Zobrazeno 1 - 10
of 416
pro vyhledávání: '"Roberts, R G"'
I outline some of the most recent developments on the global fit to parton distributions performed by the MRST collaboration.
Comment: 6 pages, 7 figures. To appear in proceedings of XIII International Workshop on Deep Inelastic Scattering, Apri
Comment: 6 pages, 7 figures. To appear in proceedings of XIII International Workshop on Deep Inelastic Scattering, Apri
Externí odkaz:
http://arxiv.org/abs/hep-ph/0507015
Publikováno v:
Eur.Phys.J.C39:155-161,2005
We perform a global parton analysis of deep inelastic and related hard-scattering data, including ${\cal O}(\alpha_{\rm QED})$ corrections to the parton evolution. Although the quality of the fit is essentially unchanged, there are two important phys
Externí odkaz:
http://arxiv.org/abs/hep-ph/0411040
Publikováno v:
Phys.Lett.B604:61-68,2004
We propose a more physical parameterization of the gluon distribution for global parton analyses of deep inelastic and related hard scattering data. In the new parameterization the gluon distribution at large x in the MSbar-scheme is driven by the va
Externí odkaz:
http://arxiv.org/abs/hep-ph/0410230
I present a brief summary of the most important updates in the MRST determinations of the NLO and NNLO parton distributions. I concentrate on uncertainties due to input assumptions and possible theoretical corrections, particularly isospin violation,
Externí odkaz:
http://arxiv.org/abs/hep-ph/0407311
Publikováno v:
Eur.Phys.J.C35:325-348,2004
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 include potential errors due to the change of perturbative order
Externí odkaz:
http://arxiv.org/abs/hep-ph/0308087
We discuss uncertainties in the extraction of parton distributions from global analyses of DIS and related data. We present conservative sets of partons, at both NLO and NNLO, which are stable to x,Q^2,W^2 cuts on the data. We give the corresponding
Externí odkaz:
http://arxiv.org/abs/hep-ph/0307262
Publikováno v:
Eur.Phys.J.C28:455-473,2003
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 produce sets of partons suitable for use within the framework
Externí odkaz:
http://arxiv.org/abs/hep-ph/0211080
The interplay between Sudakov resummation, renormalons and higher twist in deep inelastic scattering
Autor:
Gardi, E., Roberts, R. G.
Publikováno v:
Nucl.Phys. B653 (2003) 227-255
We claim that factorization implies that the evolution kernel, defined by the logarithmic derivative of the N-th moment of the structure function d ln F_2^N / d ln Q^2, receives logarithmically enhanced contributions (Sudakov logs) from a single sour
Externí odkaz:
http://arxiv.org/abs/hep-ph/0210429
Publikováno v:
Acta Phys.Polon. B33 (2002) 2927-2932
We discuss the latest update of the MRST parton distributions in response to the most recent data. We discuss the areas where there are hints of difficulties in the global fit, and compare to some other updated sets of parton distributions, particula
Externí odkaz:
http://arxiv.org/abs/hep-ph/0207067