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in subjects: "Structure Functions"

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Massive lepton pair production. [Review, parton model, Drell-Yan mechanism]

In this review of massive lepton pair production the Drell-Yan mechanism is defined in terms of the parton model, and the modifications expected from Quantum Chromodynamics description of the process are described. The problems of the phenomenology of the data are described. Included in addition are particle-type dependence, mass spectra, momentum spectra of lepton pairs, Quantum Chromodynamics phenomenology of lepton pair production, angular distributions, structure functions and quark distrib… more

Date: September 1, 1979

Creator: Stroynowski, R.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Short times and short distances in nuclear and particle physics: A pedagogical review

The formalism relevant to deep inelastic processes in both non- relativistic and relativistic systems is reviewed with an emphasis on scaling and its violations. In the former case we show how a systematic expansion in 1/q/sup 2/ (q being the momentum transfer) can be derived which delineates the incoherent scattering from bound state and potential corrections. We demonstrate how this exact many-body non-relativistic formalism corresponds to the light-cone operator product expansion in quantum … more

Date: January 1, 1988

Creator: West, G.B.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Overview of high energy physics with polarized particles

The purpose of this talk is to review spin effects in various areas of particle physics at high energy and by selecting the most interesting topics, to show the relevance of dealing with polarized particles. We will see that it provides crucial tests for the Standard Model and can give us clear signatures to uncover new interactions. We will also discuss some striking experimental facts recently observed in hadronic collisions and their implications for current theoretical ideas. 43 refs., 10 f… more

Date: August 1, 1990

Creator: Soffer, J.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Theoretical implications on ISABELLE physics

A brief historical review of the development of understanding of the weak interaction and its final unification with electromagnetic theory is given first. Then the production cross sections of W/sup + -/ and Z/sup 0/ in hadronic scatterings are estimated; CVC, scaling, Drell-Yan model, structure functions and perturbative QCD, sigma/sub w/, sigma/sub z/, and production rate are aspects considered. Next, the detection of the Z/sup 0/ and W/sup + -/ in leptonic decay and hadronic decay is discus… more

Date: January 1, 1980

Creator: Wang, L. L. C.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Some physical aspects of higher twist

A brief description of some of the physical origins of higher twist terms and their possible relevance to data is given. 13 references, 7 figures.

Date: May 1, 1980

Creator: Blankenbecler, R.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Tests of perturbative quantum chromodynamics in photon-photon collisions

The production of hadrons in the collision of two photons via the process e/sup +/e/sup -/ ..-->.. e/sup +/e/sup -/X can provide an ideal laboratory for testing many of the features of the photon's hadronic interactions, especially its short-distance aspects. That part of two-photon physics which is particularly relevant to tests of perturbative QCD is reviewed here. 6 figures.

Date: January 1, 1979

Creator: Brodsky, Stanley J.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Particle production through two-photon processes in relativistic heavy-ion colliders

Particle production via two-photon processes in relativistic heavy-ion colliders is discussed. We consider the coherent production, including its impact parameter dependence, and incoherent production. Particular attention is given to Higgs boson production in the energy regime of the LHC and the SSC. 15 refs., 7 figs., 1 tab.

Date: January 1, 1991

Creator: Wu, J.-S.; Bottcher, C.; Strayer, M.R. (Oak Ridge National Lab., TN (United States)) & Shakin, C.M. (Brooklyn Coll., NY (United States))

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Hard hadronic collisions: extrapolation of standard effects

We study hard hadronic collisions for the proton-proton (pp) and the proton-antiproton (p anti p) option in the CERN LEP tunnel. Based on our current knowledge of hard collisions at the present CERN p anti p Collider, and with the help of quantum chromodynamics (QCD), we extrapolate to the next generation of hadron colliders with a centre-of-mass energy E/sub cm/ = 10 to 20 TeV. We estimate various signatures, trigger rates, event topologies, and associated distributions for a variety of old an… more

Date: January 1, 1984

Creator: Ali, A.; Aurenche, P.; Baier, R.; Berger, E.; Douiri, A.; Fontannaz, M. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Measurement of the nucleon structure function using high energy muons

