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Measurement of the muonic branching fractions of the narrow upsilon resonances |
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| Authors: | Adams G S Chasse M Cravey M Cummings J P Danko I Napolitano J Cronin-Hennessy D Park C S Park W Thayer J B Thorndike E H Coan T E Gao Y S Liu F Stroynowski R Artuso M Boulahouache C Blusk S Butt J Dambasuren E Dorjkhaidav O Menaa N Mountain R Muramatsu H Nandakumar R Redjimi R Sia R Skwarnicki T Stone S Wang J C Zhang K Csorna S E Bonvicini G Cinabro D Dubrovin M Bornheim A Pappas S P Weinstein A J Briere R A Chen G P Ferguson T Tatishvili G Vogel H Watkins M E Adam N E Alexander J P Berkelman K Cassel D G Duboscq J E Ecklund K M Ehrlich R Fields L Galik R S Gibbons L Gittelman B Gray R |
| Affiliation: | Rensselaer Polytechnic Institute, Troy, New York 12180, USA. |
| Abstract: | The decay branching fractions of the three narrow Upsilon resonances to mu(+)mu(-) have been measured by analyzing about 4.3 fb(-1) e(+)e(-) data collected with the CLEO III detector. The branching fraction B(Upsilon(1S)-->mu(+)mu(-))=(2.49+/-0.02+/-0.07)% is consistent with the current world average, but B(Upsilon(2S)-->mu(+)mu(-))=(2.03+/-0.03+/-0.08)% and B(Upsilon(3S)-->mu(+)mu(-))=(2.39+/-0.07+/-0.10)% are significantly larger than prior results. These new muonic branching fractions imply a narrower total decay width for the Upsilon(2S) and Upsilon(3S) resonances and lower other branching fractions that rely on these decays in their determination. |
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