Soft-gluon resummation effects on parton distributions

Corcella, Gennaro; Magnea, Lorenzo

doi:10.1103/physrevd.72.074017

Cited by 38 publications

(48 citation statements)

References 41 publications

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“…Some higher twist effects in PVDIS have previously been investigated in the literature [16]. One should also note that at large x perturbative calculations beyond leading order can become unstable and threshold resummations need to be performed [17].…”

Section: Electroweak Structure Functionsmentioning

confidence: 99%

Finite-Q2corrections to parity-violating DIS

Hobbs

Melnitchouk

2008

Phys. Rev. D

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Parity-violating deep inelastic scattering (PVDIS) has been proposed as an important new tool to extract the flavor and isospin dependence of parton distributions in the nucleon. We discuss finite-Q 2 effects in PVDIS asymmetries arising from subleading kinematical corrections and longitudinal contributions to the γZ interference. For the proton, these need to be accounted for in order to accurately extract the d/u ratio at large x; for the deuteron they are important to consider when searching for evidence of charge symmetry violation in parton distributions or signals for physics beyond the standard model. We further explore the dependence of PVDIS asymmetries for polarized targets on the u and d helicity distributions at large x.

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Section: Electroweak Structure Functionsmentioning

confidence: 99%

Finite-Q2corrections to parity-violating DIS

Hobbs

Melnitchouk

2008

Phys. Rev. D

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“…2 We will include the soft-gluon resummation contributions in this indirect way since, as discussed in ref. [24], we would like to stick to the fixed order NNLO calculation for two main reasons: i) there are not yet parton distribution functions which include soft-gluon resummation and it appears inconsistent to fold a partonic cross section with PDFs that are not at the same order of perturbation theory (although the effects might be small in practice [42]) and ii) the soft-gluon resummation is not available for the Higgs+jet production cross sections and/or the Higgs cross sections including kinematical cuts (both are known only at NNLO [43][44][45][46][47]) which, ultimately, are the basic experimental inputs. level of a few percent; there are also small mixed NNLO QCD-electroweak effects which have been calculated [37] in an effective approach valid for M H ≪ M W .…”

Section: The Higgs Production Cross Sectionsmentioning

confidence: 99%

Higgs production at the lHC

Baglio

Djouadi

2011

J. High Energ. Phys.

172

194

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Abstract:We analyze the production of Higgs particles at the early stage of the CERN large Hadron Collider with a 7 TeV center of mass energy (lHC). We first consider the case of the Standard Model Higgs boson that is mainly produced in the gluon-gluon fusion channel and to be detected in its decays into electroweak gauge bosons, gg → H → W W, ZZ, γγ. The production cross sections at √ s = 7 TeV and the decay branching ratios, including all relevant higher order QCD and electroweak corrections, are evaluated. An emphasis is put on the various theoretical uncertainties that affect the production rates: the significant uncertainties from scale variation and from the parametrization of the parton distribution functions as well as the uncertainties which arise due to the use of an effective field theory in the calculation of the next-to-next-to-leading order corrections. The parametric uncertainties stemming from the values of the strong coupling constant and the heavy quark masses in the Higgs decay branching ratios, which turn out to be non-negligible, are also discussed. The implications for different center of mass energies of the proton collider, √ s = 8-10 TeV as well as for the design energy √ s = 14 TeV, are briefly summarized. We then discuss the production of the neutral Higgs particles of the Minimal Supersymmetric extension of the Standard Model in the two main channels: gluon-gluon and bottom quark fusion leading to Higgs bosons which subsequently decay into tau lepton or b-quark pairs, gg, bb → Higgs → τ + τ − , bb. The Higgs production cross sections at the lHC and the decay branching ratios are analyzed. The associated theoretical uncertainties are found to be rather large and will have a significant impact on the parameter space of the model that can be probed.

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“…[8,9] the NNPDF collaboration has proposed a method for the parametrization of structure functions and parton distributions, and has constructed a parametrization of the proton, deuteron, and nonsinglet F NS 2 ≡ F p 2 − F n 2 structure functions based on all available experimental information, including experimental and theoretical uncertainties and their correlation. This parametrization has been recently used by various authors [10,11,12] as an unbiased interpolation of existing data.…”

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confidence: 99%