Results 91 to 100 of about 2,008 (184)

Global Fits of Parton Distributions [PDF]

, 2003
I discuss recent developments in the determination of parton distributions from global fits. I concentrate on the errors associated with these parton distributions and with the physical quantities which are determined in terms of them. I outline the various techniques used to quantify the uncertainties due to errors on experimental data used in the ...
openaire   +3 more sources

A quantitative study of two-loop splitting in double parton distributions

Journal of High Energy Physics
Double parton distributions at small distances between the two partons are dominated by a mechanism in which the two observed partons originate from the splitting of a single parton.
Markus Diehl, Peter Plößl
doaj   +1 more source

Evolution of colour correlated double parton distributions: a quantitative study

Journal of High Energy Physics
Double parton distributions satisfy the same evolution equations as ordinary single-parton densities, provided that the colours of the two partons are uncorrelated.
Markus Diehl, Florian Fabry, Peter Plößl   +2 more
doaj   +1 more source

Probing Spin Dependent Quark and Gluon Distributions Through Azimuthal and Polarization Asymmetries

EPJ Web of Conferences, 2016
Spin and transverse momentum dependent parton distributions - Generalized Parton Distributions, Transverse Momentum Distributions and related distributions - are at the interface between the QCD structure of the hadrons and observable quantities.
Goldstein Gary R., Liuti Simonetta
doaj   +1 more source

Nonperturbative evolution of parton quasi-distributions

Physics Letters B, 2017
Using the formalism of parton virtuality distribution functions (VDFs) we establish a connection between the transverse momentum dependent distributions (TMDs) F(x,k⊥2) and quasi-distributions (PQDs) Q(y,p3) introduced recently by X.
A.V. Radyushkin
doaj   +1 more source

Longitudinal and transverse parton momentum distributions for pion and nucleon within relativistic constituent quark models

EPJ Web of Conferences, 2010
Longitudinal and transverse quark momentum distributions for the pion and the nucleon are calculated from quark-hadron vertexes obtained by an investigat ion of electromagnetic form factors within relativistic constituent quark models. The no-helicity
Pasquini B., Frederico T., Pace E., Salmè G.   +3 more
doaj   +1 more source

Nuclear Parton Distributions with the LHeC

EPJ Web of Conferences, 2016
Nuclear parton distributions are far from being known today because of an infant experimental base. Based on design studies of the LHeC and using new simulations, of the inclusive neutral and charged current cross section measurements and of the strange,
Klein Max
doaj   +1 more source

LO, NLO, and NNLO parton distributions for LHC event generators

Journal of High Energy Physics
We present NNPDF4.0MC, a variant of the NNPDF4.0 set of parton distributions (PDFs) at LO, NLO and NNLO, with and without inclusion of the photon PDF, suitable for use with Monte Carlo (MC) event generators, which require PDFs to satisfy additional ...
Juan Cruz-Martinez, Stefano Forte, Niccolò Laurenti, Tanjona R. Rabemananjara, Juan Rojo   +4 more
doaj   +1 more source

Top-quark pole mass extraction at NNLO accuracy, from total, single- and double-differential cross sections for t t ¯ $$ t\overline{t} $$ + X production at the LHC

Journal of High Energy Physics
We extract the top-quark mass value in the on-shell renormalization scheme from the comparison of theoretical predictions for pp → t t ¯ $$ t\overline{t} $$ + X at next-to-next-to-leading order (NNLO) QCD accuracy with experimental data collected by the ...
M. V. Garzelli, J. Mazzitelli, S.-O. Moch, O. Zenaiev   +3 more
doaj   +1 more source

Exploring twist-4 chiral-even GPDs in the light-front quark-diquark model

Nuclear Physics B
In this work, we delve into the realm of quantum chromodynamics (QCD) by calculating twist-4 chiral-even generalized parton distributions (GPDs), within the context of the light-front quark-diquark model (LFQDM), focusing specifically on the intriguing ...
Shubham Sharma, Harleen Dahiya
doaj   +1 more source