Observation of a New X-b State in Radiative Transitions to Y(1S) and Y(2S) at ATLAS

Jones, Roger and Chilingarov, Alexandre and Hughes, Gareth and Kartvelishvili, Vakhtang and Smizanska, Maria and Bouhova-Thacker, Evelina and Davidson, Ruth and Fox, Harald and Borissov, Guennadi and Price, Darren and Love, Peter and Cheatham, Sue and Catmore, James and Walder, James and Burke, Stephen and Long, Robin and Barton, Adam (2012) Observation of a New X-b State in Radiative Transitions to Y(1S) and Y(2S) at ATLAS. Physical review letters, 108 (15). ISSN 1079-7114

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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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Journal Article
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Physical review letters
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Published by the American Physical Society under the terms of the Creative Commons Attribution 3.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. © 2012 CERN, for the ATLAS Collaboration
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18 Sep 2012 11:53
Last Modified:
09 Jul 2020 02:46