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Parton
About: Parton is a research topic. Over the lifetime, 13484 publications have been published within this topic receiving 368877 citations.
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TL;DR: In this paper, the evolution of the eight leading-twist transverse momentum dependent parton distribution functions is discussed, which turns out to be universal and spin independent, by using the highest order perturbatively calculable ingredients at their disposal, thus obtaining an expression for the kernel with highly reduced model dependence.
Abstract: We discuss the evolution of the eight leading-twist transverse momentum dependent parton distribution functions, which turns out to be universal and spin independent. By using the highest order perturbatively calculable ingredients at our disposal, we perform the resummation of the large logarithms that appear in the evolution kernel of transverse momentum distributions up to next-to-next-to-leading logarithms (NNLL), thus obtaining an expression for the kernel with highly reduced model dependence. Our results can also be obtained using the standard CSS approach when a particular choice of the b
∗ prescription is used. In this sense, and while restricted to the perturbative domain of applicability, we consider our results as a “prediction” of the correct value of b
max which is very close to 1.5 GeV−1. We explore under which kinematical conditions the effects of the non-perturbative region are negligible, and hence the evolution of transverse momentum distributions can be applied in a model independent way. The application of the kernel is illustrated by considering the unpolarized transverse momentum dependent parton distribution function and the Sivers function.
170 citations
TL;DR: In this article, the one-loop matching condition for nonsinglet quark distributions in the transverse-momentum cutoff scheme, including unpolarized, helicity and transversity distributions, was derived.
Abstract: We derive the one-loop matching condition for nonsinglet quark distributions in the transverse-momentum cutoff scheme, including unpolarized, helicity and transversity distributions. The matching is between the quasidistribution defined by static correlation at finite nucleon momentum and the light-cone distribution measurable in experiments. The result is useful for extracting the latter from the former in a lattice QCD calculation which uses the lattice spacing as the ultraviolet cutoff.
170 citations
TL;DR: In this article, it was shown that parton saturation may have started to set in central heavy ion collisions already around the highest CERN SPS energy, and made predictions based on high density QCD for the forthcoming 22$ GeV run at RHIC.
Abstract: The experimental results on hadron production obtained recently at RHIC offer a new prospective on the energy dependence of the nuclear collision dynamics. In particular, it is possible that parton saturation---the phenomenon likely providing initial conditions for the multiparticle production at RHIC energies---may have started to set in central heavy ion collisions already around the highest CERN SPS energy. We examine this scenario, and make predictions based on high density QCD for the forthcoming $\sqrt{s}=22$ GeV run at RHIC.
170 citations
Michigan State University1, University of Oxford2, Southern Methodist University3, Thomas Jefferson National Accelerator Facility4, College of William & Mary5, VU University Amsterdam6, Hampton University7, University of Cyprus8, The Cyprus Institute9, University of Pavia10, National Taiwan Ocean University11, University of Regensburg12, Temple University13, New Mexico State University14, Los Alamos National Laboratory15, University College London16, Shanghai Jiao Tong University17, University of Kentucky18, University of Virginia19, University of Washington20, University of Grenoble21, University of Tübingen22, University of Mainz23, University of Adelaide24
TL;DR: In this article, the authors present an overview of lattice-QCD and global-analysis techniques used to determine unpolarized and polarized proton PDFs and their moments.
170 citations
TL;DR: The two-photon exchange contribution to elastic electron-proton scattering at large momentum transfer through the scattering off a parton in the proton is estimated and related to the generalized parton distributions which appear in hard exclusive processes.
Abstract: We estimate the two-photon exchange contribution to elastic electron-proton scattering at large momentum transfer through the scattering off a parton in the proton. We relate the two-photon exchange amplitude to the generalized parton distributions which appear in hard exclusive processes. We find that when taking the polarization transfer determinations of the form factors as input, adding in the 2-photon correction does reproduce the Rosenbluth cross sections.
170 citations