Measurements of Higgs boson production and couplings in the four-lepton channel in $pp$ collisions at center-of-mass energies of 7 and 8 TeV with the ATLAS detector

Abstract

The final ATLAS Run 1 measurements of Higgs boson production and couplings in the decay channel $H\to Z{Z}^{\ast }\to {\ell }^{+}{\ell }^{-}{\ell }^{{}^{\prime }+}{\ell }^{{}^{\prime }-}$, where $\ell ,{\ell }^{{}^{\prime }}=e$ or $\mu$, are presented. These measurements were performed using $pp$ collision data corresponding to integrated luminosities of 4.5 fb${}^{-1}$ and 20.3 fb${}^{-1}$ at center-of-mass energies of 7 TeV and 8 TeV, respectively, recorded with the ATLAS detector at the LHC. The $H\to Z{Z}^{\ast }\to 4\ell$ signal is observed with a significance of 8.1 standard deviations, with an expectation of 6.2 standard deviations, at $m_H$ = 125.36 GeV, the combined ATLAS measurement of the Higgs boson mass from the $H\to \gamma \gamma$ and $H\to Z{Z}^{\ast }\to 4\ell$ channels. The production rate relative to the Standard Model expectation, the signal strength, is measured in four different production categories in the $H\to Z{Z}^{\ast }\to 4\ell$ channel. The measured signal strength, at this mass, and with all categories combined, is 1.44 ${}_{-0.33}^{+0.40}$. The signal strength for Higgs boson production in gluon fusion or in association with $t\bar{t}$ or $b\bar{b}$ pairs is found to be 1.7 ${}_{-0.4}^{+0.5}$, while the signal strength for vector-boson fusion combined with $WH/ZH$ associated production is found to be 0.3 ${}_{-0.9}^{+1.6}$.

40 pages plus author list + cover pages (54 pages total), 21 figures, 12 tables, submitted to Physical Review D, All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HIGG-2013-21/

References in corpus (22)

• Observation of a new particle in the search for the Standard Model Higgs boson with the ATLAS detector at the LHC
• Observation of a new boson at a mass of 125 GeV with the CMS experiment at the LHC
• PYTHIA 6.4 Physics and Manual
• Parton distributions for the LHC
• Matching NLO QCD computations with Parton Shower simulations: the POWHEG method
• New parton distributions for collider physics
• Event generation with SHERPA 1.1
• Pileup subtraction using jet areas
• MCFM for the Tevatron and the LHC
• Electroweak gauge boson production at hadron colliders through O(alpha_s^2)
• NLO Electroweak Corrections to Higgs Boson Production at Hadron Colliders
• VBFNLO: A parton level Monte Carlo for processes with electroweak bosons
• Electroweak and QCD corrections to Higgs production via vector-boson fusion at the LHC
• Strong and electroweak corrections to the production of Higgs+2jets via weak interactions at the LHC
• Electron and photon energy calibration with the ATLAS detector using LHC Run 1 data
• Precise predictions for the Higgs-boson decay H -> W W/Z Z -> 4 leptons
• Measurement of the muon reconstruction performance of the ATLAS detector using 2011 and 2012 LHC proton-proton collision data
• Measurement of the Higgs boson mass from the $H\to \gamma \gamma$ and $H\to Z{Z}^{\ast }\to 4\ell$ channels with the ATLAS detector using 25 fb${}^{-1}$ of $pp$ collision data
• Electron reconstruction and identification efficiency measurements with the ATLAS detector using the 2011 LHC proton-proton collision data
• Combined search for the Standard Model Higgs boson in pp collisions at sqrt(s) = 7 TeV with the ATLAS detector
• Observation of Z decays to four leptons with the CMS detector at the LHC
• Measurement of the 4l Cross Section at the Z Resonance and Determination of the Branching Fraction of Z->4l in pp Collisions at sqrt(s) = 7 and 8 TeV with ATLAS

Cited by in corpus (44)

