In particle physics, the acoplanarity of a scattering experiment is an event shape observable which measures the degree to which the paths of the scattered particles deviate from being coplanar. Measurements of acoplanarity provide a test of perturbative quantum chromodynamics (pQCD) because quantum chromodynamics (QCD) predicts that the emission of gluons can lead to acoplanar scattering events.
In particle physics, the acoplanarity of a scattering experiment is an event shape observable which measures the degree to which the paths of the scattered particles deviate from being coplanar. Measurements of acoplanarity provide a test of perturbative quantum chromodynamics (pQCD) because quantum chromodynamics (QCD) predicts that the emission of gluons can lead to acoplanar scattering events.
Source: Wikipedia "Acoplanarity" · CC BY-SA 4.0
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