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

G. Aad et al. (ATLAS Collaboration)
Phys. Rev. Lett. 108, 152001 – Published 9 April 2012

Abstract

The χb(nP) quarkonium states are produced in proton-proton collisions at the Large Hadron Collider at s=7TeV and recorded by the ATLAS detector. Using a data sample corresponding to an integrated luminosity of 4.4fb1, these states are reconstructed through their radiative decays to Υ(1S,2S) with Υμ+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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  • Received 21 December 2011

DOI:https://doi.org/10.1103/PhysRevLett.108.152001

This article is available 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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Vol. 108, Iss. 15 — 13 April 2012

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