Abstract
The quarkonium states are produced in proton-proton collisions at the Large Hadron Collider at and recorded by the ATLAS detector. Using a data sample corresponding to an integrated luminosity of , these states are reconstructed through their radiative decays to with . In addition to the mass peaks corresponding to the decay modes , a new structure centered at a mass of is also observed, in both the and decay modes. This structure is interpreted as the system.
- Received 21 December 2011
DOI:https://doi.org/10.1103/PhysRevLett.108.152001
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© 2012 CERN, for the ATLAS Collaboration