Showing papers on "Parton published in 1979"
TL;DR: In this article, the Drell-Yan process and the Feynman xF differential cross-section were calculated in QCD retaining all terms up to order αs(Q2).
552 citations
TL;DR: In this paper, the Drell-Yan parton model for the high-energy process p+p→μ++μ−++X for dimuons with large invariant mass is studied in the case that the protons are polarized.
380 citations
TL;DR: In this article, the naive parton model can be modified to include the effects of QCD interactions to all orders in perturbation theory, which requires that the mass singularities in quark and gluon inclusive cross sections factor into universal functions.
317 citations
CERN1
TL;DR: In this article, a Lagrangian formulation of jet calculus is given, as a non-local theory in 1 + 1 dimensions to be solved in the tree approximation, and a new and easy way for measuring QCD-predictable anomalous dimensions is proposed.
262 citations
TL;DR: In this article, the authors report results on the reactions e+e−− → hadrons in the energy range 13 ⩽ Ecm ⌽ 31.6 GeV and compare them with qq jets described in the quarkparton model and with first-order QCD predictions including gluon emission (qqg jets).
192 citations
TL;DR: In this article, the authors consider semi-inclusive reactions involving one or two observed hadrons in the final state within the framework of perturbative QCD and define parton densities and fragmentation functions beyond the leading order in QCD in a physically motivated way.
189 citations
TL;DR: In this paper, the authors discuss the implications of perturbative QCD for the structure of jets in e + e − annihilation above 10 GeV c.m. energy and show that a strong asymmetry in the transverse momentum distribution in e+ e − → 2 jets originates from lowest order gluon bremsstrahlung; one jet broadens and the other does not.
178 citations
TL;DR: In this article, the neutrino energy range 30-200 GeV was investigated and the results were in agreement with the expectations of the quark parton model and QCD.
Abstract: We present results on charged current inclusive neutrino and antineutrino scattering in the neutrino energy range 30–200 GeV. The results include a) total cross-sections; b)y distributions; c) structure functions; and d) scaling violations observed in the structure functions. The results, as well as their comparison with the results of electron and muon inclusive scattering, are in agreement with the expectations of the quark parton model and QCD.
126 citations
TL;DR: Within the leading logarithmic approximation of QCD using a method by Lipatov, this paper derived generalized LipATov-Altarelli-Parisi equations for the m -parton distributions from which the jet calculus rules proposed recently by Konishi, Ukawa and Veneziano can be obtained.
115 citations
TL;DR: In this paper, a QCD model for leptoproduction of heavy quarks based on gluon dissociation is presented, and rates for charm and heavier quark production are calculated and inclusive distributions are compared with dimuon data.
CERN1
TL;DR: In this paper, the leading log radiative corrections to d δ /d y distributions and to suitably interpreted d ǫ /d x distributions are shown to be quark-mass independent.
TL;DR: In this article, the authors examined the parton model for the back-to-back cross-sections of hadron pairs with large transverse momenta and showed quantitatively that this cross section is determined directly by the hard scattering subprocesses, without being influenced by the internal momentum of the constituents.
Abstract: The inclusive cross section of hadron pairs produced back-to-back with large transverse momenta is examined in the parton model. It is shown quantitatively that this cross section is determined directly by the hard scattering subprocesses, without being influenced by the internal momentum of the constituents, even for transverse momenta of the order of 2–3 GeV/c. The predictions of the phenomenological quark-quark scattering model and of the quantum chromodynamics model for the back-to-back cross section are compared with recent Fermi-lab data. Predictions are made for the corresponding cross section at ISR-energies.
TL;DR: In this article, the distribution and mass spectrum of color-singlet clusters are given in the leading log approximation and the multiplicity of such singlets is also given in terms of the parton multiplicity.
TL;DR: In this article, the authors studied large-pT hadron production off nuclear targets in the framework of the QCD inspired parton model and interpreted the anomalous nuclear enhancement as being due to multiple scattering of partons.
TL;DR: In this paper, the quantum-chromodynamic predictions for production of large transverse-momentum lepton-antilepton pairs from scattering were derived for the case where the parton distribution is not involved.
Abstract: The quantum-chromodynamic predictions are computed for production of large-transverse-momentum lepton-antilepton pairs from $q\overline{q}$ scattering (which is relevant to ${\ensuremath{\pi}}^{\ensuremath{-}}p$ or $\overline{p}p$ collisions). A simple formula not involving the parton distributions is derived for two of the three coefficients describing the angular distribution.
TL;DR: Gluon bremsstrahlung,q→Gq, and quark pair production from gluons,laggy, in deep inelastic reactions is investigated in the Breit frame as discussed by the authors.
Abstract: Gluon bremsstrahlung,q→Gq, and quark pair production from gluons,laggy, in deep inelastic reactions is investigated in the Breit frame (moving alongQ in the laboratory). These QCD effects diminish the overall forward momentum. There are also events with asingle largep⊥ forward jet. One spectacular class of events is predicted in which no forward going hadrons emerge, in the Breit frame. These effects are not mimicked by nonperturbative (limitedp⊥) parton jets at large but attainableQ2.
TL;DR: In this paper, features of the lepton angular distributions due to hard parton sub-processes in lepton-pair production at relatively large q are studied and compared with those derived from the Drell-Yan mechanism.
TL;DR: In this article, the authors present an extension to large transverse momentum and large mass models with the purpose of producing large-scale production on NUCLEAR TARGETs.
TL;DR: In this paper, the authors studied the production of charged and neutral pions by longitudinally polarized protons in the framework of a hard-scattering model based on perturbative quantum chromodynamics.
