Measurement of colour flow using jet-pull observables in tt̅ events with the ATLAS experiment at √s = 13 TeV

Rimoldi, Marco; Mullier, Geoffrey; Miucci, Antonio; Merlassino, Claudia; Haug, Sigve; Weber, Michael; Meloni, Federico; Beck, Hans Peter; Ereditato, Antonio (2018). Measurement of colour flow using jet-pull observables in tt̅ events with the ATLAS experiment at √s = 13 TeV. European physical journal. C - particles and fields, 78(10) EDP Sciences 10.1140/epjc/s10052-018-6290-2

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Previous studies have shown that weighted angular moments derived from jet constituents encode the colour connections between partons that seed the jets. This paper presents measurements of two such distributions, the jet-pull angle and jet-pull magnitude, both of which are derived from the jet-pull angular moment. The measurement is performed in tt̅ events with one leptonically decaying W boson and one hadronically decaying W boson, using 36.1fb⁻¹ of pp collision data recorded by the ATLAS detector at √s = 13 TeV delivered by the Large Hadron Collider. The observables are measured for two dijet systems, corresponding to the colour-connected daughters of theWboson and the twob-jets from the top-quark decays, which are not expected to be colour connected. To allow the comparison of the measured distributions to colour model predictions, the measured distributions are unfolded to particle level, after correcting for experimental effects introduced by the detector. While gooda greement can be found for some combinations of predictions and observables, none of the predictions describes the data well across all observables.

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

ISSN:

1434-6044

Publisher:

EDP Sciences

Language:

English

Submitter:

BORIS Import LHEP

Date Deposited:

25 Jun 2019 10:41

Last Modified:

13 Mar 2021 19:43

Publisher DOI:

10.1140/epjc/s10052-018-6290-2

Additional Information:

Kollaboration - Es sind nur die Berner Autoren namentlich erwaehnt

BORIS DOI:

10.7892/boris.129052

URI:

https://boris.unibe.ch/id/eprint/129052

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