Study of the Uncertainty of the Gluon Distribution

Abstract

The uncertainty in the calculation of many important new processes at the Tevatron and LHC is dominated by that concerning the gluon distribution function. We investigate the uncertainty in the gluon distribution of the proton by systematically varying the gluon parameters in the global QCD analysis of parton distributions. The results depend critically on the parton momentum fraction x and the QCD scale Q^2. The uncertainties are presented for integrated gluon-gluon and gluon-quark luminosities for both the Tevatron and LHC as a function of sqrt(tau)=sqrt(x1x2)=sqrt(shat/s), the most relevant quantity for new particle production. The uncertainties are reasonably small, except for large x.

Modified version for publication

References in corpus (1)

• Hera Events, Tevatron Jets, and the Uncertainty On Quarks At Large X

Cited by in corpus (30)

• New Generation of Parton Distributions with Uncertainties from Global QCD Analysis
• Uncertainties of predictions from parton distribution functions II: the Hessian method
• Higgs production in hadron collisions: soft and virtual QCD corrections at NNLO
• Higgs-Boson Production in Association with a Single Bottom Quark
• Higgs-Boson Production in Association with Bottom Quarks at Next-to-Leading Order
• kt Effects in Direct-Photon Production
• Direct Higgs production and jet veto at the Tevatron and the LHC in NNLO QCD
• Measurement of the Inclusive Jet Cross Section in $\bar{p}p$ collisions at $\sqrt{s}=1.8$ TeV
• Small x behaviour of parton distributions with soft initial conditions
• Measuring the top-quark Yukawa coupling at hadron colliders via tth, h->WW
• Small x behavior of parton distributions. A study of higher twist effects
• Measurement of Dijet Cross Sections in Photoproduction at HERA
• Photoproduction of Heavy Quarks in Next-to-Leading Order QCD with Longitudinally Polarized Initial States
• Measurement of direct photon production at Tevatron fixed target energies
• Direct photon cross section with conversions at CDF
• Large-x Parton Distributions
• Truncated moments of parton distributions
• Examination of direct-photon and pion production in proton-nucleon collisions
• Non-perturbative running of the average momentum of non-singlet parton densities
• Virtual photon fragmentation functions
• Inclusive Jet and Dijet Production at the Tevatron
• Higgs-boson production associated with a bottom quark at hadron colliders with SUSY-QCD corrections
• Light Gluino Constituents of Hadrons and a Global Analysis of Hadron Scattering Data
• Moments of singlet parton densities on the lattice in the Schroedinger Functional scheme
• Leptoquark Contribution to the Higgs Boson Production at the LHC Collider
• Factorization scheme dependence of the NLO inclusive jet cross section
• Probing small-$x$ gluons by low-mass Drell-Yan pairs at colliders
• On the application of 'photon+jet' events for setting the absolute jet energy scale and determining the gluon distribution at the LHC
• photon+jet event rate estimation for the gluon distribution determination at the Tevatron Run II
• photon+jet process application for setting the absolute jet energy and determining the gluon distribution at the Tevatron Run II