|
|||||
|
|
Observation of anomalous upsilon(1S)pi+pi(-) and upsilon(2S)pi+pi(-) production near the upsilon(5S) resonance |
|
| Authors: | Chen K-F Hou W-S Shapkin M Sokolov A Adachi I Aihara H Arinstein K Aulchenko V Aushev T Bakich A M Balagura V Bay A Belous K Bhardwaj V Bitenc U Bondar A Bozek A Bracko M Brodzicka J Browder T E Chang P Chao Y Chen A Chen W T Chistov R Choi Y Dalseno J Danilov M Dash M Drutskoy A Eidelman S Gabyshev N Golob B Ha H Haba J Hayasaka K Hayashii H Hazumi M Heffernan D Hoshi Y Hsiung Y B Hyun H J Iijima T Inami K Ishikawa A Ishino H Itoh R Iwasaki M Iwasaki Y Kah D H Kang J H Kapusta P Katayama N Kawai H Kawasaki T Kichimi H Kim H O Kim S K Kim Y J Kinoshita K Korpar S Krizan P Krokovny P Kumar R |
| Institution: | Department of Physics, National Taiwan University, Taipei. |
| Abstract: | We report the first observation of e;{+}e;{-}-->Upsilon(1S)pi;{+}pi;{-}, Upsilon(2S)pi;{+}pi;{-}, and first evidence for e;{+}e;{-}-->Upsilon(3S)pi;{+}pi;{-}, Upsilon(1S)K+K-, near the peak of the Upsilon(5S) resonance at sqrts] approximately 10.87 GeV. The results are based on a data sample of 21.7 fb;{-1} collected with the Belle detector at the KEKB e;{+}e;{-} collider. Attributing the signals to the Upsilon(5S) resonance, the partial widths Gamma(Upsilon(5S)-->Upsilon(1S)pi;{+}pi;{-})=0.59+/-0.04(stat)+/-0.09(syst) MeV and Gamma(Upsilon(5S)-->Upsilon(2S)pi;{+}pi;{-})=0.85+/-0.07(stat)+/-0.16(syst) MeV are obtained from the observed cross sections. These values exceed by more than 2 orders of magnitude the previously measured partial widths for dipion transitions between lower Upsilon resonances. |
| Keywords: | |
| 本文献已被 PubMed 等数据库收录！ | |