Article
Nexttoleading order QCD corrections to Z boson pair production via vectorboson fusion
Università degli Studi di MilanoBicocca, Milano, Lombardy, Italy
Physical Review D (Impact Factor: 4.64). 05/2006; 73(11). DOI: 10.1103/PhysRevD.73.113006 Source: arXiv
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 "We observe nontrivial behaviors of the K factors, varying from 0.8 to 1.7 for the default scale. The rapidityseparation 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 nexttoleading order QCD corrections to QCDinduced ZZ production in association with two jets at hadron colliders. Both Z bosons decay leptonically with all offshell effects, virtual photon contributions and spincorrelation 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 nexttoleading order corrections reduce significantly the scale uncertainty and show a nontrivial phase space dependence in kinematic distributions. Our code will be publicly available as part of the parton level Monte Carlo program VBFNLO. 
 "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 noHiggs 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. 
 "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 helicityamplitude techniques of Ref. [30] [31]. We decompose all Feynman diagrams into fermionic currents for each quark line and bosonic tensors parameterizing the gaugeboson interaction in the tchannel. "
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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 weakboson fusion processes from large QCD backgrounds. We present nexttoleading order QCD corrections to Higgs production in association with a photon via weakboson fusion at a hadron collider in the form of a flexible partonlevel 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 nexttoleading order are at the fewpercent level. KeywordsNLO Computations–Higgs Physics–QCD–Standard Model