Past electron-positron g-2 experiments yielded sharpest bound on CPT violation

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Abstract
In our past experiments on a single electron and positron we measured the cyclotron and spin-cyclotron difference frequencies omega_c and omega_a and the ratios a = omega_a/ omega_c at omega_c = 141 Ghz for e^- and e^+ and later, for e^- only, also at 164 Ghz. Responding to comments by Kostelecky's group we have reevaluated those past electron-positron data in order to obtain from them a figure of merit for violation of CPT symmetry analogous to the widely recognized r_K=|m_Kaon - m_Antikaon|/m_Kaon = 2*10^-18 value for kaon and anti-kaon. That expression may be seen as comparing experimental relativistic masses of particle states before and after the CPT operation has transformed particle into antiparticle. Such a figure of merit, found by us from our r_a = |a^- - a^+|< 2*10^-12 data, independent of any special theories, was even smaller, r_a*(h_bar*omega_c/m_0*c^2) = |m(e^-,Spin up)-m(e^+,Spin down)|/m(0e)< 12*10^-22.

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