Dominant electromagnetic correction to the energy-energy correlations in electron-positron annihilation

The emission of a hard photon by the electron or positron effectively puts the annihilation process in a moving frame. This mechanism causes an apparent correlation in the hadronic energy produced in the reaction. The dominant process involves the emission of a photon which is collinear with a lepton. We have calculated this contribution, which is of relative order α ln(W/m/sub e/), where α = 1/137, W is the total center-of-mass energy, and m/sub e/ is the electron mass. The size of this dominant contribution depends upon the experimental cuts made, but it is generally less than 15%