Observation of the Bottomonium Ground State, eta_b, at BaBar

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The authors present the first observation of the bottomonium ground state {eta}{sub b}(1S) in the photon energy spectrum using a sample of (109 {+-} 1) million of {Upsilon}(3S) events recorded at the {Upsilon}(3S) energy with the BaBar detector at the PEP-II B factory at SLAC. A peak at E{sub {gamma}} = 921.2{sub -2.8}{sup +2.1}(stat) {+-} 2.4(syst) MeV observed with a significance of 10 standard deviations in the photon energy spectrum is interpreted as being due to the radiative transition {Upsilon}(3S) {yields} {gamma} {eta}{sub b}(1S). This photon energy corresponds to an {eta}{sub b}(1S) mass of 9388.9{sub -2.3}{sup +3.1}(stat) {+-} 2.7(syst) MeV/c{sup ... continued below

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6 pages

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Grenier, Philippe & Collaboration, for the BABAR September 9, 2008.

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Description

The authors present the first observation of the bottomonium ground state {eta}{sub b}(1S) in the photon energy spectrum using a sample of (109 {+-} 1) million of {Upsilon}(3S) events recorded at the {Upsilon}(3S) energy with the BaBar detector at the PEP-II B factory at SLAC. A peak at E{sub {gamma}} = 921.2{sub -2.8}{sup +2.1}(stat) {+-} 2.4(syst) MeV observed with a significance of 10 standard deviations in the photon energy spectrum is interpreted as being due to the radiative transition {Upsilon}(3S) {yields} {gamma} {eta}{sub b}(1S). This photon energy corresponds to an {eta}{sub b}(1S) mass of 9388.9{sub -2.3}{sup +3.1}(stat) {+-} 2.7(syst) MeV/c{sup 2}. The hyperfine {Upsilon}(1S)-{eta}{sub b}(1S) mass splitting is 71.4{sub -3.1}{sup +2.3}(stat) {+-} 2.7(syst) MeV/c{sup 2}. The branching fraction for this radiative {Upsilon}(3S) decay is obtained as (4.8 {+-} 0.5(stat) {+-} 1.2(syst)) x 10{sup -4}.

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6 pages

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  • Invited talk at 34th International Conference on High Energy Physics (ICHEP 2008), Philadelphia, Pennsylvania, 30 Jul - 5 Aug 2008

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  • Report No.: SLAC-PUB-13384
  • Grant Number: AC02-76SF00515
  • Office of Scientific & Technical Information Report Number: 937170
  • Archival Resource Key: ark:/67531/metadc897160

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  • September 9, 2008

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  • Sept. 27, 2016, 1:39 a.m.

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  • Nov. 30, 2016, 2:06 p.m.

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Grenier, Philippe & Collaboration, for the BABAR. Observation of the Bottomonium Ground State, eta_b, at BaBar, article, September 9, 2008; [Menlo Park, California]. (digital.library.unt.edu/ark:/67531/metadc897160/: accessed September 25, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.