Speaker
Description
We present a study of next-to-leading-order (NLO) QCD corrections to double heavy-quarkonium hadroproduction within the nonrelativistic QCD factorization framework. We focus on the color-singlet (CS) contribution to prompt (J/\psi)-pair production at the CERN Large Hadron Collider and compare our predictions with measurements from the LHCb, CMS, and ATLAS collaborations. The NLO CS contribution describes the LHCb data well in most experimental bins, except in kinematic regions where soft or hard-collinear gluon radiation compromises the reliability of fixed-order calculations. For CMS and ATLAS, however, the predicted total and differential cross sections remain substantially below the measurements, despite sizable NLO enhancements, with total-cross-section (K) factors of 2–3. We also briefly discuss (\Upsilon)-pair production, extending the discussion to the bottomonium sector. These results highlight the importance and limitations of the NLO CS contribution in describing double heavy-quarkonium production across different kinematic regimes.
