Higgs production in hadron collisions: soft and virtual QCD corrections at NNLO

Catani, Stefano; Florian, Daniel de; Grazzini, Massimiliano

doi:10.1088/1126-6708/2001/05/025

Cited by 251 publications

(304 citation statements)

References 33 publications

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“…The formalism of Ref. [8] implements a unitarity constraint, such that the integral of the distribution is the total NNLO cross section [3]. At variance with the calculation of Ref.…”

Section: Higgs Signal Selectionmentioning

confidence: 99%

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EffectiveK-factors for gg H WW at the LHC

Davatz

Dissertori

Dittmar

et al. 2004

J. High Energy Phys.

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A simulation of the search for the Standard Model Higgs boson at the LHC, in the channel gg → H → WW → ℓνℓν, is described. Higher-order QCD corrections are taken into account by using a reweighting procedure, which allows us to combine event rates obtained with the PYTHIA Monte Carlo program with the most up-to-date theoretical predictions for the transverse-momentum spectra of the Higgs signal and its corresponding WW background. With this method the discovery potential for Higgs masses between 140 and 180 GeV is recalculated and the potential statistical significance of this channel is found to increase considerably. For a Higgs mass of 165 GeV a signal-to-background ratio of almost 2:1 can be obtained. A statistical significance of five standard deviations might already be achieved with an integrated luminosity close to 0.4 fb −1 . Using this approach, an experimental effective K-factor of about 2.04 is obtained for the considered Higgs signature, which is only about 15% smaller than the theoretical inclusive K-factor.

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“…The formalism of Ref. [8] implements a unitarity constraint, such that the integral of the distribution is the total NNLO cross section [3]. At variance with the calculation of Ref.…”

Section: Higgs Signal Selectionmentioning

confidence: 99%

“…For the dominant Standard Model (SM) Higgs production mechanism, gluon-gluon fusion, and as far as the total cross section is concerned, even next-to-next-to-leading order (NNLO) [3] QCD corrections have been computed * .…”

Section: Introductionmentioning

confidence: 99%

EffectiveK-factors for gg H WW at the LHC

Davatz

Dissertori

Dittmar

et al. 2004

J. High Energy Phys.

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“…The NNLO virtual corrections were computed in [15] by Harlander. The "soft" part of the cross-section at NNLO was derived in [16,17] by extracting contributions to the partonic cross-sections that are singular when the partonic center of mass energy √ŝ equals the mass of the Higgs boson m H . Recently, Harlander and Kilgore [18] obtained an excellent approximation to the complete NNLO result by expanding the phase-space integrals around the kinematic pointŝ = m 2 H .…”

Section: Introductionmentioning

confidence: 99%

Higgs boson production at hadron colliders in NNLO QCD

2002

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We compute the total cross-section for direct Higgs boson production in hadron collisions at NNLO in perturbative QCD. A new technique which allows us to perform an algorithmic evaluation of inclusive phase-space integrals is introduced, based on the Cutkosky rules, integration by parts and the differential equation method for computing master integrals. Finally, we discuss the numerical impact of the O(α 2 s ) QCD corrections to the Higgs boson production cross-section at the LHC and the Tevatron.

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“…At the LHC, Higgs bosons will be predominantly produced through the gluon fusion process due to the large flux of gluons in the protons at these energies. They can be detected through the rare two photon decay mode which has less QCD background than other signals.In pQCD, the total cross sections for the DY production of di-leptons and Higgs boson production are known upto next-to-next-to-leading order (NNLO) level [11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27]. However, due to the complexity involved with the top quark loops, the Higgs production cross sections are only known in the large top quark mass limit beyond the next-to-leading order (NLO).…”

mentioning

confidence: 99%

“…while the σ I are known for both DY and Higgs production upto NNLO level [17][18][19][20][21][22][23][24][25][26][27]. An alternative method is to take N → ∞ on both sides of eqn.…”

mentioning

confidence: 99%

QCD threshold corrections to di-lepton and Higgs rapidity distributions beyond N2LO

2007

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We present threshold enhanced QCD corrections to rapidity distributions of di-leptons in the DrellYan process and of Higgs particles in both gluon fusion and bottom quark annihilation processes using Sudakov resummed cross sections. We have used renormalisation group invariance and the mass factorisation theorem that these hard scattering cross sections satisfy as well as Sudakov resummation of QCD amplitudes. We find that these higher order threshold QCD corrections stabilise the theoretical predictions under scale variations.Perturbative Quantum Chromodynamics (pQCD) provides a framework to successfully compute various observables in the collisions of hadrons at high energies. Recent theoretical advances in the computations of higher order QCD radiative corrections have lead to precise results for several important observables. Because of this progress, we can now predict these observables with unprecedented accuracy for physics studies at the Tevatron collider in Fermilab as well as at the upcoming Large Hadron Collider (LHC) in CERN [1].The Drell-Yan (DY) production of di-leptons [2] has been one of the most important probes of the structure of hadrons. It is also one of the dominant production processes at hadron colliders. At the LHC, it will serve as a luminosity monitor which is very important to precisely calibrate the machine for searches for physics beyond the Standard Model (SM). In DY production, a pair of leptons is produced through the decay of virtual photons, Z and W bosons that result from the collisions of incoming partons (quarks and gluons) in the hadrons. At hadron colliders, the DY process provides precise measurements of various standard model parameters. Rapidity distributions of Z bosons [3] and charge asymmetries of leptons coming from W boson decays [4] can probe the structure of the hadrons and possible excess events in di-lepton invariant mass distributions can point to physics beyond the standard model such as R-parity violating supersymmetric models and models with Z ′ , or with contact interactions [5]. Both D0 and CDF collaborations [6] at the Fermilab Tevatron made precise measurements of Z and W production cross sections and asymmetries which not only allowed for stringent tests of the standard model but also play an important role in the Higgs search at future colliders. These measurements are also possible at the LHC due to the large cross sections for the DY process.The other process which is equally important is Higgs boson production at these colliders because it will establish the Standard Model as well as look for beyond the SM Higgs [7,8]. The Higgs boson, which is responsible for the electroweak symmetry breaking in the Standard Model, is yet to be discovered. The search for this particle has been going on at the Fermilab Tevatron and is one of the most important tasks for the CERN LHC. The LEP experiments in the past provided vital information on the possible mass range of this particle [9]. The lower bound on the mass is 114.4 GeV/c 2 and an upper bound is ...

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Higgs production in hadron collisions: soft and virtual QCD corrections at NNLO

Cited by 251 publications

References 33 publications

EffectiveK-factors for gg H WW at the LHC

EffectiveK-factors for gg H WW at the LHC

Higgs boson production at hadron colliders in NNLO QCD

QCD threshold corrections to di-lepton and Higgs rapidity distributions beyond N2LO

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