Measurements of fiducial cross-sections for tt production with one or two additional b-jets 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 fiducial cross-sections for tt production with one or two additional b-jets in pp collisions at √s =8 TeV using the ATLAS detector. European physical journal. C - particles and fields, 76(1) EDP Sciences 10.1140/epjc/s10052-015-3852-4

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Fiducial cross-sections for tt production with one or two additional b-jets are reported, using an integrated luminosity of 20.3 fb⁻¹ of proton--proton collisions at a centre-of-mass energy of 8 TeV at the Large Hadron Collider, collected with the ATLAS detector. The cross-section times branching ratio for tt events with at least one additional b-jet is measured to be 950 ± 70 (stat.) +240 −190 (syst.) fb in the lepton-plus-jets channel and 50 ± 10 (stat.) +15 −10 (syst.) fb in the eμ channel. The cross-section times branching ratio for events with at least two additional b -jets is measured to be 19.3 ± 3.5 (stat.) ± 5.7 (syst.) fb in the dilepton channel (eμ ,μμ , and ee) using a method based on tight selection criteria, and 13.5 ± 3.3 (stat.) ± 3.6 (syst.) fb using a looser selection that allows the background normalisation to be extracted from data. The latter method also measures a value of 1.30 ± 0.33 (stat.) ± 0.28 (syst.)% for the ratio of tt production with two additional b -jets to tt production with any two additional jets. All measurements are in good agreement with recent theory predictions.

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:

16 Aug 2017 15:42

Last Modified:

20 Aug 2017 02:18

Publisher DOI:

10.1140/epjc/s10052-015-3852-4

Additional Information:

Kollaboration - Es sind nur die Berner Autoren namentlich erwähnt.

BORIS DOI:

10.7892/boris.100026

URI:

https://boris.unibe.ch/id/eprint/100026

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