{"paper":{"title":"Measurement of the eta_b(1S) mass and the branching fraction for Upsilon(3S) --> gamma eta_b(1S)","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"hep-ex","authors_text":"A. J. Sadoff, A. Lincoln, A. N. Robichaud, A. Powell, A. Ryd, A. Tomaradze, B. J. Y. Tan, B. K. Heltsley, B. Moziak, B. Xin, C. M. Tarbert, C. S. Park, C. Thomas, D. Besson, D. Cinabro, D. Cronin-Hennessy, D. G. Cassel, D. H. Miller, D. Hu, D. L. Hartill, D. L. Kreinick, D. M. Asner, D. Peterson, D. Riley, E. H. Thorndike, E. J. White, F. Yang, G. S. Adams, G. Tatishvili, G. Wilkinson, H. Mahlke-Kr\\\"uger, H. Mendez, H. Muramatsu, H. Vogel, I. P. J. Shipsey, J. C. Wang, J. Hietala, J. Insler, J. Ledoux, J. Libby, J. L. Rosner, J. M. Hunt, J. Napolitano, J. P. Alexander, J. Rademacker, J. Reed, J. R. Patterson, J. Wiss, J. Xavier, J. Yelton, J. Y. Ge, J. Zhu, K. K. Seth, K. M. Ecklund, K. Randrianarivony, K. W. Edwards, K. Y. Gao, L. Fields, L. Gibbons, L. Martin, L. M. Zhang, M. Artuso, M. J. Smith, M. Kornicer, M. R. Shepherd, M. Selen, N. Lowrey, P. Naik, P. Rubin, P. Spradlin, P. U. E. Onyisi, P. Zhou, P. Zweber, R. A. Briere, R. Ehrlich, R. E. Mitchell, R. Mountain, R. Poling, R. S. Galik, S. Blusk, S. Brisbane, S. Dobbs, S. Khalil, S. Mehrabyan, S. Stroiney, S. W. Gray, The CLEO Collaboration: G. Bonvicini, T. K. Pedlar, T. Skwarnicki, V. E. Kuznetsov, W. M. Sun, X. Shi, Z. Metreveli","submitted_at":"2009-09-30T01:34:43Z","abstract_excerpt":"We report evidence for the ground state of bottomonium, eta_b(1S), in the radiative decay Upsilon(3S) --> gamma eta_b in e^+e^- annihilation data taken with the CLEO III detector. Using 6 million Upsilon(3S) decays, and assuming Gamma(eta_b) = 10 MeV/c^2, we obtain B(Upsilon(3S) --> gamma eta_b) = (7.1 +- 1.8 +- 1.1) X 10^{-4}, where the first error is statistical and the second is systematic. The statistical significance is about 4 sigma. The mass is determined to be M(eta_b) = 9391.8 +- 6.6 +- 2.0 MeV/c^2, which corresponds to the hyperfine splitting Delta M_{hf}(1S)_b = 68.5 +- 6.6 +- 2.0 M"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0909.5474","kind":"arxiv","version":2},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/0909.5474/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"}