Results 51 to 60 of about 73,038 (193)

Polarized parton distribution functions reexamined [PDF]

Physical Review D, 1996
17 pages, 9 figures. Main changes: (i) all polarized parton distributions are parametrized and determined in the MS scheme, (ii) all figures are ...
Cheng, Hai-Yang, Liu, Hung Hsiang, Wu, Chung-Yi   +2 more
openaire   +3 more sources

Parton Distributions

, 2009
We provide an assessment of the state of the art in various issues related to experimental measurements, phenomenological methods and theoretical results relevant for the determination of parton distribution functions (PDFs) and their uncertainties, with the specific aim of providing benchmarks of different existing approaches and results in view of ...
Dittmar, M., Forte, S., Glazov, A., Moch, S., Altarelli, G., Anderson, J., Ball, R. D., Beuf, G., Boonekamp, M., Burkhardt, H., Caola, F., Ciafaloni, M., Colferai, D., Cooper-Sarkar, A., de Roeck, A., Del Debbio, L., Feltesse, J., Gelis, F., Grebenyuk, J., Guffanti, A., Halyo, V., Latorre, J. I., Lendermann, V., Li, Gang, Motyka, L., Petersen, T., Piccione, A., Radescu, V., Rogal, M., Rojo, J., Royon, C., Salam, G. P., Salek, D., Stasto, A. M., Thorne, R. S., Ubiali, M., Vermaseren, J. A. M., Vogt, A., Watt, G., White, C. D.   +39 more
openaire   +4 more sources

Parton recombination effect in polarized parton distributions

, 2004
Parton recombination corrections to the standard spin-dependent Altarelli-Parisi evolution equation are considered in a nonlinear evolution equation. The properties of this recombination equation and its relation with the spin-averaged form are discussed.
Abramovsky, Altarelli, Badelek, Gribov, Jianhong Ruan, Lampe, Mueller, Wei Zhu, Zhenqi Shen, Zhu, Zhu, Zhu, Zhu, Zhu   +13 more
core   +1 more source

Parton distributions of the proton [PDF]

Physical Review D, 1994
preprint DTP/94/34, 26 pages, 21 figures (not included, available on request)
Martin, A. D., Roberts, R. G., Stirling, W. J.   +2 more
openaire   +3 more sources

Covariant extension of the GPD overlap representation at low Fock states

European Physical Journal C: Particles and Fields, 2017
We present a novel approach to compute generalized parton distributions within the lightfront wave function overlap framework. We show how to systematically extend generalized parton distributions computed within the DGLAP region to the ERBL one ...
N. Chouika, C. Mezrag, H. Moutarde, J. Rodríguez-Quintero   +3 more
doaj   +1 more source

Generalized parton correlation functions for a spin-1/2 hadron

, 2009
The fully unintegrated, off-diagonal quark-quark correlator for a spin-1/2 hadron is parameterized in terms of so-called generalized parton correlation functions.
A. Bacchetta ., A.D. Martin, Andreas Metz, FP420 R, HERMES collaboration, J. Collins, J.C. Collins, J.C. Collins, Marc Schlegel, S. Meißner, S. Meißner, Stephan Meißner   +11 more
core   +1 more source

On positivity of parton distributions [PDF]

, 1998
We discuss the bounds on polarized parton distributions which follow from their definition in terms of cross section asymmetries. We spell out how the bounds obtained in the naive parton model can be derived within perturbative QCD at leading order when ...
Altarelli, Guido, Forte, Stefano, Ridolfi, Giovanni   +2 more
core   +2 more sources

Two-loop splitting in double parton distributions: the colour non-singlet case

Journal of High Energy Physics, 2021
At small inter-parton distances, double parton distributions receive their dominant contribution from the splitting of a single parton. We compute this mechanism at next-to-leading order in perturbation theory for all colour configurations of the ...
M. Diehl, J. R. Gaunt, P. Plößl
doaj   +1 more source

Photon Generalized Parton Distributions

, 2011
We present a calculation of the generalized parton distributions of the photon using overlaps of photon light-front wave functions.Comment: Talk given at LightCone 2011, 4 pages, 3 ...
A.V. Belitsky, Asmita Mukherjee, D. Chakrabarti, J.P. Ralston, K. Goeke, M. Burkardt, M. Diehl, R. Manohar, S. Boffi, S. Friot, S.J. Brodsky, S.J. Brodsky, Sreeraj Nair   +12 more
core   +1 more source

The Kaon Off-Shell Generalized Parton Distributions and Transverse Momentum Dependent Parton Distributions

Particles
We investigate the off-shell generalized parton distributions (GPDs) and transverse momentum dependent parton distributions (TMDs) of kaons within the framework of the Nambu–Jona-Lasinio model, employing proper time regularization.
Jin-Li Zhang
doaj   +1 more source