Results 11 to 20 of about 5,029 (187)

Double parton distributions out of bounds in colour space

open access: yesEuropean Physical Journal C: Particles and Fields, 2021
We investigate the positivity of double parton distributions with a non-trivial dependence on the parton colour. It turns out that positivity is not preserved by leading-order evolution from lower to higher scales, in contrast to the case in which parton
M. Diehl   +3 more
doaj   +1 more source

On sum rules for double and triple parton distribution functions and Pythia’s model of multiple parton interactions

open access: yesJournal of High Energy Physics, 2023
Multi-parton distributions in a proton, the nonperturbative quantities needed to make predictions for multiple scattering rates, are poorly constrained from theory and data and must be modelled.
Oleh Fedkevych, Jonathan R. Gaunt
doaj   +1 more source

The multidimensional nucleon structure

open access: yesEPJ Web of Conferences, 2016
We discuss different kinds of parton distributions, which allow one to obtain a multidimensional picture of the internal structure of the nucleon.
Pasquini Barbara, Lorcé Cédric
doaj   +1 more source

Sum rule improved double parton distributions in position space

open access: yesEuropean Physical Journal C: Particles and Fields, 2020
Models for double parton distributions that are realistic and consistent with theoretical constraints are crucial for a reliable description of double parton scattering.
M. Diehl   +4 more
doaj   +1 more source

Exclusive double quarkonium production and generalized TMDs of gluons

open access: yesPhysics Letters B, 2022
Being the “mother distributions” of all types of two-parton correlation functions, generalized transverse momentum dependent parton distributions (GTMDs) have attracted a lot of attention over the last years.
Shohini Bhattacharya   +4 more
doaj   +1 more source

Nuclear parton distributions

open access: yesEPJ Web of Conferences, 2017
We review a microscopic model of the nuclear parton distribution functions, which accounts for a number of nuclear effects including Fermi motion and nuclear binding, nuclear meson-exchange currents, off-shell corrections to bound nucleon distributions ...
Kulagin S. A.
doaj   +1 more source

T-odd generalized and quasi transverse momentum dependent parton distribution in a scalar spectator model

open access: yesEuropean Physical Journal C: Particles and Fields, 2020
Generalized transverse momentum dependent parton distributions (GTMDs), as mother funtions of transverse momentum dependent parton distributions (TMDs) and generalized parton distributions (GPDs), encode the most general parton structure of hadrons.
Xuan Luo, Hao Sun
doaj   +1 more source

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

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

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

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