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Inclusive and differential measurements of the tt charge asymmetry in pp collisions at $\sqrt{s} = 8$ TeV


CMS Collaboration; Canelli, F; Chiochia, V; Kilminster, B; Robmann, P; et al (2016). Inclusive and differential measurements of the tt charge asymmetry in pp collisions at $\sqrt{s} = 8$ TeV. Physics Letters B, 757:154-179.

Abstract

The tt¯ charge asymmetry is measured in proton–proton collisions at a centre-of-mass energy of 8 TeV . The data, collected with the CMS experiment at the LHC, correspond to an integrated luminosity of 19.7 fb −1 . Selected events contain an electron or a muon and four or more jets, where at least one jet is identified as originating from b-quark hadronization. The inclusive charge asymmetry is found to be 0.0010±0.0068 (stat)±0.0037 (syst) . In addition, differential charge asymmetries as a function of rapidity, transverse momentum, and invariant mass of the tt¯ system are studied. For the first time at the LHC, the measurements are also performed in a reduced fiducial phase space of top quark pair production, with an integrated result of −0.0035±0.0072 (stat)±0.0031 (syst) . All measurements are consistent within two standard deviations with zero asymmetry as well as with the predictions of the standard model.

Abstract

The tt¯ charge asymmetry is measured in proton–proton collisions at a centre-of-mass energy of 8 TeV . The data, collected with the CMS experiment at the LHC, correspond to an integrated luminosity of 19.7 fb −1 . Selected events contain an electron or a muon and four or more jets, where at least one jet is identified as originating from b-quark hadronization. The inclusive charge asymmetry is found to be 0.0010±0.0068 (stat)±0.0037 (syst) . In addition, differential charge asymmetries as a function of rapidity, transverse momentum, and invariant mass of the tt¯ system are studied. For the first time at the LHC, the measurements are also performed in a reduced fiducial phase space of top quark pair production, with an integrated result of −0.0035±0.0072 (stat)±0.0031 (syst) . All measurements are consistent within two standard deviations with zero asymmetry as well as with the predictions of the standard model.

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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:2016
Deposited On:06 Jan 2017 11:38
Last Modified:06 Jan 2017 11:38
Publisher:Elsevier
ISSN:0370-2693
Free access at:Publisher DOI. An embargo period may apply.
Publisher DOI:https://doi.org/http://dx.doi.org/10.1016/j.physletb.2016.03.060

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

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