Measurements of top-quark pair differential cross-sections in the lepton+jets channel in pp collisions at √s=8 TeV using the ATLAS detector

Mullier, Geoffrey; Haug, Sigve; Weber, Michael; Meloni, Federico; Cervelli, Alberto; Beck, Hans Peter; Stucci, Stefania; Ereditato, Antonio (2016). Measurements of top-quark pair differential cross-sections in the lepton+jets channel in pp collisions at √s=8 TeV using the ATLAS detector. European physical journal. C - particles and fields, 76(10) EDP Sciences 10.1140/epjc/s10052-016-4366-4

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Measurements of normalized differential cross-sections of top-quark pair production are presented as a function of the top-quark, tt system and event-level kinematic observables in proton-proton collisions at a centre-of-mass energy of √s=8 TeV. The observables have been chosen to emphasize the tt production process and to be sensitive to effects of initial- and final-state radiation, to the different parton distribution functions, and to non-resonant processes and higher-order corrections. The dataset corresponds to an integrated luminosity of 20.3 fb⁻¹, recorded in 2012 with the ATLAS detector at the CERN Large Hadron Collider. Events are selected in the lepton+jets channel, requiring exactly one charged lepton and at least four jets with at least two of the jets tagged as originating from a b-quark. The measured spectra are corrected for detector effects and are compared to several Monte Carlo simulations. The results are in fair agreement with the predictions over a wide kinematic range. Nevertheless, most generators predict a harder top-quark transverse momentum distribution at high values than what is observed in the data. Predictions beyond NLO accuracy improve the agreement with data at high top-quark transverse momenta. Using the current settings and parton distribution functions, the rapidity distributions are not well modelled by any generator under consideration. However, the level of agreement is improved when more recent sets of parton distribution functions are used.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Physics Institute > Laboratory for High Energy Physics (LHEP)

UniBE Contributor:

Haug, Sigve; Weber, Michael and Beck, Hans Peter

Subjects:

500 Science > 530 Physics
500 Science > 510 Mathematics

ISSN:

1434-6044

Publisher:

EDP Sciences

Language:

English

Submitter:

Annette Krebs-Wegenast

Date Deposited:

15 Aug 2017 07:43

Last Modified:

20 Aug 2017 02:17

Publisher DOI:

10.1140/epjc/s10052-016-4366-4

Additional Information:

Kollaboration - Es sind nur die Berner Autoren namentlich erwähnt.

BORIS DOI:

10.7892/boris.100003

URI:

https://boris.unibe.ch/id/eprint/100003

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