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

• Main Author: Taylor, Frank E. (Contributor)
• Other Authors: Massachusetts Institute of Technology. Department of Physics (Contributor)
• Format: Article
• Language: English
• Published: American Physical Society, 2012-07-11T15:17:40Z.
• Subjects: Article
• Online Access: Get fulltext

The [subscript 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[superscript -1], these states are reconstructed through their radiative decays to Υ(1S,2S) with Υ→μ[superscript +]μ[superscript -]. 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 [subscript χb](3P) system.