Direct observation and partial-width measurement of γγ decay of charmonium states

As part of the charmonium formation experiment at the CERN Intersecting Storage Rings, we studied the reaction p p →c c →γγ in an antiproton momentum scan through the η c, χ 1, and χ 2 regions. We report events observed in the η c and χ 2 regions, whilst no event was observed in the χ 1 region, as e...

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Bibliographic Details
Published in:Physics letters. B 1987-03, Vol.187 (1), p.191-197
Main Authors: Baglin, C., Baird, S., Bassompierre, G., Borreani, G., Brient, J.-C., Broll, C., Brom, J.-M., Bugge, L., Buran, T., Burq, J.-P., Bussière, A., Buzzo, A., Cester, R., Chemarin, M., Chevallier, M., Escoubes, B., Fay, J., Ferroni, S., Gracco, V., Guillaud, J.-P., Khan-Aronsen, E., Ille, B., Kirsebom, K., Lambert, M., Leistam, L., Lundby, A., Macri, M., Marchetto, F., Menichetti, E., Mörch, Ch, Mouellic, B., Pastrone, N., Petrillo, L., Pia, M.G., Poole, J., Poulet, M., Rinaudo, G., Santroni, A., Severi, M., Skjevling, G., Stugu, B.
Format: Article
Language:English
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Summary:As part of the charmonium formation experiment at the CERN Intersecting Storage Rings, we studied the reaction p p →c c →γγ in an antiproton momentum scan through the η c, χ 1, and χ 2 regions. We report events observed in the η c and χ 2 regions, whilst no event was observed in the χ 1 region, as expected for a spin-1 state.
ISSN:0370-2693
1873-2445
DOI:10.1016/0370-2693(87)90098-0