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Radiative decays of the ϒ(2S) into the three χb states

1985; Elsevier BV; Volume: 160; Issue: 4-5 Linguagem: Inglês

10.1016/0370-2693(85)91338-3

1873-2445

H. Albrecht, U. Binder, G. Harder, I. Lembke-Koppitz, A. Philipp, W. Schmidt‐Parzefall, H. Schröder, H.D. Schulz, R. Wurth, A. Drescher, B. Gräwe, U. Matthiesen, H. Scheck, J. Spengler, D. Wegener, K. R. Schubert, J. Stiewe, R. Waldi, S. Weseler, N.N. Brown, K. W. Edwards, W.R. Frisken, C. Fukunaga, D.J. Gilkinson, D. M. Gingrich, M. Goddard, H. Kapitza, P.C.H. Kim, R. Kutschke, D. B. MacFarlane, J. A. McKenna, K. W. McLean, A.W. Nilsson, R. S. Orr, P. Padley, P. M. Patel, J.D. Prentice, H. Seywerd, B.J. Stacey, T.-S. Yoon, J. C. Yun, R. Ammar, D. Coppage, R. Davis, S. G. Kanekal, N. Kwak, G. Kernel, M. Pleško, L. Jönsson, Y. Oku, A. Babaev, M. Danilov, A. Golutvin, V. Lubimov, V. Matveev, V. Nagovitsin, V. Ryltsov, A. Semenov, V. Shevchenko, V. Soloshenko, V. Sopov, I. Tichomirov, Yu. Zaitsev, R. Childers, C.W. Darden, H. Gennow,

Nuclear physics research studies

The ARGUS detector at the e+e− storage ring DORIS II has been used as a pair spectrometer to study the photon transitions in the reaction ϒ(2S)→γχb(13P2,1,0). Three photon lines were observed with energies (110.6±0.3±0.9) MeV, (131.7±0.3±1.1) MeV and (162.1±0.5±1.4) MeV, respectively. The corresponding branching ratios were found to be (9.8±2.1±2.4)%, (9.1±1.8±2.2)% and (6.4±1.4±1.6)%. Upper limits for full widths at the 90% confidence limit are 1.0 MeV for the χb(13P2) and 2.6 MeV for the other two states.