Speaker
Gian Michele Innocenti
(MIT)
Description
In this talk, we present the first measurement of $\mathrm{D}^0$ photoproduction in heavy ion ultraperipheral collisions (UPCs) using the data collected by CMS experiment during 2023 PbPb collisions at LHC. The measured production cross sections are presented as a function of the $\mathrm{D}^0$ transverse momentum (2<p$_T$<12 GeV/c) and rapidity (-2<y<2). The results are compared to theoretical calculations that exploit different modeling of the nuclear parton distribution functions (nPDFs) and provide new constraints into the properties of nuclear matter at low x and for Q$^2$ ranging from O(10) to O(100) GeV$^2$, in absence of significant final-state effects.
