Evidence for the ηb(1S) Meson in Radiative Υ(2S) Decay
We have performed a search for the η b ( 1 S ) meson in the radiative decay of the Υ ( 2 S ) resonance using a sample of 91.6 × 10 6 Υ ( 2 S ) events recorded with the BABAR detector at the PEP-II B factory at the SLAC National Accelerator Laboratory. We observe a peak in the photon energy spectrum...
| Authors: | ; ; |
|---|---|
| Format: | Article |
| Status: | Published version |
| Publication date: | 2009 |
| Country: | España |
| Institution: | Universidad de Barcelona |
| Repository: | Dipòsit Digital de la UB |
| OAI Identifier: | oai:diposit.ub.edu:2445/138338 |
| Online Access: | https://hdl.handle.net/2445/138338 |
| Access Level: | Open access |
| Keyword: | Física de partícules Experiments Particle physics |
| _version_ | 1878739665872224256 |
|---|---|
| author | Garra Ticó, Jordi |
| author2 | Graugés Pous, Eugeni BABAR Collaboration |
| author2_role | author author |
| author_browse | BABAR Collaboration Garra Ticó, Jordi Graugés Pous, Eugeni |
| author_facet | Garra Ticó, Jordi Graugés Pous, Eugeni BABAR Collaboration |
| author_role | author |
| collection | Dipòsit Digital de la UB |
| description | We have performed a search for the η b ( 1 S ) meson in the radiative decay of the Υ ( 2 S ) resonance using a sample of 91.6 × 10 6 Υ ( 2 S ) events recorded with the BABAR detector at the PEP-II B factory at the SLAC National Accelerator Laboratory. We observe a peak in the photon energy spectrum at E γ = 609.3 + 4.6 − 4.5 ( stat ) ± 1.9 ( syst ) MeV , corresponding to an η b ( 1 S ) mass of 9394.2 + 4.8 − 4.9 ( stat ) ± 2.0 ( syst ) MeV / c 2 . The branching fraction for the decay Υ ( 2 S ) → γ η b ( 1 S ) is determined to be [ 3.9 ± 1.1 ( stat ) + 1.1 − 0.9 ( syst ) ] × 10 − 4 . We find the ratio of branching fractions B [ Υ ( 2 S ) → γ η b ( 1 S ) ] / B [ Υ ( 3 S ) → γ η b ( 1 S ) ] = 0.82 ± 0.24 ( stat ) + 0.20 − 0.19 ( syst ) . |
| eu_rights_str_mv | openAccess |
| format | article |
| id | ES_c5c049fa32bbdfd0bcbd06039a057cd2 |
| institution | Universidad de Barcelona |
| instname_str | Universidad de Barcelona |
| network_acronym_str | ES |
| network_name_str | España |
| oai_identifier_str | oai:diposit.ub.edu:2445/138338 |
| publishDate | 2009 |
| publishDateSort | 2009 |
| publisher | American Physical Society |
| publisherStr | American Physical Society |
| reponame_str | Dipòsit Digital de la UB |
| spelling | Evidence for the ηb(1S) Meson in Radiative Υ(2S) Decay Garra Ticó, Jordi Graugés Pous, Eugeni BABAR Collaboration Física de partícules Experiments Particle physics We have performed a search for the η b ( 1 S ) meson in the radiative decay of the Υ ( 2 S ) resonance using a sample of 91.6 × 10 6 Υ ( 2 S ) events recorded with the BABAR detector at the PEP-II B factory at the SLAC National Accelerator Laboratory. We observe a peak in the photon energy spectrum at E γ = 609.3 + 4.6 − 4.5 ( stat ) ± 1.9 ( syst ) MeV , corresponding to an η b ( 1 S ) mass of 9394.2 + 4.8 − 4.9 ( stat ) ± 2.0 ( syst ) MeV / c 2 . The branching fraction for the decay Υ ( 2 S ) → γ η b ( 1 S ) is determined to be [ 3.9 ± 1.1 ( stat ) + 1.1 − 0.9 ( syst ) ] × 10 − 4 . We find the ratio of branching fractions B [ Υ ( 2 S ) → γ η b ( 1 S ) ] / B [ Υ ( 3 S ) → γ η b ( 1 S ) ] = 0.82 ± 0.24 ( stat ) + 0.20 − 0.19 ( syst ) . American Physical Society https://hdl.handle.net/2445/138338 |
| spellingShingle | Evidence for the ηb(1S) Meson in Radiative Υ(2S) Decay Garra Ticó, Jordi Física de partícules Experiments Particle physics |
| status_str | publishedVersion |
| title | Evidence for the ηb(1S) Meson in Radiative Υ(2S) Decay |
| title_full | Evidence for the ηb(1S) Meson in Radiative Υ(2S) Decay |
| title_fullStr | Evidence for the ηb(1S) Meson in Radiative Υ(2S) Decay |
| title_full_unstemmed | Evidence for the ηb(1S) Meson in Radiative Υ(2S) Decay |
| title_short | Evidence for the ηb(1S) Meson in Radiative Υ(2S) Decay |
| title_sort | Evidence for the ηb(1S) Meson in Radiative Υ(2S) Decay |
| topic | Física de partícules Experiments Particle physics |
| topic_facet | Física de partícules Experiments Particle physics |
| url | https://hdl.handle.net/2445/138338 |