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Observation and analysis ofE mesons inbar p p annihilation at rest in H2 gas |
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| Authors: | K. D. Duch M. Heel H. Kalinowsky F. Kayser E. Klempt B. May O. Schreiber P. Weidenauer M. Ziegler D. Bailey S. Barlag J. M. Butler U. Gastaldi R. Landua C. Sabev W. Dahme F. Feld-Dahme U. Schaefer W. R. Wodrich J. C. Bizot B. Delcourt J. Jeanjean H. Nguyen E. G. Auld D. A. Axen K. L. Erdman B. Howard R. Howard B. L. White S. Ahmad M. Comyn G. M. Marshall G. Beer L. P. Robertson M. Botlo C. Laa H. Vonach C. Amsler M. Doser J. Riedlberger U. Straumann P. Truöl ASTERIX Collaboration |
| Affiliation: | 1. Institut für Physik, Johannes-Gutenberg-Universit?t, D-6500, Mainz, Federal Republic of Germany 7. CERN, CH-1211, Geneva 23, Switzerland 11. Sektion Physik, Ludwig-Maximilians-Universit?t, D-8000, München, Federal Republic of Germany 15. Laboratoire de l'Accélérateur Linéaire, Université de Paris-Sud, F-91405, Orsay, France 16. Department of Physics, University of British Columbia, V6T2A6, Vancouver, B.C., Canada 17. TRIUMF, V6T2A3, Vancouver, B.C., Canada 18. Department of Physics, University of Victoria, V8W2Y2, Victoria, B.C., Canada 19. Institut für Kernphysik, Universit?t Wien, A-1090, Wien, Austria 22. Physik Institut der Universit?t Zürich, CH-8001, Zürich, Switzerland |
| Abstract: | Antiproton-proton annihilation at rest in a gaseous H2 target at NTP into the final state π+ π? K ± π? (K 0) with an undetectedK 0 or (bar K^0 ) has been investigated. We observe theE(1420) resonance in the invariant mass spectrum (K 0)miss K ± π? with massM E =1413±8 MeV/c2 and widthГ E =62 ± 16MeV/c2 and find evidence for the production of thef 1(1285). The absolute branching ratio of (bar p) p → π+ π? E 0,E 0 →K 0 L K ± π ? at (61±6)%P wave annihilation is (3.0±0.9)·10?4 of all annihilations. The observed suppression of theE production fromP wave with respect to theS wave together with some simple selection rules suggest that the quantum numbers of theE(1420) areJ pc=0?+ and not I++. |
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