# Heavy-quark physics in quantum chromodynamics

## Abstract

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 of high-mass fluctuations of multi-gluon correlations in hadronic wavefunctions. A non-perturbative calculation of the heavy quark distribution of a meson in QCD in one space and one time is presented. The intrinsic higher twist contributions to the pion and proton structure functions can dominate the hadronic production of heavy quark systems at large longitudinal momentum fraction x{sub F} and give anomalous contributions to the quark structure functions of ordinary hadrons at large x{sub bj}. I also discuss a number of ways in which heavy quark production in nuclear targets can test fundamental QCD phenomena and provide constraints on hadronic wavefunctions. Themore »

- Authors:

- Publication Date:

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

- Sponsoring Org.:
- USDOE; USDOE, Washington, DC (USA)

- OSTI Identifier:
- 5846522

- Report Number(s):
- SLAC-PUB-5529; CONF-910229-3

ON: DE91012113

- DOE Contract Number:
- AC03-76SF00515

- Resource Type:
- Conference

- Resource Relation:
- Conference: 6. Lake Louise winter institute (LLWI-6): topical workshop on particle physics - the factory era, Lake Louise (Canada), 17-22 Feb 1991

- Country of Publication:
- United States

- Language:
- English

- Subject:
- 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; QUARKONIUM; QUANTUM CHROMODYNAMICS; BOTTOMONIUM; BRANCHING RATIO; CHARM PARTICLES; EXCLUSIVE INTERACTIONS; FORM FACTORS; GLUONS; HEAVY ION REACTIONS; J PSI-3097 MESONS; LAGRANGIAN FUNCTION; LIGHT CONE; PARTICLE DECAY; PARTICLE PRODUCTION; QUARKS; STRUCTURE FUNCTIONS; WAVE FUNCTIONS; BOSONS; CHARGED-PARTICLE REACTIONS; CHARMONIUM; DECAY; ELEMENTARY PARTICLES; FERMIONS; FIELD THEORIES; FUNCTIONS; HADRONS; INTERACTIONS; MESONS; NUCLEAR REACTIONS; PARTICLE INTERACTIONS; PARTICLE PROPERTIES; POSTULATED PARTICLES; QUANTUM FIELD THEORY; SPACE-TIME; VECTOR MESONS; 645200* - High Energy Physics- Particle Interactions & Properties-Theoretical

### Citation Formats

```
Brodsky, S J.
```*Heavy-quark physics in quantum chromodynamics*. United States: N. p., 1991.
Web.

```
Brodsky, S J.
```*Heavy-quark physics in quantum chromodynamics*. United States.

```
Brodsky, S J. Mon .
"Heavy-quark physics in quantum chromodynamics". United States. https://www.osti.gov/servlets/purl/5846522.
```

```
@article{osti_5846522,
```

title = {Heavy-quark physics in quantum chromodynamics},

author = {Brodsky, S J},

abstractNote = {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 of high-mass fluctuations of multi-gluon correlations in hadronic wavefunctions. A non-perturbative calculation of the heavy quark distribution of a meson in QCD in one space and one time is presented. The intrinsic higher twist contributions to the pion and proton structure functions can dominate the hadronic production of heavy quark systems at large longitudinal momentum fraction x{sub F} and give anomalous contributions to the quark structure functions of ordinary hadrons at large x{sub bj}. I also discuss a number of ways in which heavy quark production in nuclear targets can test fundamental QCD phenomena and provide constraints on hadronic wavefunctions. The topics include color transparency, finite formation time, and predictions for charm production at threshold, including nuclear-bound quarkonium. I also discuss a number of QCD mechanisms for the suppression of J/{psi} and {Upsilon} production in nuclear collisions, including gluon shadowing, the peripheral excitation of intrinsic heavy quark components at large x{sub F}, and the coalescence of heavy quarks with co-moving spectators at low x{sub F}.},

doi = {},

url = {https://www.osti.gov/biblio/5846522},
journal = {},

number = ,

volume = ,

place = {United States},

year = {1991},

month = {4}

}