Abstract
We propose to measure the toponium mass using an electromagnetic calorimeter of the “Crystal Ball” type at the LHC to detect t t bound states (toponium). If such a heavy system exists, the J PC =0 −+ state will dominate production at the LHC and could be observed above a relatively low background in the two-photon decay channel. The toponium mass could be measured for instance with a precision of 3×10 −4 for m t t =200 GeV/c 2 . This method provides an accuracy comparable with what will ultimately be obtained with future dedicated e +e − top-quark factories.
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