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Search for the decay upsilon(1S) --> gammaeta(') |
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| Authors: | Richichi S J Severini H Skubic P Dytman S A Savinov V Chen S Hinson J W Lee J Miller D H Shibata E I Shipsey I P Pavlunin V Cronin-Hennessy D Lyon A L Park W Thorndike E H Coan T E Gao Y S Liu F Maravin Y Narsky I Stroynowski R Ye J Artuso M Boulahouache C Bukin K Dambasuren E Majumder G Mountain R Skwarnicki T Stone S Wang J C Zhao H Kopp S Kostin M Mahmood A H Csorna S E Danko I McLean K W Xu Z Godang R Bonvicini G Cinabro D Dubrovin M McGee S Bornheim A Lipeles E Pappas S P Shapiro A Sun W M Weinstein A J Jaffe D E Mahapatra R Masek G Paar H P Morrison R J Briere R A Chen G P Ferguson T |
| Institution: | University of Oklahoma, Norman, Oklahoma 73019, USA. |
| Abstract: | We report on a search for the radiative decay Upsilon(1S)-->gammaeta(') in 61.3 pb(-1) of data taken with the CLEO II detector at the Cornell Electron Storage Ring. Three decay chains were investigated, all involving eta(')-->pi(+)pi(-)eta, followed by eta-->gammagamma, eta-->pi(0)pi(0)pi(0), or eta-->pi(+)pi(-)pi(0). We find no candidate events in any of the three cases and set a combined upper limit of 1.6x10(-5) at 90% C.L., significantly smaller than the previous limit. We compare our result to other radiative Upsilon decays, to radiative J/psi decays, and to theoretical predictions. |
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