Showing papers on "Parton published in 1974"
TL;DR: In this article, a strongly interacting particle is a finite region of space to which fields are confined, and the confinement is accomplished in a Lorentz-invariant way by endowing the finite region with a constant energy per unit volume, $B$.
Abstract: We propose that a strongly interacting particle is a finite region of space to which fields are confined. The confinement is accomplished in a Lorentz-invariant way by endowing the finite region with a constant energy per unit volume, $B$. We call this finite region a "bag." The contained fields may be either fermions or bosons and may have any spin; they may or may not be coupled to one another. Equations of motion and boundary conditions are obtained from a variational principle. The confining region has no dynamical freedom but constrains the fields inside: There are no excitations of the coordinates determining the confining region. The model possesses many desirable features of hadron dynamics: (i) a parton interpretation and presumably Bjorken scaling; the confined fields are free or weakly interacting except close to the boundary; (ii) infinitely rising Regge trajectories as a consequence of the bag's finite extent; (iii) the Hagedorn degeneracy or limiting temperature; (iv) all physical hadrons are singlets under hadronic gauge symmetries. For example, in a theory of fractionally charged, "colored" quarks interacting with colored, massless gauge vector gluons, if both quark and gluon fields are confined to the bag, only color-singlet solutions exist. In addition to establishing these general properties, we present complete classical and quantum solutions for free scalars and also for free fermions inside a bag of one space and one time dimension. Both systems have linear mass-squared spectra. We demonstrate Poincar\'e invariance at the classical level in any dimension and at the quantum level for the above-mentioned explicit solutions in two dimensions. We discuss the behavior of specific solutions in one and three space dimensions. We also discuss in detail the problem of fermion boundary conditions, which follow only indirectly from the variational principle.
1,888 citations
TL;DR: In this paper, a sum rule for the asymmetry in deepinelastic scattering of polarized electrons from polarized protons was derived from the quark light-cone algebra and the assumption that strange quarks do not contribute to the asymmetric scattering.
Abstract: A sum rule is derived for the asymmetry in deep-inelastic scattering of polarized electrons from polarized protons: ∫01dξgep(ξ)≈0.15gA. The result follows from the quark light-cone algebra and the assumption that strange quarks do not contribute to the asymmetry. The latter is justified by conventional parton-model arguments.
325 citations
TL;DR: In this paper, it is argued that in vector gauge theories it is possible to have the short-distance and light-cone behavior of quark fields without real quark production in deep-inelastic reactions.
Abstract: This paper is addressed to the question of why isolated quark partons are not seen. It is argued that in vector gauge theories it is possible to have the short-distance and light-cone behavior of quark fields without real quark production in deep-inelastic reactions. The physical mechanism involved is the flow of vacuum-polarization currents which neutralize any outgoing quarks. Our ideas are inspired by arguments due to Schwinger and an intuitive picture of Bjorken. Two-dimensional (1 space, 1 time) vector gauge field theories provide exactly soluble examples of this phenomenon. The resulting picture of deep-inelastic final states predicts jets of hadrons and logarithmically rising multiplicities as conjectured by Bjorken and Feynman.
213 citations
TL;DR: In this paper, the nucleon is described as a bound state of three quarks in the p → ∞ frame, and the constituent quarks have themselves a structure suggested by the quark gluon parton model.
123 citations
TL;DR: In this paper, a complete list of quarkparton model relations among deep inelastic lepton-nucleon scattering processes is given, to be compared with forthcoming neutrino and anti-neutrino data.
99 citations
CERN1
TL;DR: In this paper, the authors show that the current quarks generated by this transformation cannot be identified with quark partons and the properties of a more general operator which is a candidate for such a transformation are discussed.
71 citations
TL;DR: This article showed that when final state interactions are added to the parton model Drell-Yan formula for massive lepton pair production, they do not change the cross-section of the lepton.
58 citations
TL;DR: In this article, the amplitudes for annihilation of two virtual photons into hadron resonances and continuum states were systematically studied, and definite predictions for inclusive two-photon annihilation were derived by the same methods.
49 citations
TL;DR: In this paper, a number of constraints, several new, are exploited to obtain realistic quark parton distributions for baryons and mesons, and these distributions are used to make detailed predictions for NN or π N → l + l − + anything, potentially providing a quantitative test of the quark Parton model.
45 citations
TL;DR: In this article, the information available about nonelectromagnetic lepton interactions in experiments which are relatively insensitive to the loop structure of the underlying theory is considered and experiments which would clarify the role of exotic interactions are proposed and discussed.
Abstract: We consider the information available about nonelectromagnetic lepton interactions in experiments which are relatively insensitive to the loop structure of the underlying theory. Further experiments which would clarify the role of exotic interactions are proposed and discussed.
TL;DR: In this paper, a non-trivial Melosh transformation between constituent and current quarks is applied to the calculation of matrix elements for nucleon to resonance transitions induced by arbitrary currents belonging to an octet.
TL;DR: In this article, deep inelastic (charged and neutral current) neutrino processes are analyzed using parton distributions obtained previously from eN in elastic reactions, and sizeable production of “charmed” hadrons is predicted in charged current processes at asymptotic energy.
TL;DR: In this article, the negative sign of the mean square charge radius of the neutron was analyzed in terms of the transverse momentum distribution of partons, motivated by recent measurements on electroproduction.
TL;DR: In this article, a simple bound state model of the π 0 particle is introduced in terms of two charged valence partons in a 1 S state, which is used to assess the physical relevance of each of the above assumptions, leaving as possible alternative for an exact formulation a selection between the weak and the strong assumptions.
TL;DR: In this paper, the idea of local duality between generalized vector dominance and light cone algebra or parton model is applied to the propagator of vector currents and a set of sum rules reminiscent of the generalized first Weinberg sum rules but involving certain unknown parameters are derived.
Journal Article•
TL;DR: In this paper, it was shown that M 3 and the longitudinal structure function M L both scale and are independent of the vector-dominant hadronic structure of the real photon.
TL;DR: In this paper, the possibility of observing weak neutral currents in the inclusive production of ordinary lepton pairs in high-energy proton-proton collisions was discussed, where the weak interaction was considered to be mediated by a neutral vector boson and calculations were done in the parton model.
TL;DR: In this article, the logarithmic violations of scaling in the canonical gauge field theory of colored quarks and gluons are investigated and upper bounds for the quark-gluon coupling constant are derived.
TL;DR: In this paper, it was shown that when final state interactions are added to the parton model (Drell-Yan) formula for massive lepton pair production, the cross sections decreases.
TL;DR: A semi-empirical mass formula of a particular parton model, in which it is assumed that partons are highly charged, requires the existence of a new class of hadrons, at least one of which must be absolutely stable and whose masses are of the order of a few GeV as discussed by the authors.
TL;DR: In this article, the experimental results on the neutral current reactions ν μ + hadrons are compared with the expectations of the Weinberg-Salam theory as calculated in a parton model.