Speaker
Description
We consider the QCD predictions for spin correlations in ttbar production at the LHC and argue that, for the observables usually considered for searches close to threshold production, it is possible to perform the calculation using perturbation theory, considering only the contributions that scale as the first few powers of alphas/v. Implementing such strategy to correct nominal Monte Carlo results for correlation-sensitive observables, we show that results obtained are compatible with data, and, more specifically, that the contribution from ttbar bound states (toponium), while being present also in our study, does not seem to be crucially important to get agreement with data.
The content of the talk will be based mostly on https://arxiv.org/abs/2505.00096
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