Photon correlations in positron annihilation
arXiv:1006.0665 · doi:10.1103/PhysRevA.81.062121
Abstract
The two-photon positron annihilation density matrix is found to separate into a diagonal center of energy factor implying maximally entangled momenta, and a relative factor describing decay. For unknown positron injection time, the distribution of the difference in photon arrival times is a double exponential at the para-Ps decay rate, consistent with experiment (V. D. Irby, Meas. Sci. Technol. 15, 1799 (2004)).
Accepted for publication in Phys. Rev. A