Role of tensor meson pole and {Delta} exchange diagrams in {ital p{bar p}}{r_arrow}{pi}{sup +}{pi}{sup {minus}}
- Department of Physics, University of the Witwatersrand, P.O. WITS, Johannesburg 2050 (South Africa)
The {bar {ital N}}{ital N}{r_arrow}{pi}{pi} annihilation reaction is investigated in a model with both baryon-exchange diagrams and meson-pole diagrams. The main features of the observed differential cross sections for {bar {ital p}}{ital p}{r_arrow}{pi}{sup +}{pi}{sup {minus}} from 360 to 1190 MeV/{ital c} are well understood in this model. The backward enhancement of the differential cross section is mainly due to the {ital N}{Delta}{pi} tensor coupling while the process {bar {ital p}}{ital p}{r_arrow}{ital f}{sub 2}{r_arrow}{pi}{sup +}{pi}{sup {minus}} contributes to the bump structure around 100{degree} developing for {ital P}{sub lab}{approx_gt}680 MeV/{ital c}. This hints at nontrivial quark spin contributions beyond the {sup 3}{ital P}{sub 0} model (which favored {ital S} and {ital P} waves) and hints at a large gluonic component in tensor mesons with masses between 1.27 and 2.2 GeV. {copyright} {ital 1996 The American Physical Society.}
- OSTI ID:
- 383355
- Journal Information:
- Physical Review, C, Vol. 54, Issue 3; Other Information: PBD: Sep 1996
- Country of Publication:
- United States
- Language:
- English
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