Results 41 to 50 of about 73,038 (193)

Wigner Functions and Quark Orbital Angular Momentum

open access: yesEPJ Web of Conferences, 2015
Wigner distributions contain combined position and momentum space information of the quark distributions and are related to both generalized parton distributions (GPDs) and transverse momentum dependent parton distributions (TMDs).
Mukherjee Asmita   +2 more
doaj   +1 more source

Are Parton distributions positive? [PDF]

open access: yesNuclear Physics B - Proceedings Supplements, 1999
We show that the naive positivity conditions on polarized parton distributions which follow from their probabilistic interpretation in the naive parton model are reproduced in perturbative QCD at the leading log level if the quark and gluon distribution are defined in terms of physical processes. We show how these conditions are modified at the next-to-
Forte, Stefano   +2 more
openaire   +2 more sources

Measurement of double-parton scattering in inclusive production of four jets with low transverse momentum in proton-proton collisions at s $$ \sqrt{s} $$ = 13 TeV

open access: yesJournal of High Energy Physics, 2022
A measurement of inclusive four-jet production in proton-proton collisions at a center-of-mass energy of 13 TeV is presented. The transverse momenta of jets within |η| < 4.7 are required to exceed 35, 30, 25, and 20 GeV for the first-, second-, third ...
The CMS collaboration   +2347 more
doaj   +1 more source

Generalized parton distributions and double distributions for q q-bar pions [PDF]

open access: yes, 2002
We consider two simple covariant models for pions (one with scalar and the other with spin-1/2 constituents). Pion generalized parton distributions are derived by integration over the light-cone energy.
A. Mukherjee   +40 more
core   +2 more sources

Collinear and TMD distributions with dynamical soft-gluon resolution scale

open access: yesJournal of High Energy Physics
Soft-gluon resolution scales characterize parton branching Monte Carlo implementations of the evolution equations for parton distribution functions in Quantum Chromodynamics (QCD).
F. Hautmann   +4 more
doaj   +1 more source

Off-forward parton distributions and Shuvaev's transformations [PDF]

open access: yes, 2000
We review Shuvaev's transformations, that relate off-forward parton distributions (OFPDs) to so-called effective forward parton distributions (EFPDs). The latter evolve like conventional forward partons.
A. D. Martin   +26 more
core   +4 more sources

TMD parton distributions from parton showers [PDF]

open access: yesProceedings of XXVII International Workshop on Deep-Inelastic Scattering and Related Subjects — PoS(DIS2019), 2019
We present the determination of Transverse Momentum Dependent (TMD) parton distributions from Monte Carlo parton showers. We investigate the effective TMD distributions obtained from the PYTHIA8 and HERWIG6 parton showers and compare them to the TMD distributions determined within the Parton Branching method.
Schmitz, Melanie   +3 more
openaire   +3 more sources

Kaon and pion parton distributions

open access: yesEuropean Physical Journal C: Particles and Fields, 2020
Beginning with results for the leading-twist two-particle distribution amplitudes of $$\pi $$ π - and K-mesons, each of which exhibits dilation driven by the mechanism responsible for the emergence of hadronic mass, we develop parameter-free predictions ...
Z.-F. Cui   +8 more
doaj   +1 more source

Parton distributions [PDF]

open access: yes, 2004
I discuss our current understanding of parton distributions. I begin with the underlying theoretical framework, and the way in which different data sets constrain different partons, highlighting recent developments.
Dasu, S   +4 more
core  

Universality of the EMC Effect

open access: yes, 2005
Using effective field theory, we investigate nuclear modification of nucleon parton distributions (for example, the EMC effect). We show that the universality of the shape distortion in nuclear parton distributions (the factorisation of the Bjorken x and
Arndt   +45 more
core   +1 more source

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