We have measured the inclusive deep inelastic scattering of muons on nucleons in iron using beams of 93 and 215 GeV muons. To perform this measurement, we have built and operated the Multimuon Spectrometer (MMS) in the muon beam at Fermilab. The MMS is a magnetized iron target/spectrometer/calorimeter which provides 5.61 kg/cm/sup 2/ of target, 9% momentum resolution on scattered muons, and a direct measure of total hadronic energy with resolution sigma/sub nu/ = 1.4..sqrt..nu(GeV). In the dist… more

Date: December 1, 1983

Creator: Meyers, Peter Daniel

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Transverse momentum spectra of dimuons produced in hadronic interactions and comparison with QCD

We have reviewed comprehensively the data on the transverse momentum spectra (p/sub T/) of high mass lepton pairs produced in hadronic interations. The data are extensively compared with the predictions of Quantum Chromo Dynamics to O(..cap alpha../sub s/), including some O(..cap alpha../sub s//sup 2/) effects through the use of a p/sub T/ independent K factor. Sensitivity of the calculations to variations in the parameters used is discussed. A compilation of the K factor is given. Possible nuc… more

Date: December 1, 1982

Creator: Malhotra, P.K.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Neutral-Current X-Distributions

The role of the semi-leptonic neutral current interaction as a probe of nucleon structure is examined. Previous measurements of neutral current x-distributions are reviewed, and new results from the Fermilab - MIT - MSU collaboration are presented. 4 references.

Date: June 1984

Creator: Bogert, D.; Burnstein, R.; Fisk, R.; Fuess, S.; Bofill, J.; Busza, W. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Two-photon physics

Recent experimental results in two-photon physics are reviewed. Possibilities for future experimentation at high {gamma}{gamma} collision energies are discussed. 95 refs., 12 figs., 7 tabs.

Date: March 1, 1990

Creator: Cahn, R.N.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Lepton-pair production in hadron-nucleus collisions

The general features of lepton pair production are reviewed. Physics motivations for precision measurements of lepton pair production in nuclei are discussed. Preliminary results from Fermilab experiment E772 are presented. The relevance of these results to the EMC effects and to J//psi/ suppression in heavy ion collisions is also discussed. 73 refs., 26 figs., 2 tabs.

Date: January 1, 1988

Creator: Peng, J. C.; Alde, D. M.; Baer, H. W.; Carey, T. A.; Garvey, G. T.; Klein, A. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Generalized Vector Dominance and the Low q/sup 2/. mu. p and. mu. d Inelastic Scattering at 150 GeV. [Cross Sections, Structure Functions]

The generalized vector dominance model of Greco is used to relate recent electron and muon deep inelastic scattering measurements with the photoproduction cross section. An accurate fit of the SLAC 4/sup 0/ ep and ed scattering data for ..omega.. > 9 is obtained giving photoproduction cross sections in good accord with the directly measured values. The same fit applied to our recent ..mu..p and ..mu..d inelastic scattering measurements for q/sup 2/ < 1, gives estimates of sigma/sub ..gamma..d/ … more

Date: January 1, 1976

Creator: Anderson, H. L.; Bharadwaj, V. K. & Booth, N. E.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Large Momentum Transfer Electron Scattering From Few-Nucleon Systems

A review is given of the experimental results from a series of measurements at SLAC of large momentum transfer (Q/sup 2/ > 20 fm/sup -2/) electron scattering at forward angles from nuclei with A less than or equal to 4. Theoretical interpretations of these data in terms of traditional nuclear physics models and in terms of quark constituent models are described. Some physics questions for future experiments are explored, and a preview of possible future measurements of magnetic structure functi… more

Date: August 1, 1979

Creator: Arnold, R. G.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Virtual photoproduction of hidden and open charm

The Berkeley-Fermilab-Princeton multimuon spectrometer and the techniques used to analyze the data which it has collected are described first. Limits on the cross section with which possible heavy neutral or doubly charged muons are produced via right-handed charged currents are presented. Turning to heavy-quark muoproduction, the author then outlines the relevant phenomenology, emphasizing the predictions of the vector dominance (VMD) and photon-gluon-fusion models. The first heavy-quark data … more

Date: November 1, 1980

Creator: Clark, A.R.; Johnson, K.J. & Kerth, L.T.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Hadron supercolliders: The 1-TeV scale and beyond

Greater understanding of the connection between the weak and electromagnetic interactions is central to progress in elementary-particle physics. A definitive exploration of the mechanism for electroweak symmetry breaking will require collisions between fundamental constituents at energies on the order of 1 TeV. This goal drives the design of high-energy, high-luminosity hadron colliders that will be commissioned during the next decade, but by no means completely defines their scientific potenti… more

