Search for CPT-odd decays of positronium

We have limited a CPT-violating correlation in annihilations of polarized ortho-positronium. We searched for an asymmetry in the triple correlation s-->.(k-->(1)xk-->(2)), where k-->(1) and k-->(2) are the two largest photon momenta, and s--> is the spin of the positronium. Using t...

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Published in:Physical review letters 2003-12, Vol.91 (26 Pt 1), p.263401-263401
Main Authors: Vetter, P A, Freedman, S J
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Freedman, S J
description We have limited a CPT-violating correlation in annihilations of polarized ortho-positronium. We searched for an asymmetry in the triple correlation s-->.(k-->(1)xk-->(2)), where k-->(1) and k-->(2) are the two largest photon momenta, and s--> is the spin of the positronium. Using the Gammasphere array of Compton-suppressed high-purity germanium detectors, we detected 2.65x10(7) events of ortho-Ps annihilation. The amplitude of a CPT-violating asymmetry in the data set is found to be 0.0026+/-0.0031, a factor of 6 smaller than previous experiments.
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title Search for CPT-odd decays of positronium
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