  Production of electroweak bosons, heavy quarks and jets in proton-proton
collisions probe different aspects of QCD and are sensitive to the details of
proton structure, expressed by parton distribution functions (PDFs). Precise
measurements of cross sections of these processes are used by the CMS
experiment to demonstrate the impact of the LHC data on the PDFs and their
precision. The measurements of muon charge asymmetry in W-boson production at a
center-of-mass of 7 and 8 TeV is used to improve the constraints on the
valence-quark distributions, while the associated production of W-boson and
charm quark provides information on the s-quark distribution in the proton.
Production of inclusive jets, as measured by CMS at center-of-mass energy of 7
TeV, provides important constraints on the gluon distribution.
