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Observation of a New χb State in Radiative Transitions to Υ(1S) and Υ(2S) at ATLAS

ContributorsATLAS Collaboration
Published inPhysical review letters, vol. 108, no. 15, 152001
Publication date2012
Abstract

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.

Citation (ISO format)
ATLAS Collaboration. Observation of a New <em>χ<sub>b</sub></em> State in Radiative Transitions to Υ(1<em>S</em>) and Υ(2<em>S</em>) at ATLAS. In: Physical review letters, 2012, vol. 108, n° 15, p. 152001. doi: 10.1103/PhysRevLett.108.152001
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ISSN of the journal0031-9007
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