Topics in nuclear chromodynamics: Color transparency and hadronization in the nucleus

Title: Topics in nuclear chromodynamics: Color transparency and hadronization in the nucleus

Full Record
Other Related Research

Abstract

The nucleus plays two complimentary roles in quantum chromodynamics: (1) A nuclear target can be used as a control medium or background field to modify or probe quark and gluon subprocesses. Some novel examples are color transparency, the predicted transparency of the nucleus to hadrons participating in high momentum transfer exclusive reactions, and formation zone phenomena, the absence of hard, collinear, target-induced radiation by a quark or gluon interacting in a high momentum transfer inclusive reaction if its energy is large compared to a scale proportional to the length of the target. (Soft radiation and elastic initial state interactions in the nucleus still occur.) Coalescence with co-moving spectators is discussed as a mechanism which can lead to increased open charm hadroproduction, but which also suppresses forward charmonium production (relative to lepton pairs) in heavy ion collisions. Also discussed are some novel features of nuclear diffractive amplitudes--high energy hadronic or electromagnetic reactions which leave the entire nucleus intact and give nonadditive contributions to the nuclear structure function at low /kappa cur//sub Bj/. (2) Conversely, the nucleus can be studied as a QCD structure. At short distances, nuclear wave functions and nuclear interactions necessarily involve hidden color, degrees of freedom orthogonal tomore »« less

Authors:: Brodsky, S J

Publication Date:: 1988-03-01

Research Org.:: Stanford Linear Accelerator Center, Menlo Park, CA (USA)

OSTI Identifier:: 6993081

Report Number(s):: SLAC-PUB-4551; CONF-880331-6
ON: DE88010679

DOE Contract Number:: AC03-76SF00515

Resource Type:: Conference

Resource Relation:: Conference: 3. Lake Louise Winter Institute on quantum chromodynamics: theory and experiment, Lake Louise, Canada, 6 Mar 1988

Country of Publication:: United States

Language:: English

Subject:: 73 NUCLEAR PHYSICS AND RADIATION PHYSICS; NUCLEAR MODELS; QUANTUM CHROMODYNAMICS; DEGREES OF FREEDOM; ELASTIC SCATTERING; EXCLUSIVE INTERACTIONS; HADRON REACTIONS; HADRONIC PARTICLE DECAY; HELICITY; J PSI-3097 MESONS; LIGHT CONE; PROTON-PROTON INTERACTIONS; QUANTIZATION; SELECTION RULES; STRUCTURE FUNCTIONS; WAVE FUNCTIONS; BARYON-BARYON INTERACTIONS; BOSONS; CHARMONIUM; DECAY; ELEMENTARY PARTICLES; FIELD THEORIES; FUNCTIONS; HADRON-HADRON INTERACTIONS; HADRONS; INTERACTIONS; MATHEMATICAL MODELS; MESONS; NUCLEAR REACTIONS; NUCLEON-NUCLEON INTERACTIONS; PARTICLE DECAY; PARTICLE INTERACTIONS; PARTICLE PROPERTIES; PROTON-NUCLEON INTERACTIONS; QUANTUM FIELD THEORY; QUARKONIUM; SCATTERING; SPACE-TIME; VECTOR MESONS; 653001* - Nuclear Theory- Nuclear Structure, Moments, Spin, & Models

Citation Formats


                    Brodsky, S J. Topics in nuclear chromodynamics: Color transparency and hadronization in the nucleus.  United States: N. p., 1988. 
        Web.

Copy to clipboard


                    Brodsky, S J. Topics in nuclear chromodynamics: Color transparency and hadronization in the nucleus.  United States.

Copy to clipboard


                    Brodsky, S J. Tue .  
        "Topics in nuclear chromodynamics: Color transparency and hadronization in the nucleus".  United States.  https://www.osti.gov/servlets/purl/6993081.

Copy to clipboard


                    
@article{osti_6993081,

  title        = {Topics in nuclear chromodynamics: Color transparency and hadronization in the nucleus},

