Topic
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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CERN1
TL;DR: In this paper, the authors review the hadro-production data presently available on open charm and beauty absolute production cross-sections, collected by experiments at CERN, DESY and Fermilab.
129 citations
TL;DR: In this article, the authors apply parton-model concepts to the ''soft'' (smallmomentum transfer) processes which make up the majority of the hadronic total cross section.
Abstract: We apply parton-model concepts to the ''soft'' (small-momentum- transfer) processes which make up the majority of the hadronic total cross section. Diffraction is calculated as the shadow of these soft processes. We obtain an attractive picture of the essential features of total, elastic, and diffractive-inelastic scattering. In particular, the rather large cross section for inelastic diffraction, which is observed experimentally, results from fluctuations in the distribution of the wee partons which initiate interactions. These fluctuations lead to diffractive production by the mechanism of Good and Walker. The observed peripheral character of diffraction as a function of impact parameter, the absence of a forward dip in dsigma/dt dm/sup 2/, the correct integrated cross section, and the correct small-t slope of diffraction all follow naturally in our approach.
129 citations
TL;DR: In this paper, the nuclear parton distributions are given in a model where the nucleus is viewed as a collection of uncorrelated nucleons, and the effect of nuclear shadowing goes away very slowly when Q2 increases.
129 citations
TL;DR: In this paper, a new global fit to deep-inelastic and related data is presented, which finds a gluon distribution which is larger for $x \lapproxeq 0.01$ and smaller for$x \sim 0.1$ and a flatter input sea quark distribution.
Abstract: The latest measurements of $F_2$ at HERA allow for a {\it combination} of gluon and sea quark distributions at small $x$ that is significantly different from those of existing parton sets. We perform a new global fit to deep-inelastic and related data. We find a gluon distribution which is larger for $x \lapproxeq 0.01$, and smaller for $x \sim 0.1$, and a flatter input sea quark distribution than those obtained in our most recent global analysis. The new fit also gives $\alpha_s(M_Z^2) = 0.114$. We study other experimental information available for the gluon including, in particular, the constraints coming from fixed-target and collider prompt $\gamma$ production data.
129 citations
TL;DR: In this article, the exclusive photoproduction of a heavy timelike photon which decays into a lepton pair was investigated, and the authors argued that the two processes are complementary for studying generalized parton distributions in the nucleon.
Abstract: We investigate the exclusive photoproduction of a heavy timelike photon which decays into a lepton pair, $\gamma p\to \ell^+\!\ell^- p$
. This can be seen as the analog of deeply virtual Compton scattering, and we argue that the two processes are complementary for studying generalized parton distributions in the nucleon. In an unpolarized experiment the angular distribution of the leptons readily provides access to the real part of the Compton amplitude. We estimate the possible size of this effect in kinematics where the Compton process should be dominated by quark exchange.
129 citations