Electron-positron pair production in Coulomb collisions by 6.4-TeV sulfur ions

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Abstract
Angular and momentum distributions have been measured for electron-positron pairs created in peripheral collisions of 6.4-TeV bare sulfur ions with thin targets of Al, Pd, and Au. Singly and doubly differential cross sections are presented for 1–17 MeV/c electrons and positrons detected independently and in coincidence as pairs. Integrated yields for pair production are found to vary as the square of the target nuclear charge. Relative angular and momentum differential cross sections are effectively target independent. Various physical parameters are deduced from the coincident electron and positron data, including probability distributions for the pair transverse momentum, the pair total energy, and the positron fraction of the pair energy. Where possible, results of these measurements are compared with theory.

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