Date: August 10, 1990

Creator: Quigg, C.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Challenges to quantum chromodynamics: Anomalous spin, heavy quark, and nuclear phenomena

The general structure of QCD meshes remarkably well with the facts of the hadronic world, especially quark-based spectroscopy, current algebra, the approximate point-like structure of large momentum transfer inclusive reactions, and the logarithmic violation of scale invariance in deep inelastic lepton-hadron reactions. QCD has been successful in predicting the features of electron-positron and photon-photon annihilation into hadrons, including the magnitude and scaling of the cross sections, t… more

Date: November 1, 1989

Creator: Brodsky, Stanley J.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Weak boson effects in charged current neutrino and antineutrino interactions at very high (DUMAND) energies. [1 to 100 TeV, quark-parton model, Weinberg-Salam gauge model]

The charged current neutrino and antineutrino total cross sections and y-distributions at very high energies (1 to 100 TeV) using the standard quark-parton model have been calculated. A range of W boson masses was considered which includes the value in the Weinberg-Salam model. The parametrization of the quark structure functions was chosen to fit the highest energy data available (100 to 200 GeV) so that scaling violations could be neglected. The W boson propagator causes the total cross secti… more

Date: January 1979

Creator: Halprin, Arthur & Oakes, R. J.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

eP physics at the CBA

In this report we have tried to demonstrate how a 20 x 400 GeV eP facility at the CBA will complement the future physics of high energy e+e/sup -/ and hadron-hadron colliders. By offering the first glimpse of the physics of 17 TeV muon and neutrino beams, an eP collider will extend tests of the standard model by about an order of magnitude in spacelike momentum transfer, and thus close the final kinematic gap of knowledge about electro-weak processes. It will be especially interesting to test w… more

Date: January 1, 1982

Creator: Wiss, J. E.; White, D. H. & Morse, W. M.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

PEGASYS/Mark II: A program of internal target physics using the Mark II detector at the PEP storage ring

This document is a proposal to SLAC on behalf of the PEGASYS Collaboration for a program of internal target physics at PEP utilizing the Mark A detector. Having completed its tour of duty at SLC in November 1990, we propose that the Mark A detector be returned to the PEP storage ring, where it will be used in conjunction with a long gas target for studies of QCD with nucleon and nuclear targets, as well as tests of QED in lepton pair production, and a search for new neutral bosons. We expect th… more

Date: November 1, 1990

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Quantum chromodynamics and the dynamics of hadrons. [Review, bound state, perturbation theory]

The application of perturbative quantum chromodynamics to the dynamics of hadrons at short distance is reviewed, with particular emphasis on the role of the hadronic bound state. A number of new applications are discussed, including the modification to QCD scaling violations in structure functions due to hadronic binding; a discussion of coherence and binding corrections to the gluon and sea-quark distributions; QCD radiative corrections to dimensional counting rules for exclusive processes and… more

Date: March 1, 1979

Creator: Brodsky, Stanley J.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Color transparency and the structure of the proton in quantum chromodynamics

Many anomalies suggest that the proton itself is a much more complex object than suggested by simple non-relativistic quark models. Recent analyses of the proton distribution amplitude using QCD sum rules points to highly-nontrivial proton structure. Solutions to QCD in one-space and one-time dimension suggest that the momentum distributions of non-valence quarks in the hadrons have a non-trivial oscillatory structure. The data seems also to be suggesting that the intrinsic'' bound state struct… more

Date: June 1, 1989

Creator: Brodsky, Stanley J.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Quark structure functions of mesons, fragmentation functions, higher-twist effects in QCD, deep inelastic scattering, and the Drell-Yan process. [Constituent binding in hadron wave function cross section azimuthal angular dependence]

Inclusion of specific effects associated with constituent binding in hadronic wave functions is shown to lead to important nonscaling, nonfactorizing 1/Q/sup 2/ contributions to cross sections for semi-inclusive deep-inelastic scattering, the Drell-Yan process, and other hard scattering reactions. These 1/Q/sup 2/ higher-twist terms are predicted to be dominant in well defined kinematic regions such as large x and/or large z. They provide angular distributions typical of longitudinally polarize… more

Date: July 1, 1979

Creator: Berger, E. L.

Item Type: Article

Partner: UNT Libraries Government Documents Department