Speaker
Description
Because of the increasing gluon density towards small-$x$, a regime where these densities reach a saturation ($Q_{\rm sat}$) is expected. The observation of this gluon saturated matter has several consequences to particle production and is a matter of an entire effective field theory, the Color Glass Condensate. The Large Hadron Collider beauty (LHCb) experiment has a privileged geometry for the search of the gluon saturation achieving an unprecedent small-$x$ coverage. The most direct measurement of gluon densities and kinematics in hadronic collisions is the inverse Compton process $(q+g\rightarrow \gamma+q)$. The LHCb experiment measured pairs of isolated photons correlated with hadrons from the quark fragmentation in pPb and Pbp collisions at 8.16 TeV probing a Bjorken-$x$ between $10^{-5}<x<10^{-1}$ with a scale down to 5 GeV$^2$, well below the expected lower-limit $Q_{\rm sat}$ in Pb nucleus. This poster will detail the measurement and discuss it in the scope of the gluon saturation and competing effects such as partonic shadowing. A discussion on future LHCb upgrades towards the extension of the gluon saturation search will also be presented.