Resonance-Continuum Interference in the Diphoton Higgs Signal at the LHC

Dixon, Lance J.; Siu, M. Stewart

doi:10.1103/physrevlett.90.252001

Cited by 86 publications

(91 citation statements)

References 39 publications

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“…To model both aspects, including their respective uncertainties, the MC simulation events and theoretical considerations described in section 4 are used. To account for the interference between the signal and background diphoton final states [112], the expected gluon-gluon fusion process cross section is reduced by 2.5% for all values of m H .…”

Section: Signal and Background Modellingmentioning

confidence: 99%

Observation of a new boson with mass near 125 GeV in pp collisions at $ \sqrt{s}=7 $ and 8 TeV

Chatrchyan¹,

Khachatryan²,

Sirunyan³

et al. 2013

J. High Energ. Phys.

554

427

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A detailed description is reported of the analysis used by the CMS Collaboration in the search for the standard model Higgs boson in pp collisions at the LHC, which led to the observation of a new boson. The data sample corresponds to integrated luminosities up to 5.1 fb −1 at √ s = 7 TeV, and up to 5.3 fb −1 at √ s = 8 TeV. The results for five Higgs boson decay modes γγ, ZZ, WW, τ τ , and bb, which show a combined local significance of 5 standard deviations near 125 GeV, are reviewed. A fit to the invariant mass of the two high resolution channels, γγ and ZZ → 4 , gives a mass estimate of 125.3 ± 0.4 (stat.) ± 0.5 (syst.) GeV. The measurements are interpreted in the context of the standard model Lagrangian for the scalar Higgs field interacting with fermions and vector bosons. The measured values of the corresponding couplings are compared to the standard model predictions. The hypothesis of custodial symmetry is tested through the measurement of the ratio of the couplings to the W and Z bosons. All the results are consistent, within their uncertainties, with the expectations for a standard model Higgs boson. The CMS collaboration 106 Keywords: Hadron-Hadron Scattering IntroductionThe standard model (SM) [1-3] of particle physics accurately describes many experimental results that probe elementary particles and their interactions up to an energy scale of a few hundred GeV [4]. In the SM, the building blocks of matter, the fermions, are comprised of quarks and leptons. The interactions are mediated through the exchange of force carriers: the photon for electromagnetic interactions, the W and Z bosons for weak interactions, and the gluons for strong interactions. All the elementary particles acquire mass through their interaction with the Higgs field [5][6][7][8][9][10][11][12][13]. This mechanism, called the "Higgs" or "BEH" mechanism [5][6][7][8][9][10], is the first coherent and the simplest solution for giving mass to W and Z bosons, while still preserving the symmetry of the Lagrangian. It is realized by introducing a new complex scalar field into the model. By construction, this field allows the W and Z bosons to acquire mass whilst the photon remains massless, and adds to the model one new scalar particle, the SM Higgs boson (H). The Higgs scalar field and its conjugate can also give mass to the fermions, through Yukawa interactions [11][12][13] The discovery or exclusion of the SM Higgs boson is one of the primary scientific goals of the LHC. Previous direct searches at the LHC were based on data from protonproton collisions corresponding to an integrated luminosity of 5.1 fb −1 collected at a centreof-mass energy of 7 TeV. The CMS experiment excluded at 95% CL masses from 127 to 600 GeV [20]. The ATLAS experiment excluded at 95% CL the ranges 111. . Within the remaining allowed mass region, an excess of events between 2 and 3 standard deviations (σ) near 125 GeV was reported by both experiments. In 2012, the proton-proton centre-of-mass energy was increased to 8 TeV, and by the end of June, an...

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Section: Signal and Background Modellingmentioning

confidence: 99%

Observation of a new boson with mass near 125 GeV in pp collisions at $ \sqrt{s}=7 $ and 8 TeV

Chatrchyan¹,

Khachatryan²,

Sirunyan³

et al. 2013

J. High Energ. Phys.

554

427

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“…[22]. We emphasize that signal-background interference effects must always be accounted for by dedicated calculations such as in Refs [33][34][35][36][37].…”

Section: Higgs Boson Width and Signal-background Interferencementioning

confidence: 99%

Inclusive Higgs boson cross-section for the LHC at 8 TeV

Anastasiou

Buehler

Herzog

et al. 2012

J. High Energ. Phys.

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We present the inclusive Higgs boson cross-section at the LHC with collision energy of 8 TeV. Our predictions are obtained using our publicly available program iHixs which incorporates NNLO QCD corrections and electroweak corrections. We review the convergence of the QCD perturbative expansion at this new energy and examine the impact of finite Higgs width effects. We also study the impact of different parton distribution functions on the cross-section. We present tables with the cross-section values and estimates for their uncertainty due to uncalculated higher orders in the perturbative expansion and parton densities.

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“…This continuum is known to be large and in particular there is a non negligible interference between the box contribution and Higgs production through the heavy quark three point loop. These terms are well known [42][43][44][45][46][47][48][49][50][51][52][53][54][55] and are essential for accurate phenomenological predictions. The region of large invariant masses of the four final state leptons in gg → ZZ, W W → 4l has been studied in detail in ref.…”

Section: Resultsmentioning

confidence: 99%