Speaker
Description
The exclusive photoproduction of $\Upsilon$ and $\rho$ meson is studied in ultraperipheral pPb collisions at $\sqrt{s_{NN}} = 5.02$ TeV. The differential cross-section of $\Upsilon$ and $\rho$ meson has been measured as a function of transverse momentum squared $p_{T}^{2}$, and rapidity $y$. The slope of the squared transverse momentum ($p_{T}^{2}$) dependent differential cross section is extracted to determine the size of the production region. Also, we measured the $\Upsilon$ and $\rho$ photoproduction cross-section as a function of the photon-proton centre-of-mass energies $W_{\gamma p}$, which provides valuable information of the gluon distribution at small values of parton fractional momenta $x$. The results are compared to various theoretical predictions and to previous measurements.
