Search for an additional, heavy Higgs boson in the H→ ZZ decay channel at √s = 8 TeV in pp collision data with the ATLAS detector

Mullier, Geoffrey; Haug, Sigve; Weber, Michael; Meloni, Federico; Cervelli, Alberto; Beck, Hans Peter; Stucci, Stefania; Ereditato, Antonio (2016). Search for an additional, heavy Higgs boson in the H→ ZZ decay channel at √s = 8 TeV in pp collision data with the ATLAS detector. European physical journal. C - particles and fields, 76(1) EDP Sciences 10.1140/epjc/s10052-015-3820-z

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A search is presented for a high-mass Higgs boson in the H → ZZ → ℓ⁺ℓ⁻ℓ⁺ℓ⁻, H →ℓℓνν , H→ ZZ → ℓ⁺ℓ⁻ qq , and H→ννqq decay modes using the ATLAS detector at the CERN Large Hadron Collider. The search uses proton-proton collision data at a centre-of-mass energy of 8 TeV corresponding to an integrated luminosity of 20.3 fb⁻¹. The results of the search are interpreted in the scenario of a heavy Higgs boson with a width that is small compared with the experimental mass resolution. The Higgs boson mass range considered extends up to 1 TeV for all four decay modes and down to as low as 140 GeV, depending on the decay mode. No significant excess of events over the Standard Model prediction is found. A simultaneous fit to the four decay modes yields upper limits on the production cross-section of a heavy Higgs boson times the branching ratio to Z boson pairs. 95% confidence level upper limits range from 0.53 pb at m H =195 GeV to 0.008 pb at m H =950 GeV for the gluon-fusion production mode and from 0.31 pb at mH =195 GeV to 0.009 pb at mH =950 GeV for the vector-boson-fusion production mode. The results are also interpreted in the context of Type-I and Type-II two-Higgs-doublet models.

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:

26 Jul 2017 13:08

Last Modified:

30 Jul 2017 02:16

Publisher DOI:

10.1140/epjc/s10052-015-3820-z

Additional Information:

Kollaboration - Es sind nur die Berner Autoren namentlich erwähnt.

BORIS DOI:

10.7892/boris.100031

URI:

https://boris.unibe.ch/id/eprint/100031

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