• Precise determination of the mass of the Higgs boson and tests of compatibility of its couplings with the standard model predictions using proton collisions at 7 and 8 TeV
• Measurements of properties of the Higgs boson decaying into the four-lepton final state in pp collisions at sqrt(s) = 13 TeV
• HiggsSignals-2: Probing new physics with precision Higgs measurements in the LHC 13 TeV era
• A second Higgs from the Higgs portal
• Fingerprinting the extended Higgs sector using one-loop corrected Higgs boson couplings and future precision measurements
• Higgs production in association with a top-antitop pair in the Standard Model Effective Field Theory at NLO in QCD
• Dark Matter from a Classically Scale-Invariant $SU(3{)}_X$
• Higgs boson production cross-section measurements and their EFT interpretation in the $4\ell$ decay channel at $\sqrt{s}$ = 13 TeV with the ATLAS detector
• Fiducial and differential cross sections of Higgs boson production measured in the four-lepton decay channel in $pp$ collisions at $\sqrt{s}$=8 TeV with the ATLAS detector
• Next-to-leading-order electroweak corrections to the production of four charged leptons at the LHC
• Interpolation between multi-dimensional histograms using a new non-linear moment morphing method
• A search for the $Z\gamma$ decay mode of the Higgs boson in $pp$ collisions at $\sqrt{s}$ = 13 TeV with the ATLAS detector
• Measurements of production cross sections of the Higgs boson in the four-lepton final state in proton-proton collisions at $\sqrt{s}=$ 13 TeV
• Searches for the $Z\gamma$ decay mode of the Higgs boson and for new high-mass resonances in $pp$ collisions at $\sqrt{s}=13$ TeV with the ATLAS detector
• Post-ACME2013 CP-violation in Higgs Physics and Electroweak Baryogenesis
• Search for Higgs boson decay to a charm quark-antiquark pair in proton-proton collisions at $\sqrt{s}$ = 13 TeV
• Evidence for the Higgs boson decay to a $Z$ boson and a photon at the LHC
• Probing the $\mu \nu$SSM with light scalars, pseudoscalars and neutralinos from the decay of a SM-like Higgs boson at the LHC
• The role of MSSM heavy Higgs production in the self coupling measurement of the 125 GeV Higgs boson at the LHC
• Prospect for measuring the CP phase in the $h\tau \tau$ coupling at the LHC
• Higgs Boson Plus Dijets: Higher Order Corrections
• Next-to-next-to-leading order event generation for $Z$ boson pair production matched to parton shower
• Updated constraints on Georgi-Machacek model, and its electroweak phase transition and associated gravitational waves
• Updated global fit of the aligned two-Higgs-doublet model with heavy scalars
• Polarized Z bosons from the decay of a Higgs boson produced in association with two jets at the LHC
• Polarisations of the $Z$ and $W$ bosons in the processes $pp\to ZH$ and $pp\to W_{}^{\pm }H$
• Probing the NMSSM via Higgs boson signatures from stop cascade decays at the LHC
• Vacuum stability bounds on Higgs coupling deviations
• Off-shell Higgs production at the LHC as a probe of the trilinear Higgs coupling
• Higgs boson couplings: measurements and theoretical interpretation
• Search for decays of the 125 GeV Higgs boson into a Z boson and a $\rho$ or $\varphi$ meson
• Measurement of simplified template cross sections of the Higgs boson produced in association with W or Z bosons in the H $\to$ $\mathrm{b}\bar{\mathrm{b}}$ decay channel in proton-proton collisions at $\sqrt{s}$ = 13 TeV
• Constraining the Higgs-Dilaton with LHC and Dark Matter Searches
• Tevatron Constraints on Models of the Higgs Boson with Exotic Spin and Parity Using Decays to Bottom-Antibottom Quark Pairs
• Searching for degenerate Higgs bosons - A profile likelihood ratio method to test for mass-degenerate states in the presence of incomplete data and uncertainties
• Lepton flavor violating Higgs decay at $e^{+}{e}^{-}$ colliders
• Higgs-Precision Constraints on Colored Naturalness
• Higgs couplings and BSM physics: Run I Legacy constraints
• Interpretable Boosted Decision Tree Analysis for the Majorana Demonstrator
• $HZ\gamma$ production at $14\mathrm{TeV}$ LHC in next-to-leading order QCD
• Simultaneous probe of the charm and bottom quark Yukawa couplings using $\mathrm{t}\bar{\mathrm{t}}$H events
• Light dark matter around 100 GeV from the inert doublet model
• Z-dark search with the ATLAS detector
• New conserved tensors and Brans-Dicke type field equation, using integrability condition