  author       = {Brodsky, S J},

  abstractNote = {The nucleus plays two complimentary roles in quantum chromodynamics: (1) A nuclear target can be used as a control medium or background field to modify or probe quark and gluon subprocesses. Some novel examples are color transparency, the predicted transparency of the nucleus to hadrons participating in high momentum transfer exclusive reactions, and formation zone phenomena, the absence of hard, collinear, target-induced radiation by a quark or gluon interacting in a high momentum transfer inclusive reaction if its energy is large compared to a scale proportional to the length of the target. (Soft radiation and elastic initial state interactions in the nucleus still occur.) Coalescence with co-moving spectators is discussed as a mechanism which can lead to increased open charm hadroproduction, but which also suppresses forward charmonium production (relative to lepton pairs) in heavy ion collisions. Also discussed are some novel features of nuclear diffractive amplitudes--high energy hadronic or electromagnetic reactions which leave the entire nucleus intact and give nonadditive contributions to the nuclear structure function at low /kappa cur//sub Bj/. (2) Conversely, the nucleus can be studied as a QCD structure. At short distances, nuclear wave functions and nuclear interactions necessarily involve hidden color, degrees of freedom orthogonal to the channels described by the usual nucleon or isobar degrees of freedom. At asymptotic momentum transfer, the deuteron form factor and distribution amplitude are rigorously calculable. One can also derive new types of testable scaling laws for exclusive nuclear amplitudes in terms of the reduced amplitude formalism.},

  doi          = {},

  url          = {https://www.osti.gov/biblio/6993081},
  journal      = {},
number       = ,

  volume       = ,

  place        = {United States},

  year         = {1988},

  month        = {3}

}

Copy to clipboard

Conference:

View Conference (1.79 MB)

Other availability

Please see Document Availability for additional information on obtaining the full-text document. Library patrons may search WorldCat to identify libraries that hold this conference proceeding.

Save / Share:

Export Metadata

Save to My Library

Similar records in OSTI.GOV collections:

Testing Quantum Chromodynamics with Antiprotons

Technical Report Brodsky, S

The antiproton storage ring HESR to be constructed at GSI will open up a new range of perturbative and nonperturbative tests of QCD in exclusive and inclusive reactions. I discuss 21 tests of QCD using antiproton beams which can illuminate novel features of QCD. The proposed experiments include the formation of exotic hadrons, measurements of timelike generalized parton distributions, the production of charm at threshold, transversity measurements in Drell-Yan reactions, and searches for single-spin asymmetries. The interactions of antiprotons in nuclear targets will allow tests of exotic nuclear phenomena such as color transparency, hidden color, reduced nuclear amplitudes, and themore »« less
https://doi.org/10.2172/839984

Full Text Available
Novel High Transverse Momentum Phenomena in Hadronic and Nuclear Collisions

Conference Brodsky, Stanley J ; /SLAC

I discuss a number of novel phenomenological features of QCD in high transverse momentum reactions. The presence of direct higher-twist processes, where a proton is produced directly in the hard subprocess, can explain the 'baryon anomaly' - the large proton-to-pion ratio seen at RHIC in high centrality heavy ion collisions. Direct hadronic processes can also account for the deviation from leading-twist PQCD scaling at fixed x{sub T} = 2 p{sub T}/{radical}s. I suggest that the 'ridge' --the same-side long-range rapidity correlation observed at RHIC in high centrality heavy ion collisions is due to the imprint of semihard DGLAP gluon radiationmore »« less
Full Text Available
Heavy-quark physics in quantum chromodynamics

Conference Brodsky, S J

Heavy quarks can expose new symmetries and novel phenomena in QCD not apparent in ordinary hadronic systems. In these lectures I discuss the use of effective-Lagrangian and light-cone Fock methods to analyze exclusive heavy hadron decays such as {Upsilon} {yields} p{bar p} and B {yields} {pi}{pi}, and also to derive effective Schroedinger and Dirac equations for heavy quark systems. Two contributions to the heavy quark structure functions of the proton and other light hadrons are identified: an extrinsic'' contribution associated with leading twist QCD evolution of the gluon distribution, and a higher twist intrinsic'' contribution due to the hardness ofmore »« less
Full Text Available
Polarization phenomena in quantum chromodynamics

Conference Brodsky, S J

The author discusses a number of interrelated hadronic spin effects which test fundamental features of perturbative and nonperturbative QCD. For example, the anomalous magnetic moment of the proton and the axial coupling g{sub A} on the nucleon are shown to be related to each other for fixed proton radius, independent of the form of the underlying three-quark relativistic quark wavefunction. The renormalization scale and scheme ambiguities for the radiative corrections to the Bjorken sum rule for the polarized structure functions can be eliminated by using commensurate scale relations with other observables. Other examples include (a) new constraints on the shapemore »« less
Full Text Available
Polarization phenomena in quantum chromodynamics

Conference Brodsky, S J

The author discusses a number of interrelated hadronic spin effects which test fundamental features of perturbative and non-perturbative QCD. For example, the anomalous magnetic moment of the proton and the axial coupling g{sub A} on the nucleon are shown to be related to each other for fixed proton radius, independent of the form of the underlying three-quark relativistic quark wavefunction. The renormalization scale and scheme ambiguities for the radiative corrections to the Bjorken sum rule for the polarized structure functions can be eliminated by using commensurate scale relations with other observables. Other examples include (a) new constraints on the shapemore »« less
Full Text Available

Similar Records