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Feb 15 – 18, 2022
America/Vancouver timezone
WNPPC2022 Booklet has been added. See also information about today's special guest: Dr. Eden Hennessey

Two Photon and Radiation-less Decay of Positronium Molecule

Feb 16, 2022, 1:48 PM


Nuclear and Particle Physics Particle Physics


Muhammad Mubasher (University of Alberta)


It has been known for many years that an electron and its antiparticle, the positron, may together form a metastable hydrogen-like atom, known as positronium or Ps. In 1946, Wheeler speculated that two Ps atoms may combine to form the positronium molecule (Ps) stable with respect to auto-dissociation. In 2007 the existence of Ps was confirmed experimentally.
I will present a determination of the radiation-less and two photon decay rates of Ps. We employ a simple technique to compute the amplitudes and write the products of spinors in terms of gamma matrices, which reduces the computational time and provides more insights into the physics of a reaction. After testing the method with the well known problem of positronium, I will demonstrate that the previously published results are incorrect.

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Primary author

Muhammad Mubasher (University of Alberta)

Presentation materials