The pseudoscalar mixing angle Θ PS from ν and ν′ production in [formula omitted] annihiltion at rest

• Published in: Physics letters. B 1992-11, Vol.294 (3), p.451-456
• Main Authors: Amsler, C., Augustin, I., Baker, C.A., Barnett, B.M., Batty, C.J., Beuchert, K., Birien, P., Bistirlich, J., Blüm, P., Bossingham, R., Bossy, H., Braune, K., Bugg, D.V., Burchell, M., Case, T., Chung, S.U., Cooper, A., Crowe, K.M., Dietz, H.P., Dombrowski, S.V., Doser, M., Dünnweber, W., Engelhardt, D., Englert, M., Faessler, M.A., Felix, C., Folger, G., Hackmann, R., Haddock, R.P., Heinsius, F.H., Hessey, N.P., Hidas, P., Illinger, P., Jamnik, D., Kalinowsky, H., Kämmle, B., Kiel, T., Kisiel, J., Klempt, E., Kobel, M., Koch, H., Kolo, C., Königsmann, K., Kunze, M., Landau, R., Lüdemann, J., Matthaey, H., Merkel, M., Merlo, J.P., Meyer, C.A., Meyer-Berkhout, U., Montanet, L., Noble, A., Peters, K., Pinter, G., Ravndal, S., Sanjari, A.H., Schäfer, E., Schmid, B., Schmidt, P., Spanier, S., Straβburger, C., Strohbusch, U., Suffert, M., Urner, D., Völcker, C., Walther, D., Wiedner, U., Winter, N., Zoll, J., Zupančič, Č.
• Format: Article
• Language: English
• ISSN: 0370-2693; 1873-2445
• DOI: 10.1016/0370-2693(92)91547-M

We have determined ratios of branching ratios for p p annihilations at rest into π 0 η and π 0 η′, into ηη and ηη′, and into ωη and ωη′. All reactins are observed in two different all-neutral final states. The ratios permit a determination of the pseudoscalar mixing angle. We find Θ PS = −(17.3±1.8)°.