiger, Korbinian; Seitz, Claudia; Takahashi, Yuta; Zucchetta, Alberto; et al (2017). Measurements of the $t\overline{t}$ production cross section in lepton+jets final states in pp collisions at 8 TeV and ratio of 8 to 7 TeV cross sections. European Physical Journal C - Particles and Fields, C77(1):15.

Abstract

A measurement of the top quark pair production$t\overline{t}$ cross section in proton–proton collisions at the centre-of-mass energy of 8 TeV is presented using data collected with the CMS detector at the LHC, corresponding to an integrated luminosity of 19.6 $fb^{-1}$. This analysis is performed in the $t\overline{t}$ decay channels with one isolated, high transverse momentum electron or muon and at least four jets, at least one of which is required to be identified as originating from hadronization of a b quark. The calibration of the jet energy scale and the efficiency of b jet identification are determined from data. The measured $t\overline{t}$ cross section is $228.5 \pm 3.8(stat) \pm 13.7 (syst) \pm 6.0(lumi) pb$. This measurement is compared with an analysis of 7 TeV data, corresponding to an integrated luminosity of 5.0 $fb^{-1}$, to determine the ratio of 8 TeV to 7 TeV cross sections, which is found to be $1.43 \pm 0.04(stat) \pm 0.07(syst) \pm 0.05(lumi)$. The measurements are in agreement with QCD predictions up to next-to-next-to-leading order.

Abstract

A measurement of the top quark pair production$t\overline{t}$ cross section in proton–proton collisions at the centre-of-mass energy of 8 TeV is presented using data collected with the CMS detector at the LHC, corresponding to an integrated luminosity of 19.6 $fb^{-1}$. This analysis is performed in the $t\overline{t}$ decay channels with one isolated, high transverse momentum electron or muon and at least four jets, at least one of which is required to be identified as originating from hadronization of a b quark. The calibration of the jet energy scale and the efficiency of b jet identification are determined from data. The measured $t\overline{t}$ cross section is $228.5 \pm 3.8(stat) \pm 13.7 (syst) \pm 6.0(lumi) pb$. This measurement is compared with an analysis of 7 TeV data, corresponding to an integrated luminosity of 5.0 $fb^{-1}$, to determine the ratio of 8 TeV to 7 TeV cross sections, which is found to be $1.43 \pm 0.04(stat) \pm 0.07(syst) \pm 0.05(lumi)$. The measurements are in agreement with QCD predictions up to next-to-next-to-leading order.

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Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Physics Institute
Dewey Decimal Classification:530 Physics
Language:English
Date:2017
Deposited On:11 Dec 2017 15:24
Last Modified:18 Dec 2017 15:56
Publisher:Springer
ISSN:1434-6044
Free access at:Publisher DOI. An embargo period may apply.
Publisher DOI:https://doi.org/10.1140/epjc/s10052-016-4504-z

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