Observation of a new χ(b) state in radiative transitions to Υ(1S) and Υ(2S) at ATLAS.

Journal article

The χ(b)(nP) quarkonium states are produced in proton-proton collisions at the Large Hadron Collider at sqrt[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 χ(b)(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 χ(b)(3P) system.

Authors: Aad, G; Abbott, B; Abdallah, J; Abdelalim, A; Abdesselam, A

• Publication status: Published
• Journal: Physical Review Letters
• Volume: 108
• Issue: 15
• Pages: 152001
• Publication date: 2012-04-01
• DOI: 10.1103/physrevlett.108.152001
• EISSN: 1079-7114
• ISSN: 0031-9007
• Language: English
• Keywords: ATLAS Collaboration