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arXiv · 1012.0589

Measurements of branching fractions for electromagnetic transitions involving the $\chi_{bJ}(1P)$ states

The CLEO Collaboration·M. Kornicer·R. E. Mitchell·C. M. Tarbert·D. Besson·T. K. Pedlar·D. Cronin-Hennessy·J. Hietala·P. Zweber·S. Dobbs·Z. Metreveli·K. K. Seth·A. Tomaradze·T. Xiao·S. Brisbane·L. Martin·A. Powell·P. Spradlin·G. Wilkinson·H. Mendez·J. Y. Ge·D. H. Miller·I. P. J. Shipsey·B. Xin·G. S. Adams·D. Hu·B. Moziak·J. Napolitano·K. M. Ecklund·J. Insler·H. Muramatsu·C. S. Park·L. J. Pearson·E. H. Thorndike·F. Yang·S. Ricciardi·C. Thomas·M. Artuso·S. Blusk·R. Mountain·T. Skwarnicki·S. Stone·J. C. Wang·L. M. Zhang·G. Bonvicini·D. Cinabro·A. Lincoln·M. J. Smith·P. Zhou·J. Zhu·P. Naik·J. Rademacker·D. M. Asner·K. W. Edwards·K. Randrianarivony·G. Tatishvili·R. A. Briere·H. Vogel·P. U. E. Onyisi·J. L. Rosner·J. P. Alexander·D. G. Cassel·S. Das·R. Ehrlich·L. Fields·L. Gibbons·S. W. Gray·D. L. Hartill·B. K. Heltsley·D. L. Kreinick·V. E. Kuznetsov·J. R. Patterson·D. Peterson·D. Riley·A. Ryd·A. J. Sadoff·X. Shi·W. M. Sun·J. Yelton·P. Rubin·N. Lowrey·S. Mehrabyan·M. Selen·J. Wiss·J. Libby
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Abstract

Using 9.32, 5.88 million Upsilon(2S,3S) decays taken with the CLEO-III detector, we obtain five product branching fractions for the exclusive processes Upsilon(2S) => gamma chi_{b0,1,2}(1P) => gamma gamma Upsilon(1S) and Upsilon(3S) => gamma chi_{b1,2}(1P) => gamma gamma Upsilon(1S). We observe the transition chi_{b0}(1P) => gamma Upsilon(1S) for the first time. Using the known branching fractions for B[Upsilon(2S) => gamma chi_{bJ}(1P)], we extract values for B[chi_{bJ}(1P) => gamma Upsilon(1S)] for J=0, 1, 2. In turn, these values can be used to unfold the Upsilon(3S) product branching fractions to obtain values for B[Upsilon(3S) => gamma chi_{b1,2}(1P) for the first time individually. Comparison of these with each other and with the branching fraction B[Upsilon(3S) => gamma chi_{b0}] previously measured by CLEO provides tests of relativistic corrections to electric dipole matrix elements.

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The CLEO Collaboration, M. Kornicer, R. E. Mitchell, C. M. Tarbert, D. Besson, T. K. Pedlar, D. Cronin-Hennessy, J. Hietala, P. Zweber, S. Dobbs, Z. Metreveli, K. K. Seth, A. Tomaradze, T. Xiao, S. Brisbane, L. Martin, A. Powell, P. Spradlin, G. Wilkinson, H. Mendez, J. Y. Ge, D. H. Miller, I. P. J. Shipsey, B. Xin, G. S. Adams, D. Hu, B. Moziak, J. Napolitano, K. M. Ecklund, J. Insler, H. Muramatsu, C. S. Park, L. J. Pearson, E. H. Thorndike, F. Yang, S. Ricciardi, C. Thomas, M. Artuso, S. Blusk, R. Mountain, T. Skwarnicki, S. Stone, J. C. Wang, L. M. Zhang, G. Bonvicini, D. Cinabro, A. Lincoln, M. J. Smith, P. Zhou, J. Zhu, P. Naik, J. Rademacker, D. M. Asner, K. W. Edwards, K. Randrianarivony, G. Tatishvili, R. A. Briere, H. Vogel, P. U. E. Onyisi, J. L. Rosner, J. P. Alexander, D. G. Cassel, S. Das, R. Ehrlich, L. Fields, L. Gibbons, S. W. Gray, D. L. Hartill, B. K. Heltsley, D. L. Kreinick, V. E. Kuznetsov, J. R. Patterson, D. Peterson, D. Riley, A. Ryd, A. J. Sadoff, X. Shi, W. M. Sun, J. Yelton, P. Rubin, N. Lowrey, S. Mehrabyan, M. Selen, J. Wiss, J. Libby. 2010-12-02. Measurements of branching fractions for electromagnetic transitions involving the $\chi_{bJ}(1P)$ states. https://doi.org/10.1103/physrevd.83.054003

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