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

Allbrooke, B M M, Asquith, L, Cerri, A, Chavez Barajas, C A, De Santo, A, Salvatore, F, Santoyo Castillo, I, Suruliz, K, Sutton, M R, Vivarelli, I and The ATLAS Collaboration, (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). a45. ISSN 1434-6044

[img] PDF - Published Version
Available under License Creative Commons Attribution.

Download (3MB)

Abstract

A search is presented for a high-mass Higgs boson in the H → Z Z → ℓ+ℓ−ℓ+ℓ−, H → Z Z → ℓ+ℓ−νv̄, H → Z Z → ℓ+ℓ−qq̄, and H → Z Z → νv̄ qq̄ 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.

Item Type: Article
Schools and Departments: School of Mathematical and Physical Sciences > Physics and Astronomy
Research Centres and Groups: Experimental Particle Physics Research Group
Subjects: Q Science > QC Physics
Depositing User: Billy Wichaidit
Date Deposited: 10 Apr 2017 10:50
Last Modified: 10 Apr 2017 10:51
URI: http://sro.sussex.ac.uk/id/eprint/67316

View download statistics for this item

📧 Request an update
Project NameSussex Project NumberFunderFunder Ref
ATLASG0275STFC-SCIENCE AND TECHNOLOGY FACILITIES COUNCILST/I006048/1