Nucleon Structure and Soft QCD from LHCb

Since the LHC reached the TeV scale in the high-energy hadron collisions, understanding of soft processes becomes inevitable for the constraining of the high-density regime of QCD. The measurement of the differential cross-section of prompt inclusive production of long-lived charged particles in proton-proton collisions at $\sqrt s=13$ TeV is performed by the LHCb experiment. The cross-section is evaluated as a function of transverse momentum and pseudorapidity and compared with the physics model used in current predictions. Comparison of the proton-proton and proton-lead collisions provides insights into the structure of the initial state. LHCb reports the determination of the nuclear modification factor at previously unexplored parton momentum fraction