Showing papers on "Parton published in 1973"
TL;DR: The parton theory is developed along several lines as mentioned in this paper, and the Galilean analogy is worked out and the use of non-relativistic reasoning in relativistic contexts is illustrated Applications of infinite momentum quantum mechanics include the computation of the radius of a relatvistic bound state, space time visualization of the multi-peripheral model, and the eikonal approach to high energy scattering.
141 citations
TL;DR: In this article, it is argued that gauge theories can have the light-cone behavior of quark fields without quark production in deep-inelastic reactions, and illustrated in the exact solution of quantum electrodynamics in one space and one time dimension.
Abstract: We suggest a solution to the question of why isolated quark-partons are not observed. It is argued that gauge theories can have the light-cone behavior of quark fields without quark production in deep-inelastic reactions. Our ideas are illustrated in the exact solution of quantum electrodynamics in one space and one time dimension. The theory's crucial physical property is the extreme polarizability of its vacuum. Predictions for deep inelastic final states are presented. (auth)
127 citations
TL;DR: In this paper, two-photon processes in colliding e ± e − beam reactions were studied, with the aim of testing the parton model, and it was shown that parton contributions dominate in certain well defined kinematical limits, and provide an essential difference between photonic and hadronic processes.
115 citations
TL;DR: In this paper, the authors discuss algebraic structure of the quark model, algebraic analysis of quark models, and algebraic properties of the parton model of the model.
84 citations
TL;DR: In this article, the authors draw attention to hadron collisions from cosmic-ray data showing evidence for high transversemomentum secondaries in substantial excess of the celebrated exponential cutoff, analogous to recent observations at the CERN intersecting storage rings.
Abstract: ABS>We draw attention to hadron collisions from cosmic-ray data showing evidence for high--transverse-momentum secondaries in substantial excess of the celebrated exponential cutoff, analogous to recent observations at the CERN intersecting storage rings. The data support a composite (parton/quark) picture of the proton in which deep inelastic proton collisions at high energy (~ 10/sup 3/ GeV) produce constituents, observed through hadron jets. This phenomenon is possibly connected to the rise of the total cross section observed in the same range of energy. (auth)
75 citations
TL;DR: In this article, the quark parton model is applied to the deepinelastic region of single-particle inclusive lepton-hadron processes, and various conclusions concerning experimentally observable quantities such as singleparticle distribution functions and average multiplicities are reached.
46 citations
TL;DR: In this paper, the Kuti-Weisskopf quarkparton model was modified to obtain agreement with recent experimental and theoretical results, at the cost of sacrificing some simplicity.
Abstract: We attempt to modify the Kuti-Weisskopf quark-parton model so as to obtain agreement with recent experimental and theoretical results. We find that, at the cost of sacrificing some simplicity, reasonable phenomenological fits can be obtained. (auth)
29 citations
TL;DR: In this paper, it was shown that there should be no dependence on the azimuthal angle in the cross section for deep inelastic, semi-inclusive electroproduction with one detected hadron in the final state.
24 citations
TL;DR: The anomalous dimension of the fundamental field is connected to the anomalous dimensions of the high spin bilinear operators as discussed by the authors, which can be determined by examining the violations of the Bjorken scaling law in deep-inelastic electron-proton scattering.
20 citations
TL;DR: In this paper, the transverse momentum of the cores is estimated to be 5 GeV/c for parton-parton collisions at NAL and CERN ISR.
Abstract: Multiple-core production in hadron-hadron collisions directly measures (in the context of the parton model) differential cross sections for parton-parton collisions. To obtain \ensuremath{\sim}20% accuracy in reconstruction of the parton-parton kinematics requires transverse momentum of the cores \ensuremath{\gtrsim} 5 GeV/c. Experiments at NAL as well as the CERN ISR appear feasible. What might be learned from such studies is discussed.
20 citations
TL;DR: In this paper, the Weinberg renormalizable theory of weak and electromagnetic interactions and its simple extension to hadron interactions are applied to a simple parton model, and the partons are neglected.
TL;DR: In this article, it was shown that the cross sections fall as a power of pT as expected from point-like interactions of the hadrons, similar to those observed in electroproduction experiments.
TL;DR: The average multiplicity in deep inelastic electro-and neutrinoproduction at large ω(ω∼s/Q2 + 1) is related in Feynman's version of the parton model to the average multiplicities in high-energy electron-positron annihilation and hadron-hadron scattering as mentioned in this paper.
TL;DR: In this paper, the predictions of the quark-parton model for hadronic charge ratios in the current-fragmentation region in lepton-induced reactions were investigated, using parton distribution functions given by the authors.
Abstract: We investigaie the predictions of the quark-parton model for hadronic charge ratios in ihe current-fragmentation region in inclusive lepton-induced reactions. We use parton distribution functions given by please delete the above abstract no. 22528====
TL;DR: In this paper, the authors apply general constraints of duality to deep-inelastic structure functions in a systematic manner, in analogy with hadronic duality, admit two components: one being constrained to non-exotic SU3 representations in two channels simultaneously, the other being a generalization of the pomeron effect.
TL;DR: In this article, it is shown how more sophisticated versions of the parton model can replace the naive expectation of final state hadrons being produced in ep or e+e− collisions in two jets of finite multiplicity, with a picture that permits the rapidity gap to be filled in and allows the multiplicity to rise with energy, even up to the limit imposed by energy conservation.
