Observation of the hadronic transitions Xb1,2(2P) → ωY(1S)

Daniel P Cronin-Hennessy,C. S. Park, W. Park,J. B. Thayer, E. H. Thorndike,T. E. Coan,Y. S. Gao,F. Liu,Ryszard Stroynowski,Marina Artuso, C. Boulahouache,S. Blusk, E. Dambasuren,O. Dorjkhaidav, R. Mountain,H. Muramatsu,R. Nandakumar,Tomasz Skwarnicki,Sheldon Stone,Jing Wang, A. H. Mahmood, S. E. Csorna, G. Bonvicini,D. Cinabro, M. Dubrovin,A. Bornheim, E. Lipeles,S. P. Pappas, A. Shapiro,W. M. Sun,A. J. Weinstein,R. A. Briere,G. P. Chen,Thomas Ferguson, G. Tatishvili, Hans J. Vogel,M. E. Watkins, N. E. Adam, J. P. Alexander, Karl Berkelman, V. Boisvert,D. G. Cassel,J. E. Duboscq,K. M. Ecklund, R. Ehrlich,R. S. Galik, L. K. Gibbons, B. Gittelman,S. W. Gray,D. L. Hartill,B. K. Heltsley, L. Hsu,C. D. Jones, J. Kandaswamy,D. L. Kreinick,V. E. Kuznetsov, A. Magerkurth, H. Mahlke-Krüger,T. O. Meyer,N. B. Mistry,Juliet Ritchie Patterson,T. K. Pedlar, D. Peterson, J. Pivarski,S. J. Richichi, D. Riley,A. J. Sadoff, H. Schwarthoff,M. R. Shepherd,J. G. Thayer, D. Urner,T. Wilksen,Andreas Warburton, M. Weinberger,S. B. Athar,Paul Avery, L. Breva-Newell, V. Potlia, H. Stoeck,John Yelton,B. I. Eisenstein,G. D. Gollin,I. Karliner, N. Lowrey, C. Plager, C. Sedlack,Mats A Selen,J. J. Thaler,J. Williams,K. W. Edwards,D. Z. Besson,K. Y. Gao,D. T. Gong,Yuichi Kubota,Shuwang Li,R. Poling,A. W. Scott,A. Smith, C. J. Stepaniak, J. Urheim

Physical Review Letters（2004）

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摘要

The CLEO Collaboration has made the first observations of hadronic transitions among bottomonium (bbmacr;) states other than the dipion transitions among Upsilon(nS) states. In our study of Upsilon(3S) decays, we find a significant signal for Upsilon(3S)-->gammaomegaUpsilon(1S) that is consistent with radiative decays Upsilon(3S)-->gammachi(b1,2)(2P), followed by chi(b1,2)(2P)-->omegaUpsilon(1S). The branching ratios we obtain are B[chi(b1)(2P)-->omegaUpsilon(1S)]=(1.63(+0.35+0.16)(-0.31-0.15))% and B[chi(b2)(2P)-->omegaUpsilon(1S)]=(1.10(+0.32+0.11)(-0.28-0.10))%, in which the first error is statistical and the second is systematic.

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