PHANTOM: A Monte Carlo event generator for six parton final states at high energy colliders

Ballestrero, A.; Belhouari, A.; Bevilacqua, G.; Kashkan, V.; Maina, Ezio

doi:10.1016/j.cpc.2008.10.005

Cited by 64 publications

(49 citation statements)

References 79 publications

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“…On-shell and off-shell events from gluon fusion production are generated with the MCFM 6.7 [24,41,42] and GG2VV 3.1.5 [43] MC generators while those for the VBF and associated production with an electroweak boson V are generated with PHANTOM 1.2.3 [44]. The leptonic decay of the associated V boson is modeled with a reweighting procedure based on the branching ratios of the V boson [45], and the relatively small contribution of HH production is removed from the PHANTOM simulation.…”

Section: The Cms Experiments and Simulationmentioning

confidence: 99%

Limits on the Higgs boson lifetime and width from its decay to four charged leptons

Khachatryan¹,

Sirunyan²,

Tumasyan³

et al. 2015

Phys. Rev. D

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Constraints on the lifetime and width of the Higgs boson are obtained from H → ZZ → 4l events using data recorded by the CMS experiment during the LHC run 1 with an integrated luminosity of 5.1 and 19.7 fb −1 at a center-of-mass energy of 7 and 8 TeV, respectively. The measurement of the Higgs boson lifetime is derived from its flight distance in the CMS detector with an upper bound of τ H < 1.9 × 10 −13 s at the 95% confidence level (C.L.), corresponding to a lower bound on the width of Γ H > 3.5 × 10 −9 MeV. The measurement of the width is obtained from an off-shell production technique, generalized to include anomalous couplings of the Higgs boson to two electroweak bosons. From this measurement, a joint constraint is set on the Higgs boson width and a parameter f ΛQ that expresses an anomalous coupling contribution as an on-shell cross-section fraction. The limit on the Higgs boson width is Γ H < 46 MeV with f ΛQ unconstrained and Γ H < 26 MeV for f ΛQ ¼ 0 at the 95% C.L. The constraint f ΛQ < 3.8 × 10 −3 at the 95% C.L. is obtained for the expected standard model Higgs boson width.

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Section: The Cms Experiments and Simulationmentioning

confidence: 99%

Limits on the Higgs boson lifetime and width from its decay to four charged leptons

Khachatryan¹,

Sirunyan²,

Tumasyan³

et al. 2015

Phys. Rev. D

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“…Besides the irreducible background, some other processes at O(α 4 EW α 2 s ) [9] with the same final states particles are also produced by PHANTOM. These processes are denoted as "QCD background" in the following.…”

Section: Monte Carlo Samplesmentioning

confidence: 99%

“…The PHANTOM events generator [9] is used to generate qq → qqμ ± νμ ± ν processes at O(α 6 EW ), since it performs the full calculations at O(α 6 EW + α 4 EW α 2 S ) order. This is necessary, since the study aims at comparing the WW scattering spectra under two different Higgs boson hypotheses: thus it is of crucial importance to correctly calculate the cross sections, by considering the interferences between the various tree-level diagrams present in the WW scattering process calculation.…”

Section: Monte Carlo Samplesmentioning

confidence: 99%

Same sign WW scattering process as a probe of Higgs boson in pp collision at $\sqrt{s}=10$ TeV

et al. 2011

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WW scattering is an important process to study electroweak symmetry breaking in the Standard Model at the LHC, in which the Higgs mechanism or other new physics processes must intervene to preserve the unitarity of the process below 1 TeV. This channel is expected to be one of the most sensitive to determine whether the Higgs boson exists. In this paper, the final state with two same sign Ws is studied, with a simulated sample corresponding to the integrated luminosity of 60 fb −1 in pp collision at √ s = 10 TeV. Two observables, the invariant mass of μμ from W decays and the azimuthal angle difference between the two μs, are utilized to distinguish the Higgs boson existence scenario from the Higgs boson absence scenario. A good signal significance for the two cases can be achieved. If we define the separation power of the analysis as the distance, in the loglikelihood plane, of pseudo-experiments outcomes in the two cases, with the total statistics expected from the AT-LAS and CMS experiments at the nominal center-of-mass energy of 14 TeV, the separation power will be at the level of 4 σ .

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“…Apart from the need of a Breit-Wigner smearing of cross sections calculated in the narrowwidth limit that can be easily implemented, interference effects with "background" processes can become important and need to be accounted for. Such effects have been considered in full generality at LO in studies of vector boson scattering [29,30] and, for leptonic final states of the vector bosons, in EW production of V 1 V 2 j j at NLO in QCD [31][32][33][34].…”

Section: Setting the Stagementioning

confidence: 99%

Vector boson fusion at next-to-next-to-leading order in QCD: Standard model Higgs boson and beyond

et al. 2012

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Weak vector boson fusion provides a unique channel to directly probe the mechanism of electroweak symmetry breaking at hadron colliders. We present a method that allows to calculate total cross sections to next-to-next-to-leading order (NNLO) in QCD for an arbitrary V * V * → X process, the so-called structure function approach. By discussing the case of Higgs production in detail, we estimate several classes of previously neglected contributions and we argue that such method is accurate at a precision level well above the typical residual scale and PDF uncertainties at NNLO. Predictions for cross sections at the Tevatron and the LHC are presented for a variety of cases: the Standard Model Higgs (including anomalous couplings), neutral and charged scalars in extended Higgs sectors and (fermiophobic) vector resonance production. Further results can be easily obtained through the public use of the VBF@NNLO code.

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PHANTOM: A Monte Carlo event generator for six parton final states at high energy colliders

Cited by 64 publications

References 79 publications

Limits on the Higgs boson lifetime and width from its decay to four charged leptons

Limits on the Higgs boson lifetime and width from its decay to four charged leptons

Same sign WW scattering process as a probe of Higgs boson in pp collision at $\sqrt{s}=10$ TeV

Vector boson fusion at next-to-next-to-leading order in QCD: Standard model Higgs boson and beyond

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