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

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posted on 2023-06-09, 05:41 authored by Benedict AllbrookeBenedict Allbrooke, Lily AsquithLily Asquith, Alessandro CerriAlessandro Cerri, C A Chavez Barajas, Antonella De SantoAntonella De Santo, Fabrizio SalvatoreFabrizio Salvatore, I Santoyo Castillo, K Suruliz, Mark SuttonMark Sutton, Iacopo Vivarelli, The ATLAS Collaboration
A search is presented for a high-mass Higgs boson in the H ? Z Z ? l+l-l+l-, H ? Z Z ? l+l-?v¯, H ? Z Z ? l+l-qq¯, and H ? Z Z ? ?v¯ qq¯ 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 mH = 195 GeV to 0.008 pb at mH = 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 TypeI and Type-II two-Higgs-doublet models.

Funding

ATLAS; G0275; STFC-SCIENCE AND TECHNOLOGY FACILITIES COUNCIL; ST/I006048/1

History

Publication status

  • Published

File Version

  • Published version

Journal

European Physical Journal C: Particles and Fields

ISSN

1434-6044

Publisher

Springer Verlag

Issue

1

Volume

76

Article number

a45

Department affiliated with

  • Physics and Astronomy Publications

Research groups affiliated with

  • Experimental Particle Physics Research Group Publications

Full text available

  • Yes

Peer reviewed?

  • Yes

Legacy Posted Date

2017-04-10

First Open Access (FOA) Date

2017-04-10

First Compliant Deposit (FCD) Date

2017-04-10

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