Antiproton-proton annihilation at rest intoπ + π − η ′ andπ + π − η from atomicS andP states

Autor: H. Nguyen, W. Dahme, C. Laa, H. Vonach, U. Schaefer, J. Jeanjean, H. Kalinowsky, J. Reifenröther, U. Gastaldi, M. Heel, P. Weidenauer, S. Barlag, M. Comyn, Glenn M. Marshall, G. A. Beer, U. Straumann, Claude Amsler, M. Botlo, K. D. Duch, J.C. Bizot, B. Howard, D. Bailey, M. Ziegler, B. May, Eberhard Klempt, B. Delcourt, Shama Ahmad, R. Howard, M. Doser, L. P. Robertson, F. Feld-Dahme, R. Landua, F. Kayser, E.G. Auld, W. R. Wodrich, O. Schreiber, K. L. Erdman, B. L. White, J. Riedlberger, C. Sabev, J. N. Butler, P. Truöl, D. Axen
Rok vydání: 1990
Předmět:
Zdroj: Zeitschrift für Physik C Particles and Fields. 47:353-365
ISSN: 1434-6052
0170-9739
DOI: 10.1007/bf01565858
Popis: We have measured the branching ratios for\(\bar pp\) annihilation at rest intoπ+π−η andπ+π−η′ in hydrogen gas in two data samples that have different fractions ofS-wave andP-wave initial states. The branching ratios are derived from a comparison with the topological branching ratio for\(\bar pp\) annihilations into four charged pions of (49±4)% and the branching ratio intoπ+π−π+π−π0 of (18.7±1.6)%. We find a significant reduction of the branching ratios fromP-states for\(\bar pp \to \pi ^ + \pi ^ - \eta \) andπ+π−η′ in comparison toS-state annihilation. $$\begin{gathered} BR(S - wave \to \pi ^ + \pi ^ - \eta ) = (13.7 \pm 1.46) \cdot 10^{ - 3} \hfill \\ BR(P - wave \to \pi ^ + \pi ^ - \eta ) = (3.35 \pm 0.84) \cdot 10^{ - 3} \hfill \\ BR(S - wave \to \pi ^ + \pi ^ - \eta ') = (3.46 \pm 0.67) \cdot 10^{ - 3} \hfill \\ BR(P - wave \to \pi ^ + \pi ^ - \eta ') = (0.61 \pm 0.33) \cdot 10^{ - 3} . \hfill \\ \end{gathered} $$
Databáze: OpenAIRE
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