Search:
Computing and Library Services - delivering an inspiring information environment

Observation of the Bottomonium Ground State in the Decay Υ(3S)→γηb

Aubert, B. et al. (2008) Observation of the Bottomonium Ground State in the Decay Υ(3S)→γηb. Physical Review Letters, 101 (7). 071801. ISSN 0031-9007

Metadata only available from this repository.

Abstract

We report the results of a search for the bottomonium ground state ηb(1S) in the photon energy spectrum with a sample of (109±1) million of Υ(3S) recorded at the Υ(3S) energy with the BABAR detector at the PEP-II B factory at SLAC. We observe a peak in the photon energy spectrum at Eγ=921.2-2.8+2.1(stat)±2.4(syst) MeV with a significance of 10 standard deviations. We interpret the observed peak as being due to monochromatic photons from the radiative transition Υ(3S)→γηb(1S). This photon energy corresponds to an ηb(1S) mass of 9388.9-2.3+3.1(stat)±2.7(syst) MeV/c2. The hyperfine Υ(1S)-ηb(1S) mass splitting is 71.4-3.1+2.3(stat)±2.7(syst) MeV/c2. The branching fraction for this radiative Υ(3S) decay is estimated to be [4.8±0.5(stat)±1.2(syst)]×10-4.

Item Type: Article
Subjects: Q Science > QC Physics
Schools: School of Applied Sciences
Depositing User: Sharon Beastall
Date Deposited: 06 Apr 2011 11:41
Last Modified: 06 Apr 2011 11:41
URI: http://eprints.hud.ac.uk/id/eprint/10038

Item control for Repository Staff only:

View Item

University of Huddersfield, Queensgate, Huddersfield, HD1 3DH Copyright and Disclaimer All rights reserved ©