Sigmajj
Sigmajj (often written as sigma_jj) is a term used in high-energy physics to denote the dijet production cross section, i.e., the probability for two jets to be produced in a hadronic collision. In proton-proton or proton-antiproton collisions, sigma_jj depends on the kinematic properties of the jets and is commonly expressed as differential cross sections such as d sigma_jj / d m_jj, where m_jj is the invariant mass of the two leading jets, or d sigma_jj / d p_T1 d y1 d p_T2 d y2 for the transverse momenta and rapidities of the jets.
Experimental measurement involves selecting events with at least two jets using a jet algorithm (for example
Sigmajj is used to test QCD at high energies, constrain parton distribution functions, and search for new