Abstract: We discuss predictions for the asymmetry ${A}_{\mathrm{LL}}$ in the inclusive production at large ${p}_{T}$ of charged and neutral pions by longitudinally polarized protons. We work in the framework of a hard-scattering model based on perturbative quantum chromodynamics. Various assumptions for the distribution of the proton's spin among its constituents---quarks, ocean antiquarks, and gluons---and the effects of scaling violations on the parton distributions are considered.
TL;DR: In this article, multiquark structure functions for the proton have been formulated assuming a statistical distribution of sea partons as in the Kuti-Weisskopf model and an alternative form for the recombination function was obtained by imposing a cutoff on the rapidity gap of combining quarks.
Abstract: Multiquark structure functions for the proton have been formulated assuming a statistical distribution of sea partons as in the Kuti-Weisskopf model. An alternative form for the recombination function has been obtained by imposing a cutoff on the rapidity gap of combining quarks. These multiquark structure functions and the recombination function have been used, within the framework of the recombination model of Das and Hwa, to discuss single-meson inclusive distributions, in the fragmentation region of the proton, in p-p collisions.
TL;DR: The general features of hadrons produced in charged current interaction of high-energy neutrinos on nucleons are shown to be basically consistent with the idea of quark fragmentation within the framework of the quark parton model as discussed by the authors.
CERN1
TL;DR: In this article, it was shown that Drell-Yan mass factorization in order α S is independent of all regularizatiohns; the coffcient function is unique.
TL;DR: Gluon bremsstrahlung processes inside the nucleon are investigated using the standard renormalization-group analysis in this article, which leads to analytic results for the parton distributions near $x = 1$ and $x= 0$.
Abstract: Gluon bremsstrahlung processes inside the nucleon are investigated using the standard renormalization-group analysis. A new method of inverting the moments is applied which leads to analytic results for the parton distributions near $x=1$ and $x=0$. The nucleon is considered as a bound state of three quarks subsequently "renormalized" by gluon bremsstrahlung and quark-antiquark pair production. An "unrenormalized" valence quark distribution peaked at $x=\frac{1}{3}$, with a width related to the nucleon radius, leads to good agreement with deep-inelastic data. However, the gluon distribution obtained seems too steep near $x=0$.
TL;DR: In this paper, a parton model describing all the parts of nondiffractive small-p/sub perpendicular/particle production is presented on the basis of quantum-chromodynamics inspired multijet view, universality of quark-jet hadronization, and correspondence arguments to dual Regge models.
Abstract: We present a parton model describing all the parts of nondiffractive small-p/sub perpendicular/ particle production on the basis of (i) quantum-chromodynamics inspired multijet view, (ii) universality of quark-jet hadronization, and (iii) correspondence arguments to dual Regge models. The model reproduces well, without any adjustable parameters, experimental data on average multiplicities and meson distributions in the fragmentation region of mesons and in p-barp annihilation. We argue that the quark-recombination mechanism of Das and Hwa is incorporated in our model in the form of a nonvanishing quark decay function D (z) at z ..-->.. 1. A new test of the multijet point of view is also proposed.
Book•
01 Jan 1979
TL;DR: The Whys of Subnuclear Physics: Why Is There Charm, Strangeness, Colour and All That?- Do Mesons Fill SU(3) Nonets?- The Properties of Charmonium and Charm Particles- Recent Results from DASP- New Particles or "Why I Believe in Quarks"- New Particle production in Hadronic Interactions- Review of Lepton Production in Hadron - Hadron Collisions- Narrow Resonances in B?B Reactions- Parton Distributions and Their Q2 Dependence- Total Cross Sections of
Abstract: The Whys of Subnuclear Physics- Why Is There Charm, Strangeness, Colour and All That?- Do Mesons Fill SU(3) Nonets?- The Properties of Charmonium and Charm Particles- Recent Results from DASP- New Particles or "Why I Believe in Quarks"- New Particle Production in Hadronic Interactions- Review of Lepton Production in Hadron - Hadron Collisions- Narrow Resonances in B?B Reactions- Parton Distributions and Their Q2 Dependence- Total Cross Sections of Neutrinos and Antineutrinos in BEBC in the Energy Range 20-200 GeV- Measurement of Neutral Current Cross-Sections and Their Energy and y - Dependence- Charged V+A Currents in Left-Right Symmetric Gauge Models- Quark and Lepton Mixing- Quark-Geometrodynamics: A New Approach to Hadrons and Their Interactions- The Uses of Instantons- Can We Make Sense Out of "Quantum Chromodynamics"?- Should We Believe in Quantum Field Theory?- An Exact Relativistic S-Matrix in 1+1 Dimensions: The On-Shell Solution of the Massive Thirring Model and the Quantum Sine-Gordon Equation- Dynamical Symmetries in Nuclear Physics- Symmetries of Quarks and Leptons- The Best Why- Status of the Subnuclear Whys- List of Prizes Awarded, Scholarships, etc- List of Participants
CERN1
TL;DR: In the naive parton model, the single hadron inclusive cross section of a deep inelastic neutrino reaction factorizes W ( X, Z ) = f ( X ) D ( Z ).
TL;DR: In this article, the authors calculate diffractive production in nucleon-nucleus collisions using a parton model and fit the result by the standard optical-model formula, and obtain estimates of 12-30 mb for the cross section of the diffractively produced system on a nucleon.
Abstract: We calculate diffractive production in nucleon-nucleus collisions using a parton model. We fit the result by the standard optical-model formula, and obtain estimates of 12--30 mb for the cross section of the diffractively produced system on a nucleon. The actual value of that cross section in the model is 65 mb. Estimates for the total cross section of an unstable hadron which are based on the A dependence of coherent production should therefore not be trusted.
TL;DR: In this article, a large pT particle (π+, π-, K-, p) was produced at polar angle settings of 20° and 45° by a trigger jet of the same rapidity hemisphere as the trigger.