Search for an additional, heavy Higgs boson in the $H\rightarrow ZZ$ decay channel at $\sqrt{s} = 8\;\text{ TeV }$ in $pp$ collision data with the ATLAS detector - INSPIRE

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Search for an additional, heavy Higgs boson in the $H\rightarrow ZZ$ decay channel at $\sqrt{s} = 8\;\text{ TeV }$ in $pp$ collision data with the ATLAS detector

ATLAS

Collaboration

Jul 21, 2015

46 pages

Published in:

Eur.Phys.J.C 76 (2016) 1, 45

Published: Jan 25, 2016

e-Print:

1507.05930 [hep-ex]

DOI:

10.1140/epjc/s10052-015-3820-z

PDG: Mass Limits in General two-Higgs-doublet Models

Report number:

CERN-PH-EP-2015-154

Experiments:

CERN-LHC-ATLAS

View in:

reference search314 citations

Citations per year

Abstract: (Springer)

A search is presented for a high-mass Higgs boson in the

H\rightarrow ZZ\rightarrow \ell ^+\ell ^-\ell ^+\ell ^-

,

H\rightarrow ZZ\rightarrow \ell ^+\ell ^-\nu \bar{\nu }

,

H\rightarrow ZZ\rightarrow \ell ^+\ell ^- q \bar{q}

, and

H\rightarrow ZZ\rightarrow \nu \bar{\nu } q \bar{q}

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~\mathrm{TeV}

for all four decay modes and down to as low as 140

\mathrm{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

m_{H} =195

GeV to 0.009 pb at

m_{H} =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.

Note:

46 pages plus author list + cover pages (62 pages total), 17 figures, 4 tables, submitted to EPJC. All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HIGG-2013-20/

p p: scattering
p p: colliding beams
Higgs particle: hadroproduction
gluon gluon: fusion
vector boson: fusion
Higgs particle: heavy
Higgs particle: mass
Higgs particle: decay modes
Z0: pair production
Z0: decay modes

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