Next-to-leading order QCD corrections to Z boson pair production via vector-boson fusion

Physical Review D (Impact Factor: 4.64). 05/2006; 73(11). DOI: 10.1103/PhysRevD.73.113006
Source: arXiv


Vector-boson fusion processes are an important tool for the study of electroweak symmetry breaking at hadron colliders, since they allow to distinguish a light Higgs boson scenario from strong weak boson scattering. We here consider the channels WW->ZZ and ZZ->ZZ as part of electroweak Z boson pair production in association with two tagging jets. We present the calculation of the NLO QCD corrections to the cross sections for p p -> e+ e- mu+ mu- + 2 jets and p p -> e+ e- nu_mu nubar_mu + 2 jets via vector-boson fusion at order alpha_s alpha^6, which is performed in the form a NLO parton-level Monte Carlo program. The corrections to the integrated cross sections are found to be modest, while the shapes of some kinematical distributions change appreciably at NLO. Residual scale uncertainties typically are at the few percent level.

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    • "We observe non-trivial behaviors of the K factors, varying from 0.8 to 1.7 for the default scale. The rapidity-separation distribution shows that NLO QCD corrections are important at large separation (∆y tags > 4), which is the phase space region selected by VBF cuts [7] to enhance V V → V V scatterings. "
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    ABSTRACT: We present a calculation of next-to-leading order QCD corrections to QCD-induced ZZ production in association with two jets at hadron colliders. Both Z bosons decay leptonically with all off-shell effects, virtual photon contributions and spin-correlation effects fully taken into account. This process is an important background to weak boson scattering and to searches for signals of new physics beyond the Standard Model. As expected, the next-to-leading order corrections reduce significantly the scale uncertainty and show a non-trivial phase space dependence in kinematic distributions. Our code will be publicly available as part of the parton level Monte Carlo program VBFNLO.
    Journal of High Energy Physics 07/2014; 2014(7):148. DOI:10.1007/JHEP07(2014)148 · 6.11 Impact Factor
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    • "In the last few years QCD corrections to boson–boson production via vector boson fusion [31] [32] [33] [34] at the LHC have been computed and turn out to be below 10%. Recently, VBFNLO [35], a Monte Carlo program for vector boson fusion, double and triple vector boson production at NLO QCD accuracy, limited to the leptonic decays of vector bosons, has been released. "
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    ABSTRACT: Unitarization models describe phenomenologically the high energy behaviour of a strongly interacting symmetry breaking sector. In this work, predictions of some unitarized models in vector boson scattering at LHC are studied and compared with analogous studies in Equivalent Vector Boson Approximation and previous results for the benchmark no-Higgs scenario. To perform such studies, unitarized model amplitudes have been implemented in the PHANTOM Monte Carlo in a complete calculation with six fermions in the final state.
    Journal of High Energy Physics 12/2011; 2012(3). DOI:10.1007/JHEP03(2012)031 · 6.11 Impact Factor
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    • "Since, within the SM, the photon does not couple directly to Z bosons, only graphs corresponding to topology (b) contribute to neutral current (NC) production modes. For the calculation of the matrix elements we employ the methods applied already to a variety of WBF reactions [24] [25] [26] [27] [28] [29], based on the helicity-amplitude techniques of Ref. [30] [31]. We decompose all Feynman diagrams into fermionic currents for each quark line and bosonic tensors parameterizing the gauge-boson interaction in the t-channel. "
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    ABSTRACT: Higgs boson production in association with a hard central photon and two forward tagging jets is expected to provide valuable information on Higgs boson couplings in a range where it is difficult to disentangle weak-boson fusion processes from large QCD backgrounds. We present next-to-leading order QCD corrections to Higgs production in association with a photon via weak-boson fusion at a hadron collider in the form of a flexible parton-level Monte Carlo program. The QCD corrections to integrated cross sections are found to be small for experimentally relevant selection cuts, while the shape of kinematic distributions can be distorted by up to 20% in some regions of phase space. Residual scale uncertainties at next-to-leading order are at the few-percent level. KeywordsNLO Computations–Higgs Physics–QCD–Standard Model
    Journal of High Energy Physics 06/2010; 2010(8):1-17. DOI:10.1007/JHEP08(2010)088 · 6.11 Impact Factor
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