TL;DR: In this article, a bound state description of hadrons is attempted using an interacting local spinor field to obtain an early onset of scaling, this field is required to have sizeable matrix elements at relatively low energies and thus should carry conventional quantum numbers.
TL;DR: Using an approximate version of the quark parton model in conjunction with electron scattering data, this paper derived the number density functions for neutrino and antineutrino scattering from protons and neutrons in a domain which excludes the small-x region.
CERN1
TL;DR: Within the quark parton model the two-component duality idea is generalized to single hadron inclusive distributions in deep-inelastic scattering in this paper, and relations as well as inequalities among the structure functions are obtained.
TL;DR: In this article, the divergent pieces of the Cottingham expression for electromagnetic mass shifts are identified by means of structure-function sum rules, with the contributions (to the total mass shift) resulting from divergent electromagnetic masses shifts and propagator renormalization of the bare partons themselves.
Abstract: We show that the divergent pieces of the Cottingham expression for electromagnetic mass shifts may always be identified, by means of structure-function sum rules, with the contributions (to the total mass shift) resulting from the divergent electromagnetic mass shifts and propagator renormalization of the bare partons themselves. This enables one to carry out a renormalization program, to first order in $\ensuremath{\alpha}$. The SU(3) and electromagnetic mass shifts of the baryon octet are analyzed and shown to display a substantial consistency with one another. Predictions for fixed poles in the Compton amplitudes of all baryons result once that for the proton is known. In addition we extract quark masses for a given value of the $\ensuremath{\pi}\ensuremath{-}N \ensuremath{\sigma}$ term.
CERN1
TL;DR: In this paper, a mixed symmetry scheme for the valence component of the parton distributions was proposed to avoid the difficulty inherent in the symmetric valence quark model when applied to deep-inelastic scattering.
TL;DR: In this paper, it was shown that in naive parton models of this type one cannot avoid the appearance of isolated quark quantum numbers in the final state, regardless of the size of the parton.
Abstract: Bjorken and Feynman have suggested a quark-parton-model approach to predicting the final-state hadron spectra in deep-inelastic processes. Since the final-state interaction in their approach is characterized by short-range correlations in rapidity, it is natural to ask whether parton models with final-state interactions based on conventional multiperipheral dynamics might provide realizations of their picture. This is found to be untrue. We argue by studying perturbation-theory models (${\ensuremath{\varphi}}^{3}$ and cutoff vector-gluon ladder models) and by formulating a rather general intuitive space-time argument that in naive parton models of this type one cannot avoid the appearance of isolated-quark quantum numbers in the final state. In the $\ensuremath{\lambda}{\ensuremath{\varphi}}^{3}$ models the final-state interaction always vanishes in the deep-inelastic region (as well as in the high-energy annihilation region) regardless of the size of $\ensuremath{\lambda}$. In the vector-gluon model, the final-state interaction does not vanish asymptotically, but the struck quark parton cannot exchange its charge with the target fragments. The character of parton dynamics necessary to realize the Bjorken-Feynman picture is discussed.
TL;DR: In this paper, the parton model is re-expressed in terms of light-cone variables which achieves some simplification and gives some new results, in particular concerning the leading terms of the longitudinal structure function in the scaling limit for spin.
TL;DR: A photon interacting with a spin 0 pion will in the parton model couple to its spin 1 2 constituents, which has important implications for the elastic and transition form factors of the pion.
TL;DR: In this paper, the authors studied the processes e + N → e′ + h + anything, e+ + e− → h+ anything, within the parton model of Landshoff, Polkinghorne and Short.
TL;DR: In this article, predictions designed to test natural ideas based on SU(3) symmetry are derived for the processes e + + e − → h+ X and e + P → e + h + X in the quark parton model and bounds are obtained for these processes.
TL;DR: In this article, the authors investigated a quark-parton model for neutrino-nucleon scattering including a second-class axial vector current and found that the structure function W2 does not scale.
Abstract: We investigate a quark-parton model for neutrino-nucleon scattering including a second-class axial vector current. We find that in the presence of a second-class axial vector current the structure functionW2 does not scale. Although this result is based on the special form of this second-class current we conjecture that nonscaling is a characteristic feature of second-class currents.
TL;DR: In this article, the authors investigated single-particle electroproduction and photoproduction at large transverse momentum in a covariant parton model and showed that the constituent interchange diagrams are not gauge invariant to leading asymptotic order, and further diagrams necessary to obtain gauge invariance are discussed.
Abstract: Single-particle electroproduction and photoproduction at large transverse momentum are investigated in a covariant parton model. It is shown that the constituent interchange diagrams are not gauge invariant to leading asymptotic order, and the further diagrams necessary to obtain gauge invariance are discussed. The same diagrams are found to dominate in the asymptotic limit for both electroproduction with large or small photon momentum squared, and for photoproduction. In the model the processes are shown to have a power law fall-off in energy, with a remaining dependence on the relevant ratios of invariants, similar to the behaviour in hadronic cross-sections.
TL;DR: In this article, a model in which partons scatter diffractively from hadrons is suggested which gives excellent fits to real and virtual photoabsorption and to the rise in the total $\mathrm{pp}$ cross-section.
Abstract: A model in which partons scatter diffractively from hadrons is suggested which gives excellent fits to real and virtual photoabsorption and to the rise in the total $\mathrm{pp}$ cross-section. We discuss why a well-known sum rule diverges and show how it can be used to estimate ${F}_{2}(0)$.