Observation of a new χb state in radiative transitions to Υ(1S) and Υ(2S) at ATLAS
ATLAS Collaboration (Including: Farrington, Sinead). (2012) Observation of a new χb state in radiative transitions to Υ(1S) and Υ(2S) at ATLAS. Physical Review Letters, Vol.108 (No.15). p. 152001. ISSN 0031-9007
WRAP_Farrington_radiative_transitions_2012.pdf - Published Version
Available under License Creative Commons Attribution.
Official URL: http://dx.doi.org/10.1103/PhysRevLett.108.152001
The χb(nP) quarkonium states are produced in proton-proton collisions at the Large Hadron Collider at √s=7 TeV and recorded by the ATLAS detector. Using a data sample corresponding to an integrated luminosity of 4.4 fb-1, these states are reconstructed through their radiative decays to Υ(1S,2S) with Υ→μ+μ-. In addition to the mass peaks corresponding to the decay modes χb(1P,2P)→Υ(1S)γ, a new structure centered at a mass of 10.530±0.005(stat)±0.009(syst) GeV is also observed, in both the Υ(1S)γ and Υ(2S)γ decay modes. This structure is interpreted as the χb(3P) system.
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