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Observation ofψ(3770)→ππJ/ψand Measurement ofΓee[ψ(2S)]
Adam, N. E.,Alexander, J. P.,Berkelman, K.,Cassel, D. G.,Crede, V.,Duboscq, J. E.,Ecklund, K. M.,Ehrlich, R.,Fields, L.,Galik, R. S.,Gibbons, L.,Gittelman, B.,Gray, R.,Gray, S. W.,Hartill, D. L.,Helts American Physical Society 2006 Physical Review Letters Vol.96 No.8
<P>We observe signals for the decays psi(3770) --> XJ/psi from data acquired with the CLEO detector operating at the CESR e+ e- collider with square root of s = 3773 MeV. We measure the following branching fractions Beta(psi(3770) --> XJ/psi and significances: (189 +/- 20 +/- 20) x 10(-5) (11.6sigma) for X = pi+ pi-, (80 +/- 25 +/- 16) x 10(-5) (3.4sigma) for X = pi0 pi0, and (87 +/- 33 +/- 22) x 10(-5) (3.5sigma) for X = eta, where the errors are statistical and systematic, respectively. The radiative return process e+ e- --> gamma psi(2S) populates the same event sample and is used to measure Gamma ee[psi(2S)] = (2.54 +/- 0.03 +/- 0.11) keV.</P>
New measurement of exclusive decays of theχc0andχc2to two-meson final states
Asner, D. M.,Edwards, K. W.,Reed, J.,Robichaud, A. N.,Tatishvili, G.,Briere, R. A.,Vogel, H.,Onyisi, P. U. E.,Rosner, J. L.,Alexander, J. P.,Cassel, D. G.,Duboscq, J. E.,Ehrlich, R.,Fields, L.,Galik, American Physical Society 2009 PHYSICAL REVIEW D - Vol.79 No.7