Study of dipion transitions among Υ(3S), Υ(2S), and Υ(1S) states
- Creators
- Cronin-Hennessy, D.
- Gao, K. Y.
- Hietala, J.
- Kubota, Y.
- Klein, T.
- Lang, B. W.
- Poling, R.
- Scott, A. W.
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Smith, A.
- Zweber, P.
- Dobbs, S.
- Metreveli, Z.
- Seth, K. K.
- Tomaradze, A.
- Ernst, J.
- Ecklund, K. M.
- Severini, H.
- Love, W.
- Savinov, V.
- Lopez, A.
- Mehrabyan, S.
- Mendez, H.
- Ramirez, J.
- Huang, G. S.
- Miller, D. H.
- Pavlunin, V.
- Sanghi, B.
- Shipsey, I. P. J.
- Xin, B.
- Adams, G. S.
- Anderson, M.
- Cummings, J. P.
- Danko, I.
- Hu, D.
- Moziak, B.
- Napolitano, J.
- He, Q.
- Insler, J.
- Muramatsu, H.
- Park, C. S.
- Thorndike, E. H.
- Yang, F.
- Artuso, M.
- Blusk, S.
- Khalil, S.
- Li, J.
- Menaa, N.
- Mountain, R.
- Nisar, S.
- Randrianarivony, K.
- Sia, R.
- Skwarnicki, T.
- Stone, S.
- Wang, J. C.
- Bonvicini, G.
- Cinabro, D.
- Dubrovin, M.
- Lincoln, A.
- Pappas, S. P.
- Asner, D. M.
- Edwards, K. W.
- Naik, P.
- Briere, R. A.
- Ferguson, T.
- Tatishvili, G.
- Vogel, H.
- Watkins, M. E.
- Rosner, J. L.
- Adam, N. E.
- Alexander, J. P.
- Cassel, D. G.
- Duboscq, J. E.
- Ehrlich, R.
- Fields, L.
- Galik, R. S.
- Gibbons, L.
- Gray, R.
- Gray, S. W.
- Hartill, D. L.
- Heltsley, B. K.
- Hertz, D.
- Jones, C. D.
- Kandaswamy, J.
- Kreinick, D. L.
- Kuznetsov, V. E.
- Mahlke-Krüger, H.
- Mohapatra, D.
- Onyisi, P. U. E.
- Patterson, J. R.
- Peterson, D.
- Pivarski, J.
- Riley, D.
- Ryd, A.
- Sadoff, A. J.
- Schwarthoff, H.
- Shi, X.
- Stroiney, S.
- Sun, W. M.
- Wilksen, T.
- Athar, S. B.
- Patel, R.
- Yelton, J.
- Rubin, P.
- Cawlfield, C.
- Eisenstein, B. I.
- Karliner, I.
- Kim, D.
- Lowrey, N.
- Selen, M.
- White, E. J.
- Wiss, J.
- Mitchell, R. E.
- Shepherd, M. R.
- Besson, D.
- Pedlar, T. K.
-
Weinstein, Alan J.
- CLEO Collaboration
Abstract
We present measurements of decay matrix elements for hadronic transitions of the form Υ(nS)→Υ(mS)ππ, where (n,m)=(3,1),(2,1),(3,2). We reconstruct charged and neutral pion modes with the final state Upsilon decaying to either μ^+μ^- or e^+e^-. Dalitz plot distributions for the 12 decay modes are fit individually as well as jointly assuming isospin symmetry, thereby measuring the matrix elements of the decay amplitude. We observe and account for the anomaly previously noted in the dipion invariant mass distribution for the Υ(3S)→Υ(1S)ππ transition and obtain good descriptions of the dynamics of the decay using the most general decay amplitude allowed by partial conservation of the axial-vector current considerations. The fits further indicate that the Υ(2S)→Υ(1S)ππ and Υ(3S)→Υ(2S)ππ transitions also show the presence of terms in the decay amplitude that were previously ignored, although at a relatively suppressed level.
Additional Information
© 2007 The American Physical Society. Received 15 June 2007; published 4 October 2007. We gratefully acknowledge the effort of the CESR staff in providing us with excellent luminosity and running conditions. D. C.-H. and A. R. thank the A. P. Sloan Foundation. This work was supported by the National Science Foundation, the U.S. Department of Energy, and the Natural Sciences and Engineering Research Council of Canada.Attached Files
Published - CROprd07.pdf
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Additional details
- Eprint ID
- 17139
- Resolver ID
- CaltechAUTHORS:20100112-082432249
- NSF
- Department of Energy (DOE)
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- Alfred P. Sloan Foundation
- Created
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2010-01-12Created from EPrint's datestamp field
- Updated
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2021-11-08Created from EPrint's last_modified field