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Measurement of the integrated and differential $t\overline{t}$ production cross sections for high-$p_{T}$ top quarks in pp collisions at $\sqrt{s}$ = 8 TeV


CMS Collaboration; Canelli, F; Chiochia, V; Kilminster, B; Robmann, P; et al (2016). Measurement of the integrated and differential $t\overline{t}$ production cross sections for high-$p_{T}$ top quarks in pp collisions at $\sqrt{s}$ = 8 TeV. Physical review. D, 94(7):072002.

Abstract

The cross section for pair production of top quarks ($t\overline{t}$) with high transverse momenta is measured in pp collisions, collected with the CMS detector at the LHC with $\sqrt{s}$=8  TeV in data corresponding to an integrated luminosity of 19.7  fb$^{−1}$. The measurement is performed using lepton+jets events, where one top quark decays semileptonically, while the second top quark decays to a hadronic final state. The hadronic decay is reconstructed as a single, large-radius jet, and identified as a top quark candidate using jet substructure techniques. The integrated cross section and the differential cross sections as a function of top quark $p_{T}$ and rapidity are measured at particle level within a fiducial region related to the detector-level requirements and at parton level. The particle-level integrated cross section is found to be $σ_{t\overline{t}}$=0.499±0.035(stat+syst)±0.095(theo)±0.013(lumi)  pb for top quark $p_{T}$>400  GeV. The parton-level measurement is $σ_{t\overline{t}}$=1.44±0.10(stat+syst)±0.29(theo)±0.04(lumi)  pb. The integrated and differential cross section results are compared to predictions from several event generators.

Abstract

The cross section for pair production of top quarks ($t\overline{t}$) with high transverse momenta is measured in pp collisions, collected with the CMS detector at the LHC with $\sqrt{s}$=8  TeV in data corresponding to an integrated luminosity of 19.7  fb$^{−1}$. The measurement is performed using lepton+jets events, where one top quark decays semileptonically, while the second top quark decays to a hadronic final state. The hadronic decay is reconstructed as a single, large-radius jet, and identified as a top quark candidate using jet substructure techniques. The integrated cross section and the differential cross sections as a function of top quark $p_{T}$ and rapidity are measured at particle level within a fiducial region related to the detector-level requirements and at parton level. The particle-level integrated cross section is found to be $σ_{t\overline{t}}$=0.499±0.035(stat+syst)±0.095(theo)±0.013(lumi)  pb for top quark $p_{T}$>400  GeV. The parton-level measurement is $σ_{t\overline{t}}$=1.44±0.10(stat+syst)±0.29(theo)±0.04(lumi)  pb. The integrated and differential cross section results are compared to predictions from several event generators.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Physics Institute
Dewey Decimal Classification:530 Physics
Language:English
Date:2016
Deposited On:11 Jan 2017 10:49
Last Modified:09 Mar 2017 10:28
Publisher:American Physical Society
ISSN:2470-0010
Publisher DOI:https://doi.org/10.1103/PhysRevD.94.072002

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Licence: Creative Commons: Attribution 3.0 Unported (CC BY 3.0)

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