Uncertainties on αS in global PDF analyses and implications for predicted hadronic cross sections
@article{Martin2009UncertaintiesO, title={Uncertainties on $\alpha$S in global PDF analyses and implications for predicted hadronic cross sections}, author={A D Martin and William James Stirling and Robert Samuel Thorne and Graeme Watt}, journal={The European Physical Journal C}, year={2009}, volume={64}, pages={653-680} }
AbstractWe determine the uncertainty on the strong coupling αS due to the experimental errors on the data fitted in global analysis of hard-scattering data, within the standard framework of leading-twist fixed-order collinear factorisation in the
$\overline{\mathrm{MS}}$
scheme, finding that αS(MZ2)=0.1202−0.0015+0.0012 at next-to-leading order (NLO) and αS(MZ2)=0.1171−0.0014+0.0014 at next-to-next-to-leading order (NNLO). We do not address in detail the issue of the additional theory…
518 Citations
Unbiased global determination of parton distributions and their uncertainties at NNLO and at LO
- Physics
- 2011
The ABM parton distributions tuned to LHC data
- Physics
- 2014
We present a global fit of parton distributions at next-to-ne xt-to-leading order (NNLO) in QCD. The fit is based on the world data for deep-inelastic scatteri ng, fixed-target data for the Drell-Yan…
Parton distribution function dependence of benchmark Standard Model total cross sections at the 7 TeV LHC
- Physics
- 2011
We compare predictions for the W, Z, gg → H and $ t\bar{t} $ total cross sections at the Large Hadron Collider (LHC), for a centre-of-mass energy of 7 TeV, using the most recent publicly available…
Uncertainties on $$\alpha _S$$αS in the MMHT2014 global PDF analysis and implications for SM predictions
- Physics
- 2015
We investigate the uncertainty in the strong coupling $$\alpha _S(M_{Z}^{2})$$αS(MZ2) when allowing it to be a free parameter in the recent MMHT global analyses of deep-inelastic and related hard…
PDF dependence of Higgs cross sections at the Tevatron and LHC: response to recent criticism
- Physics
- 2011
We respond to some criticism questioning the validity of the current Standard Model Higgs exclusion limits at the Tevatron, due to the significant dependence of the dominant production cross section…
Parton Distribution Functions and Benchmark Cross Sections at NNLO
- Physics
- 2012
We present a determination of parton distribution function s (ABM11) and the strong coupling constantαs at next-to-leading order and next-to-next-to-leading ord er (NNLO) in QCD based on world data…
Extended parameterisations for MSTW PDFs and their effect on lepton charge asymmetry from W decays
- Physics
- 2013
We investigate the effect of extending the standard MSTW parameterisation of input parton distribution functions (PDFs) using Chebyshev polynomials, rather than the usual expressions which involve a…
Heavy-quark mass dependence in global PDF analyses and 3- and 4-flavour parton distributions
- Physics
- 2010
We study the sensitivity of our recent MSTW 2008 NLO and NNLO PDF analyses to the values of the charm- and bottom-quark masses, and we provide additional public PDF sets for a wide range of these…
Parton Distributions: HERA-Tevatron-LHC
- Physics
- 2010
The parton distribution functions (PDFs) are a non-negotiable input to almost all theory predictions at hadron colliders. In this talk, I introduce PDF determination by global analysis and discuss…
Parton distributions in the LHC era: MMHT 2014 PDFs
- PhysicsThe European physical journal. C, Particles and fields
- 2015
These MMHT2014 PDFs supersede the ‘MSTW2008’ parton sets, but they are obtained within the same basic framework and include a variety of new data sets, from the LHC, updated Tevatron data and the HERA combined H1 and ZEUS data on the total and charm structure functions.
References
SHOWING 1-10 OF 172 REFERENCES
Uncertainties of predictions from parton distributions II: theoretical errors
- Physics
- 2004
Abstract.We study the uncertainties in parton distributions, determined in global fits to deep inelastic and related hard scattering data, due to so-called theoretical errors. Amongst these, we…
Stability of NLO global analysis and implications for Hadron collider physics
- Physics
- 2005
The phenomenology of Standard Model and New Physics at hadron colliders depends critically on results from global QCD analysis for parton distribution functions (PDFs). The accuracy of the standard…
Parton distributions for the LHC
- Physics
- 2007
AbstractWe present updated leading-order, next-to-leading order and next-to-next-to-leading order parton distribution functions (“MSTW 2008”) determined from global analysis of hard-scattering data…
Uncertainties of predictions from parton distributions I: Experimental errors
- Physics
- 2003
Abstract. We determine the uncertainties on observables arising from the errors on the experimental data that are fitted in the global MRST2001 parton analysis. By diagonalizing the error matrix we…
Uncertainties of predictions from parton distribution functions. I. The Lagrange multiplier method
- Physics
- 2001
We apply the Lagrange Multiplier method to study the uncertainties of physical predictions due to the uncertainties of parton distribution functions (PDFs), using the cross section for W production…
Fixed target Drell-Yan data and NNLO QCD fits of parton distribution functions
- Physics
- 2006
We discuss the influence of fixed-target Drell-Yan data on the extraction of parton distribution functions at next-to-next-to-leading order (NNLO) in QCD. When used in a parton distribution fit, the…
Parton distributions from deep-inelastic-scattering data
- Physics
- 2003
We perform the analysis of existing light-targets deep-inelastic-scattering data in the leading-order, next-to-leading-order, and next-to-next-to-leading-order (NNLO) QCD approximations and extract…
New generation of parton distributions with uncertainties from global QCD analysis
- Physics
- 2002
A new generation of parton distribution functions with increased precision and quantitative estimates of uncertainties is presented. This work signiflcantly extends previous CTEQ and other global…
An NLO QCD analysis of inclusive cross-section and jet-production data from the ZEUS experiment
- Physics
- 2005
The ZEUS inclusive differential cross-section data from HERA, for charged and neutral current processes taken with e(+) and e(-) beams, together with differential cross-section data on inclusive jet…