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.

Khachatryan, V., Sirunyan, A., Tumasyan, A., Adam, W., Asilar, E., Bergauer, T., et al. (2016). Inclusive and differential measurements of the tt¯ charge asymmetry in pp collisions at √s=8 TeV. PHYSICS LETTERS. SECTION B, 757, 154-179 [10.1016/j.physletb.2016.03.060].

Inclusive and differential measurements of the tt¯ charge asymmetry in pp collisions at √s=8 TeV

BRIANZA, LUCA;DINARDO, MAURO EMANUELE;FIORENDI, SARA;GEROSA, RAFFAELE ANGELO;GHEZZI, ALESSIO;GOVONI, PIETRO;MANZONI, RICCARDO ANDREA;MARZOCCHI, BADDER;MORONI, LUIGI;PAGANONI, MARCO;RAGAZZI, STEFANO;TABARELLI DE FATIS, TOMMASO;De Guio, F;Lucchini, M;
2016

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.
Articolo in rivista - Articolo scientifico
Charge asymmetry; CMS; Physics; Top quark;
English
2016
757
154
179
none
Khachatryan, V., Sirunyan, A., Tumasyan, A., Adam, W., Asilar, E., Bergauer, T., et al. (2016). Inclusive and differential measurements of the tt¯ charge asymmetry in pp collisions at √s=8 TeV. PHYSICS LETTERS. SECTION B, 757, 154-179 [10.1016/j.physletb.2016.03.060].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/153404
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