Measurements of four-lepton production in pp collisions at √s= 8 TeV with the ATLAS detector

Mullier, Geoffrey; Haug, Sigve; Weber, Michael; Meloni, Federico; Cervelli, Alberto; Beck, Hans Peter; Stucci, Stefania; Ereditato, Antonio (2016). Measurements of four-lepton production in pp collisions at √s= 8 TeV with the ATLAS detector. Physics letters. B, 753, pp. 552-572. Elsevier 10.1016/j.physletb.2015.12.048

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The four-lepton (4ℓ , ℓ=e,μ) production cross section is measured in the mass range from 80 to 1000 GeV using 20.3 fb⁻¹ of data in pp collisions at √s =8 TeV collected with the ATLAS detector at the LHC. The 4ℓ events are produced in the decays of resonant Z and Higgs bosons and the non-resonant ZZ continuum originating from qq, gg, and qg initial states. A total of 476 signal candidate events are observed with a background expectation of 26.2±3.6 events, enabling the measurement of the integrated cross section and the differential cross section as a function of the invariant mass and transverse momentum of the four-lepton system. In the mass range above 180 GeV, assuming the theoretical constraint on the qq production cross section calculated with perturbative NNLO QCD and NLO electroweak corrections, the signal strength of the gluon-fusion component relative to its leading-order prediction is determined to be μgg =2.4±1.0(stat.)±0.5(syst.)±0.8(theory) .

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:

0370-2693

Publisher:

Elsevier

Language:

English

Submitter:

Annette Krebs-Wegenast

Date Deposited:

16 Aug 2017 09:48

Last Modified:

16 Aug 2017 09:48

Publisher DOI:

10.1016/j.physletb.2015.12.048

Additional Information:

Kollaboration - Es sind nur die Berner Autoren namentlich erwähnt.

BORIS DOI:

10.7892/boris.100016

URI:

https://boris.unibe.ch/id/eprint/100016

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