Hard QCD results on jets and photons at CMS

The Compact Muon Solenoid (CMS) is one of the two large multipurpose experiments at the LHC. CMS has been successfully operating since the start-up of the LHC, and has recorded in 2010 around 1 billion of the most interesting proton-proton collisions out of the approximately 3 trillion ($3\times10^{12}$) provided by the LHC. The accumulated data has been used to perform stringent test of the Standard Model of particle physics, and to search for signs of new physics. Here we report on the first year (2010) jet results from the 3.5+3.5 TeV proton-proton run, with some updates from 2011, focusing on probes of hard QCD. The highlights of the first year of jet measurements in proton-proton collisions include precise determination of the jet energy scale, measurements of inclusive jet production, inclusive b-jet production and isolated prompt photon production, hadronic event shapes, dijet azimuthal decorrelations and dijet angular distributions. These measurements have validated the experimental techniques and theoretical models used at CMS. They have also extended the energy reach beyond previous experiments, and have paved the road for discoveries of new physical phenomena.