Search for narrow states coupling to τ pairs in radiative ϒ decays
1985; Elsevier BV; Volume: 154; Issue: 5-6 Linguagem: Inglês
10.1016/0370-2693(85)90429-0
ISSN1873-2445
AutoresH. Albrecht, U. Binder, G. Harder, H. Hasemann, A. Philipp, W. Schmidt‐Parzefall, H. Schröder, H.D. Schulz, R. Wurth, A. Drescher, B. Gräwe, U. Matthiesen, H. Scheck, J. Spengler, D. Wegener, R. Heller, 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, 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, P. Böckmann, L. Jönsson, Y. Oku, M. Danilov, V. Lubimov, V. Matveev, N. Nagovitsin, V. Ryltsov, A. Semenov, V. Shevchenko, V. Soloshenko, V. Sopov, I. Tichomirov, Yu. Zaitsev, R. Childers, C.W. Darden, H. Gennow,
Tópico(s)Dark Matter and Cosmic Phenomena
ResumoWe have investigated the ϒ→γττ using tagged ϒ mesons from the decay ϒ'→π+π−ϒ. The photon spectrum exhibits no monochromatic line corresponding to a narrow object decaying into a τ pair and is fully compatible with the expected background contributions. The branching ratio Br(ϒ→τ+τ− is determined to be (3.07±0.46±0.22)%.
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