Charmonia photo-production in ultra-peripheral and peripheral PbPb collisions with LHCb
Abstract
The LHCb recorded 210 μ b-1 integrated luminosity of PbPb collisions at sNN = 5.02 TeV in 2018. With an increase of the luminosity by a factor of 20 compared to the previous 2015 PbPb dataset, precise measurements on photo-produced charmonia in ultra-peripheral collisions are now possible. Moreover, the great momentum resolution of the detector allows photo-produced J/ in collisions with a nuclear overlap to be studied. This new type of probe is sensitive to the geometry of the collisions but also to the electromagnetic field of the Pb nuclei. In this contribution, we present the latest results on J/ photo-production measured by LHCb in peripheral and ultra-peripheral PbPb collisions.
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