Higgs Production with Large Transverse Momentum in Hadronic Collisions at Next-to-Leading Order

Florian, Daniel de; Grazzini, Massimiliano; Kunszt, Z.

doi:10.1103/physrevlett.82.5209

Cited by 194 publications

(249 citation statements)

References 25 publications

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“…Previous calculations of differential distributions in NLO using the effective Lagrangian (or the m t → ∞ approach) have been presented in [65]- [69]. In the same approach the resummation of the logarithmically enhanced contributions have been carried out in [70] - [73].…”

Section: DImentioning

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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Section: DImentioning

confidence: 99%

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

2007

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“…This p H T -dependent K-factor rises from approximately 1 at small p H T to 3 at a p H T around 50 § Contrary to the convention adopted in Refs. [12,13,14], we use here the classification of perturbative orders based on the total cross section: the p T spectrum starts at NLO. GeV, and then decreases again to about 2.2 at a p H T of 200 GeV, as shown in Fig.…”

Section: Higgs Signal Selectionmentioning

confidence: 99%

“…At transverse momenta p H T of the order of M H the perturbative expansion is reliable, being controlled by a small expansion parameter α S (M 2 H ). NNLO corrections have been computed, in the large-m top approximation, first numerically [12] and later analytically [13,14] § .…”

Section: Higgs Signal Selectionmentioning

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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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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“…Using the large-M t approximation, the NLO QCD computation of the q T distribution of the SM Higgs boson is presented in Refs. [25,26,27,14,15]. QCD corrections beyond the NLO are evaluated in Ref.…”

Section: Introductionmentioning

confidence: 99%

Higgs boson production at the LHC: Transverse-momentum resummation and rapidity dependence

et al. 2008

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We consider Higgs boson production by gluon fusion in hadron collisions. We study the doubly-differential transverse-momentum (q T ) and rapidity (y) distribution of the Higgs boson in perturbative QCD. In the region of small q T (q T ≪ M H , M H being the mass of the Higgs boson), we include the effect of logarithmicallyenhanced contributions due to multiparton radiation to all perturbative orders. We use the impact parameter and double Mellin moments to implement and factorize the multiparton kinematics constraint of transverse-and longitudinal-momentum conservation. The logarithmic terms are then systematically resummed in exponential form. At small q T , we perform the all-order resummation of large logarithms up to next-to-next-to-leading logarithmic accuracy, while at large q T (q T ∼ M H ), we apply a matching procedure that recovers the fixed-order perturbation theory up to nextto-leading order. We present quantitative results for the differential cross section in q T and y at the LHC, and we comment on the comparison with the q T cross section integrated over y.

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Higgs Production with Large Transverse Momentum in Hadronic Collisions at Next-to-Leading Order

Cited by 194 publications

References 25 publications

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

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

EffectiveK-factors for gg H WW at the LHC

Higgs boson production at the LHC: Transverse-momentum resummation and rapidity dependence

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