Speaker
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). Additionally, we will present new results from a much larger data sample from 2024 PbPb UPCs, which could significantly improve the data precision and extend the measurements to zero $p_T$. 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 down to $x~10^{-4}$ and for Q^2 ranging from O(10) to O(100) GeV$^2$, in absence of significant final-state effects.
| Category | Experiment |
|---|---|
| Collaboration (if applicable) | CMS |
