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

Abstract

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, the shape of the photon structure function, the production of hadronic jets with patterns conforming to elementary quark and gluon subprocesses. The experimental measurements appear to be consistent with basic postulates of QCD, that the charge and weak currents within hadrons are carried by fractionally-charged quarks, and that the strength of the interactions between the quarks, and gluons becomes weak at short distances, consistent with asymptotic freedom. Nevertheless in some cases, the predictions of QCD appear to be in dramatic conflict with experiment. The anomalies suggest that the proton itself as 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-nontrival proton structure. Solutions to QCD in one-space and one-time dimension suggest that the momentum distributions of non-valencemore » quarks in the hadrons have a non-trival oscillatory structure. The data seems also to be suggesting that the intrinsic'' bound state structure of the proton has a non- negligible strange and charm quark content, in addition to the extrinsic'' sources of heavy quarks created in the collision itself. 144 refs., 46 figs., 2 tabs.« less

Authors:
Publication Date:
Research Org.:
Stanford Linear Accelerator Center, Menlo Park, CA (USA)
Sponsoring Org.:
DOE/ER
OSTI Identifier:
5075028
Report Number(s):
SLAC-PUB-5116; CONF-8907177-2
ON: DE90005799; TRN: 90-005070
DOE Contract Number:  
AC03-76SF00515
Resource Type:
Conference
Resource Relation:
Conference: Ettore Majorana international school of subnuclear physics, Erice (Italy), 26 Jul - 3 Aug 1989
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; QUANTUM CHROMODYNAMICS; EVALUATION; BOUND STATE; BRANCHING RATIO; CHARMONIUM; CROSS SECTIONS; DEEP INELASTIC SCATTERING; FACTORIZATION; FINAL-STATE INTERACTIONS; FORM FACTORS; J PSI-3097 MESONS; LAGRANGIAN FUNCTION; LIGHT CONE; NUCLEAR REACTIONS; NUCLEAR STRUCTURE; PARTICLE PRODUCTION; PROTON-PROTON INTERACTIONS; PROTONS; QUARKONIUM; QUARKS; STRUCTURE FUNCTIONS; TAU PARTICLES; WAVE FUNCTIONS; BARYON-BARYON INTERACTIONS; BARYONS; BOSONS; ELEMENTARY PARTICLES; FERMIONS; FIELD THEORIES; FUNCTIONS; HADRON-HADRON INTERACTIONS; HADRONS; HEAVY LEPTONS; INELASTIC SCATTERING; INTERACTIONS; LEPTON-BARYON INTERACTIONS; LEPTON-HADRON INTERACTIONS; LEPTON-NUCLEON INTERACTIONS; LEPTONS; MESONS; NUCLEON-NUCLEON INTERACTIONS; NUCLEONS; PARTICLE INTERACTIONS; PARTICLE PROPERTIES; POSTULATED PARTICLES; PROTON-NUCLEON INTERACTIONS; QUANTUM FIELD THEORY; SCATTERING; SPACE-TIME; VECTOR MESONS; 645200* - High Energy Physics- Particle Interactions & Properties-Theoretical

Citation Formats

Brodsky, S J. Challenges to quantum chromodynamics: Anomalous spin, heavy quark, and nuclear phenomena. United States: N. p., 1989. Web.
Brodsky, S J. Challenges to quantum chromodynamics: Anomalous spin, heavy quark, and nuclear phenomena. United States.
Brodsky, S J. 1989. "Challenges to quantum chromodynamics: Anomalous spin, heavy quark, and nuclear phenomena". United States. https://www.osti.gov/servlets/purl/5075028.
@article{osti_5075028,
title = {Challenges to quantum chromodynamics: Anomalous spin, heavy quark, and nuclear phenomena},
author = {Brodsky, S J},
abstractNote = {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, the shape of the photon structure function, the production of hadronic jets with patterns conforming to elementary quark and gluon subprocesses. The experimental measurements appear to be consistent with basic postulates of QCD, that the charge and weak currents within hadrons are carried by fractionally-charged quarks, and that the strength of the interactions between the quarks, and gluons becomes weak at short distances, consistent with asymptotic freedom. Nevertheless in some cases, the predictions of QCD appear to be in dramatic conflict with experiment. The anomalies suggest that the proton itself as 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-nontrival 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-trival oscillatory structure. The data seems also to be suggesting that the intrinsic'' bound state structure of the proton has a non- negligible strange and charm quark content, in addition to the extrinsic'' sources of heavy quarks created in the collision itself. 144 refs., 46 figs., 2 tabs.},
doi = {},
url = {https://www.osti.gov/biblio/5075028}, journal = {},
number = ,
volume = ,
place = {United States},
year = {1989},
month = {11}
}

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