Bibliographic Citation
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| Title | Color-singlet quark-pair transmutation: Helicity amplitudes and partial-wave analysis |
| Creator/Author | Roberts, W. |
| Publication Date | 1989 Feb 01 |
| OSTI Identifier | OSTI ID: 6206685 |
| Other Number(s) | Journal ID: CODEN: PRVDA |
| Resource Type | Journal Article |
| Resource Relation | Journal Name: Phys. Rev. D; (United States); Journal Volume: 39:3 |
| Research Org | Guelph-Waterloo Program for Graduate Work in Physics, Department of Physics, University of Guelph, Guelph, Ontario, Canada N1G 2W1 |
| Subject | 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; GLUONS; PARTICLE PRODUCTION; QUARK-ANTIQUARK INTERACTIONS; ANNIHILATION; COLOR MODEL; DECAY; EIGENSTATES; EIGENVALUES; HELICITY; INFRARED DIVERGENCES; PARITY; PERTURBATION THEORY; QUANTUM CHROMODYNAMICS; SELECTION RULES; SPIN; THRESHOLD ENERGY; ANGULAR MOMENTUM; BASIC INTERACTIONS; COMPOSITE MODELS; ELECTROMAGNETIC INTERACTIONS; ELEMENTARY PARTICLES; ENERGY; FIELD THEORIES; INTERACTIONS; MATHEMATICAL MODELS; PARTICLE INTERACTIONS; PARTICLE MODELS; PARTICLE PROPERTIES; POSTULATED PARTICLES; QUANTUM FIELD THEORY; QUARK MODEL |
| Description/Abstract | Quark-pair transmutation via two gluons is the lowest-order, color-singlet process. In this paper the helicity amplitudes for this process are evaluated and a partial-wave analysis performed. The amplitudes for these annihilations are infrared divergent and this divergence is removed by giving the gluons a confinement mass. The results are generally dependent on this mass. Many of the features are similar to those of quark-pair annihilation into two gluons. Somewhat surprisingly, there is a large proportion of a 1/sup +/ partial wave. Threshold effects are understood in terms of threshold effects in pair annihilation into two gluons. However, there is a ''competition'' effect that depends on the ratio of masses of the initial- and final-quark pairs. For similar masses, singlet production dominates as expected, but for very dissimilar masses, singlet annihilation of the heavier pair competes with triplet production of the lighter pair. Some comments about the possible applications and extensions of this work are made. Obvious applications are to the Okubo-Zweig-Iizuka-rule-suppressed decays of quarkonia. Other applications include development of a quark-pair-creation model that differs from the usual /sup 3/P/sub 0/ and /sup 3/S/sub 1/ models. |
| Country of Publication | United States |
| Language | English |
| Format | Medium: X; Size: Pages: 938-952 |
| System Entry Date | 2008 Feb 07 |
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Last Updated: 11/19/2009