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

Aad, G; Abbott, B; Abdallah, J; Abdelalim, AA; Abdesselam, A; Abdinov, O; Abi, B; ... ATLAS Collaboration, The; + view all (2012) Observation of a new χ(b) state in radiative transitions to Υ(1S) and Υ(2S) at ATLAS. Physical Review Letters , 108 (15) , Article 152001. 10.1103/PhysRevLett.108.152001. Green open access

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Abstract

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.

Type: Article
Title: Observation of a new χ(b) state in radiative transitions to Υ(1S) and Υ(2S) at ATLAS.
Location: US
Open access status: An open access version is available from UCL Discovery
DOI: 10.1103/PhysRevLett.108.152001
Publisher version: http://dx.doi.org/10.1103/PhysRevLett.108.152001
Language: English
Additional information: © 2012 CERN, for the ATLAS Collaboration
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Computer Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy
URI: https://discovery.ucl.ac.uk/id/eprint/1346558
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