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Searches for the Standard Model Higgs boson have been performed in the H → Z Z → 4, H → γ γ and H → W W → eνμν channels with the ATLAS experiment at the Large Hadron Collider [11] using 5.8–

Observation of a new particle in the search for the Standard Model Higgs boson with the ATLAS detector at the LHC

Physics Letters B, (2012)

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摘要

of the individual channels entering the combination. The transition points between separately optimised mH regions are indicated where applicable. In channels sensitive to associated production of the Higgs boson, V indicates a W or Z boson. The symbols ⊗ and ⊕ represent direct products and sums over sets of selection requirements, respec...更多

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简介
  • The Standard Model (SM) of particle physics [1–4] has been tested by many experiments over the last four decades and has been shown to successfully describe high energy particle interactions.
  • A control region is defined by removing the isolation requirement on the leptons in the sub-leading pair, and by requiring that at least one of the sub-leading muons fails the transverse impact parameter significance selection
  • These modifications remove Z Z (∗) contributions, and allow both the ttand Z + jets backgrounds to be estimated simultaneously using a fit to the m12 distribution.
  • The potential bias is defined by the largest absolute signal yield obtained from the likelihood fit to the simulated background samples for hypothesised Higgs boson masses in the range 110–150 GeV.
重点内容
  • The Standard Model (SM) of particle physics [1–4] has been tested by many experiments over the last four decades and has been shown to successfully describe high energy particle interactions
  • Searches for the Standard Model Higgs boson have been performed in the H → Z Z (∗) → 4, H → γ γ and H → W W (∗) → eνμν channels with the ATLAS experiment at the Large Hadron Collider [11] (LHC) using 5.8
  • These results are combined with earlier results [17], which are based on an integrated luminosity of 4.6–4.8 fb−1 recorded in 2011 at a centre-of-mass energy of 7 TeV, except for the H → Z Z (∗) → 4 and H → γ γ channels, which have been updated with the improved analyses presented here
  • The Standard Model Higgs boson is excluded at 95% confidence level (CL) in the mass range 111–559 GeV, except for the narrow region 122– 131 GeV
  • The excess is driven by the two channels with the highest mass resolution, H → Z Z (∗) → 4 and H → γ γ, and the sensitive but lowresolution H → W W (∗) → ν ν channel
方法
  • The statistical procedure used to interpret the data is described in Refs. [17,118–121].
  • The parameter of interest is the global signal strength factor μ, which acts as a scale factor on the total number of events predicted by the Standard Model for the Higgs boson signal
  • This factor is defined such that μ = 0 corresponds to the background-only hypothesis and μ = 1 corresponds to the.
  • Hypothesised values of μ are tested with a statistic λ(μ) based on the profile likelihood ratio [122]
  • This test statistic extracts the information on the signal strength from a full likelihood fit to the data.
  • The likelihood function includes all the parameters that describe the systematic uncertainties and their correlations
结果
  • The weight wi for events in category i ∈ [1, 10] for the 7 TeV and 8 TeV data samples is defined to be ln (1 + Si/Bi), where Si is 90% of the expected signal for mH = 126.5 GeV, and Bi is the integral, in a window containing Si , of a background-only fit to the data.
结论
  • Searches for the Standard Model Higgs boson have been performed in the H → Z Z (∗) → 4 , H → γ γ and H → W W (∗) → eνμν channels with the ATLAS experiment at the LHC using 5.8–

    5.9 fb−1 of pp collision data recorded during April to June 2012 at a centre-of-mass energy of 8 TeV.
  • The Standard Model Higgs boson is excluded at 95% CL in the mass range 111–559 GeV, except for the narrow region 122– 131 GeV.
  • In this region, an excess of events with significance.
表格
  • Table1: Event generators used to model the signal and background proc√esses. “PYTHIA” i√ndicates that PYTHIA6 and PYTHIA8 are used for simulations of s = 7 TeV and s = 8 TeV data, respectively
  • Table2: S√ummary of the √estimated numbers of Z + jets and ttbackground events, for the s = 7 TeV and s = 8 TeV data in the entire phase-space of the analysis after the kinematic selections described in the text. The backgrounds are combined for the 2μ2e and 4e channels, as discussed in the text. The first uncertainty is statistical, while the second is systematic
  • Table3: The numbers of expected signal (mH = 125 GeV) and background events, together with the numbers of observed eve√nts in the data,√in a window of size ±5 GeV around 125 GeV, for the combined s = 7 TeV and s = 8 TeV data
  • Table4: Number of events in the data (ND) and expected number of signal events (NS) for
  • Table5: The expected numbers of signal (mH = 125 GeV) and background events after all selections, including a cut on the transverse mass of 0.75 mH < mT < mH for mH =
Download tables as Excel
基金
  • We thank also the support staff at our institutions without whose excellent contributions ATLAS could not have been successfully constructed or operated so efficiently. We acknowledge the support of ANPCyT, Argentina; YerPhI, Armenia; ARC, Australia; BMWF, Austria; ANAS, Azerbaijan; SSTC, Belarus; CNPq and FAPESP, Brazil; NSERC, NRC and CFI, Canada; CERN; CONICYT, Chile; CAS, MOST and NSFC, China; COLCIENCIAS, Colombia; MSMT CR, MPO CR and VSC CR, Czech Republic; DNRF, DNSRC and Lundbeck Foundation, Denmark; EPLANET and ERC, European Union; IN2P3-CNRS, CEA-DSM/IRFU, France; GNAS, Georgia; BMBF, DFG, HGF, MPG and AvH Foundation, Germany; GSRT, Greece; ISF, MINERVA, GIF, DIP and Benoziyo Center, Israel; INFN, Italy; MEXT and JSPS, Japan; CNRST, Morocco; FOM and NWO, Netherlands; RCN, Norway; MNiSW, Poland; GRICES and FCT, Portugal; MERYS (MECTS), Romania; MES of Russia and ROSATOM, Russian Federation; JINR; MSTD, Serbia; MSSR, Slovakia; ARRS and MVZT, Slovenia; DST/NRF, South Africa; MICINN, Spain; SRC and Wallenberg Foundation, Sweden; SER, SNSF and Cantons of Bern and Geneva, Switzerland; NSC, Taiwan; TAEK, Turkey; STFC, the Royal Society and Leverhulme Trust, United Kingdom; DOE and NSF, United States of America. The crucial computing support from all WLCG partners is acknowledged gratefully, in particular from CERN and the ATLAS Tier-1 facilities at TRIUMF (Canada), NDGF (Denmark, Norway, Sweden), CC-IN2P3 (France), KIT/GridKA (Germany), INFN-CNAF (Italy), NL-T1 (Netherlands), PIC (Spain), ASGC (Taiwan), RAL (UK) and BNL (USA) and in the Tier-2 facilities worldwide
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