Measurement of the eta_b(1S) mass and the branching fraction for Upsilon(3S) --> gamma eta_b(1S)
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) --> ga...
| Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , , |
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| Format: | Journal article |
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2009
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| _version_ | 1797094126700724224 |
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| author | Collaboration, TCLEO Bonvicini, G Cinabro, D Lincoln, A Smith, M Zhou, P Zhu, J Naik, P Rademacker, J Asner, D Edwards, K Reed, J Robichaud, A Tatishvili, G White, E Briere, R Vogel, H Onyisi, P Rosner, J Alexander, J Cassel, D Ehrlich, R Fields, L Galik, R Gibbons, L |
| author_facet | Collaboration, TCLEO Bonvicini, G Cinabro, D Lincoln, A Smith, M Zhou, P Zhu, J Naik, P Rademacker, J Asner, D Edwards, K Reed, J Robichaud, A Tatishvili, G White, E Briere, R Vogel, H Onyisi, P Rosner, J Alexander, J Cassel, D Ehrlich, R Fields, L Galik, R Gibbons, L |
| author_sort | Collaboration, TCLEO |
| collection | OXFORD |
| description | 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 MeV/c^2. Using 9 million Upsilon(2S) decays, we place an upper limit on the corresponding Y(2S) decay, B(Y(2S) --> gamma eta_b) < 8.4 X 10^{-4} at 90 % confidence level. |
| first_indexed | 2024-03-07T04:09:49Z |
| format | Journal article |
| id | oxford-uuid:c77512c1-5c0c-493d-b4b0-c258973d4078 |
| institution | University of Oxford |
| last_indexed | 2024-03-07T04:09:49Z |
| publishDate | 2009 |
| record_format | dspace |
| spelling | oxford-uuid:c77512c1-5c0c-493d-b4b0-c258973d40782022-03-27T06:45:15ZMeasurement of the eta_b(1S) mass and the branching fraction for Upsilon(3S) --> gamma eta_b(1S)Journal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:c77512c1-5c0c-493d-b4b0-c258973d4078Symplectic Elements at Oxford2009Collaboration, TCLEOBonvicini, GCinabro, DLincoln, ASmith, MZhou, PZhu, JNaik, PRademacker, JAsner, DEdwards, KReed, JRobichaud, ATatishvili, GWhite, EBriere, RVogel, HOnyisi, PRosner, JAlexander, JCassel, DEhrlich, RFields, LGalik, RGibbons, LWe 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 MeV/c^2. Using 9 million Upsilon(2S) decays, we place an upper limit on the corresponding Y(2S) decay, B(Y(2S) --> gamma eta_b) < 8.4 X 10^{-4} at 90 % confidence level. |
| spellingShingle | Collaboration, TCLEO Bonvicini, G Cinabro, D Lincoln, A Smith, M Zhou, P Zhu, J Naik, P Rademacker, J Asner, D Edwards, K Reed, J Robichaud, A Tatishvili, G White, E Briere, R Vogel, H Onyisi, P Rosner, J Alexander, J Cassel, D Ehrlich, R Fields, L Galik, R Gibbons, L Measurement of the eta_b(1S) mass and the branching fraction for Upsilon(3S) --> gamma eta_b(1S) |
| title | Measurement of the eta_b(1S) mass and the branching fraction for
Upsilon(3S) --> gamma eta_b(1S) |
| title_full | Measurement of the eta_b(1S) mass and the branching fraction for
Upsilon(3S) --> gamma eta_b(1S) |
| title_fullStr | Measurement of the eta_b(1S) mass and the branching fraction for
Upsilon(3S) --> gamma eta_b(1S) |
| title_full_unstemmed | Measurement of the eta_b(1S) mass and the branching fraction for
Upsilon(3S) --> gamma eta_b(1S) |
| title_short | Measurement of the eta_b(1S) mass and the branching fraction for
Upsilon(3S) --> gamma eta_b(1S) |
| title_sort | measurement of the eta b 1s mass and the branching fraction for upsilon 3s gt gamma eta b 1s |
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