Observation of a New<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>χ</mml:mi><mml:mi>b</mml:mi></mml:msub></mml:math>State in Radiative Transitions to<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>Υ</mml:mi><mml:mo stretchy="false">(</mml:mo><mml:mn>1</mml:mn><mml:mi>S</mml:mi><mml:mo stretchy="false">)</mml:mo></mml:math>and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>Υ</mml:mi><mml:mo stretchy="false">(</mml:mo><mml:mn>2</mml:mn><mml:mi>S</mml:mi><mml:mo stretchy="false">)</mml:mo></mml:math>at ATLAS

The ${\ensuremath{\chi}}_{b}(nP)$ quarkonium states are produced in proton-proton collisions at the Large Hadron Collider at $\sqrt{s}=7\text{ }\text{ }\mathrm{TeV}$ and recorded by the ATLAS detector. Using a data sample corresponding to an integrated luminosity of $4.4\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$, these states are reconstructed through their radiative decays to $\ensuremath{\Upsilon}(1S,2S)$ with $\ensuremath{\Upsilon}\ensuremath{\rightarrow}{\ensuremath{\mu}}^{+}{\ensuremath{\mu}}^{\ensuremath{-}}$. In addition to the mass peaks corresponding to the decay modes ${\ensuremath{\chi}}_{b}(1P,2P)\ensuremath{\rightarrow}\ensuremath{\Upsilon}(1S)\ensuremath{\gamma}$, a new structure centered at a mass of $10.530\ifmmode\pm\else\textpm\fi{}0.005(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.009(\mathrm{syst})\text{ }\text{ }\mathrm{GeV}$ is also observed, in both the $\ensuremath{\Upsilon}(1S)\ensuremath{\gamma}$ and $\ensuremath{\Upsilon}(2S)\ensuremath{\gamma}$ decay modes. This structure is interpreted as the ${\ensuremath{\chi}}_{b}(3P)$ system.

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