Speaker
Description
$J/\psi-$pair production at the LHC is currently the best tool available to probe gluon transverse momentum distributions (TMDs) which are very poorly known today. Data from LHCb at low transverse momentum are already available and more are expected soon from CMS and LHCb. Such data in the collider mode will allow one to probe the evolution of the unpolarised-gluon TMDs and to measure, for the first time, the distribution of the linearly polarised gluon in unpolarised protons. In addition, data in the fixed-target mode will give us some handle to measure the momentum-fraction dependence of the TMDs.
In this talk, I will present improved results obtained for the LHC in collider mode ($\sqrt{s}$=13 TeV) up to NLL in TMD factorisation and present first results for the LHCb in the fixed-target mode ($\sqrt{s}$=115 GeV).
After showing a comparison with the existing LHCb data, I will discuss predictions of transverse-momentum distributions at different invariant masses that could be measured by LHCb and CMS in the collider mode. I will then present predictions for the azimuthal modulations of the cross section that arise from linearly polarised gluons.
| Collaboration / Activity | Yes |
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