Deep Inelastic Reactions Research Articles

Regge-muellervs. parton model analysis of deep inelastic reactions

The Regge-Mueller expansion of single-particle inclusive distributions in deep inelastic lepton-hadron scattering is matched with the ω → ∞ limit of the parton model description of the same reaction. Relations and inequalities among couplings and fragmentation functions, which appear also in purely hadronic reactions, are obtained.

On the mechanism of heavy ion collision leading to a compound system and to deep inelastic reactions

A model is presented that describes the dynamics of heavy ion collisions leading into the compound system. By indluding an anisotropic friction and using folding potentials it is able to reproduce most of the data on the compound formation cross-section. In addition. In addition the qualitative features of deep inealastic direct reaction appears in a natural way.

Vacuum Polarization and the Quark-Parton Puzzle

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)

Duality, the quark-parton model and inclusive pion electroproduction

There have been several a t tempts (1.2) to apply the consequences of dual i ty in deep inelastic interactions of hadrons with the weak and electromagnetic currents. In the work of LANDSHOFF and POLKINGHORNE (1) and in ref. (2), the Harar i -Freund (3) twocomponent dual i ty idea and pos i t iv i ty constraints have been applied to the imaginary par t of the forward current-nucleon amplitudes. I t has been realized (2) tha t the internal symmet ry propert ies of the structure functions can be reduced to those of a quarkpar ton model with the quark-par ton diagrams interpreted as dual i ty diagrams (4). In such a model (5) the quark distr ibution within a nucleon is divided into two components: the neutral component ((~ sea ~ quarks) corresponding to the pomeron background par t of the ampli tude, and the quantum-number-carrying component ((~ valence ,~ quarks) which corresponds to the Regge-resonance component. I t is a typical dual i ty element to assume separate posi t iv i ty for these (2), a proper ty which is not implied in a mere par ton approach. This enables one to obtain t ight bounds on the neutrino structure functions by using experimental da ta of the electromagnetic ones. The measurement of single hadron distr ibutions in deep inelastic reactions can serve as a useful tool for the understanding of the structure of the nucleon. Some general consequences following from symmet ry principles have been obtained by LIP~I~ and PASCH0S (~) for the target fragmentat ion region. The light-cone approach has been applied to this region (v), while the pa t ton model has been applied to both this region

A Model of Weak Interaction Based on the Three-Triplet Model of Hadrons

Possible roles which the internal degrees of freedom in the three-triplet model of hadrons play in weak interactions are investigated. It is pointed out that, if we introduce a charged current Gρ,α(x) (ρ= index of Lorentz vector, α=1,…,4) of the so-called `double V-A' type which is a certain kind of charged current so extended as to carry the internal degrees of freedom contained in the three-triplet model, and assume that the weak interaction is HW=(G0/2√2)Gρ,α·G*ρ,α, then the |ΔI|=1/2 rule is derived for nonleptonic decays of ordinary hadrons (assumed to belong to the SU(3)''-singlet). The purely leptonic interaction obtained from HW contains `pseudo-diagonal' terms, (eνµ)(νµe) and (µνe)(νeµ), but not the so-called diagonal ones. From the semi-leptonic interaction one obtains four kinds of hadronic currents which couple to the electron-, muon-, (µνe)- and (eνµ)-currents, i.e., Wρ(e;x), Wρ(µ;x), Wρ(νeµ;x) and Wρ(νµe;x). These are different from each other, but, as far as one treats matrix elements between SU(3)''-singlet states, the former two of them give the same values and the latter two have no contributions under the assumption that the symmetry-breaking of strong interaction preserves the SU(3)''-symmetry. In this sense, the µ-e universality holds. Various observable effects expected from our HW are investigated, in which are included properties of charm-nonconserving interaction, magnitude of the structure functions of deep inelastic neutrino reactions and so on.

Application of duality principles to deep inelastic reactions

We apply general constraints of duality to deep-inelastic structure functions in a systematic manner. In analogy with hadronic duality we admit two components: one being constrained to non-exotic SU 3 representations in two channels simultaneously, the other being a generalization of the pomeron effect. Our results can be best interpreted in terms of a quark-parton model with the usual valence quarks and a sea of SU 3-singlet quark-antiquark pairs, and we reproduce the results of that model without having to deal with quarks explicitly. On the theoretical side we give a statement of exchange degeneracy on the light cone, and we are led to a speculative connection between the pomeron effect and the matrix elements of the quark kinetic-energy tensor.

Light-Cone Structures and Sum Rules as Seen in the Parton Dual-Resonance Model

We propose a simple and unique asymptotic symmetry scheme to incorporate spins, SU (3), $\mathrm{CPT}$ invariance, and the generalized Bose statistics into the parton dual-resonance model for deep-inelastic lepton-hadron reactions. The scheme embodies Harari-Rosner quark duality diagrams, adopts Chan-Paton SU (3)-symmetry factors, identifies Mandelstam, Bardakci, and Halpern's multiplicative quark model in the Bjorken limit, and generates Fritzsch and Gell-Mann's light-cone structures identically. The dynamical (parton-dual-resonance-model) approach is therefore unified with the symmetry (light-cone) approach, and the complementarity between these two is established. Light-cone sum rules are derived, and a new sum rule is suggested. As a further application of this scheme, we calculate the complete sets of bilocal light-cone structures occurring in the two-heavy-boson processes.

Scattering of light by light using electron-positron colliding beams

We discuss the process e−+e+→γ+hadrons. Using automodelity, vectorsmeson dominance and the parton model, we give an estimate of the deep-inelastic cross section, showing that it might be comparable to the cross section of the deep-inelastic reaction e−+e+→H+anything H being a singled-out hadron. Some of the one-meson contributions are calculated in the quark model.