corner
corner
APS » Journals » Phys. Rev. Lett. » Volume 91 » Issue 26
< Previous Article | Next Article >

Phys. Rev. Lett. 91, 263401 (2003) [4 pages]

Search for CPT-Odd Decays of Positronium

Download: PDF (98 kB) Buy this article Export: BibTeX or EndNote (RIS)

P. A. Vetter* and S. J. Freedman
Department of Physics, University of California–Berkeley and Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA

Received 11 July 2003; published 23 December 2003

We have limited a CPT-violating correlation in annihilations of polarized ortho-positronium. We searched for an asymmetry in the triple correlation s⃗·(k⃗1×k⃗2), where k⃗1 and k⃗2 are the two largest photon momenta, and s⃗ is the spin of the positronium. Using the Gammasphere array of Compton-suppressed high-purity germanium detectors, we detected 2.65×107 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.

© 2003 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.91.263401
DOI:
10.1103/PhysRevLett.91.263401
PACS:
36.10.Dr, 11.30.Er, 24.80.+y

*Electronic address: pavetter@lbl.gov

 
< Previous Article | Next Article >