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Quark Matter / Searching for the gluon saturation scale at $x \sim 10^-5$ with the LHCb detector using direct photons

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}Copyright © 2010 - 2024 LHCb Collaboration