New CP-violation and preferred-frame tests with polarized electrons

Details New CP-violation and preferred-frame tests with polarized electrons New CP-violation and preferred-frame tests with polarized electrons

2006-06-21

arxiv.org/abs/hep-ph/0606218v1

Phys.Rev.Lett.97:021603,2006

Physics

High Energy Physics

High Energy Physics - Phenomenology

4 figures, accepted for publication in Physical Review Letters

Scientific paper

10.1103/PhysRevLett.97.021603

We used a torsion pendulum containing $\sim 9 \times 10^{22}$ polarized electrons to search for CP-violating interactions between the pendulum's electrons and unpolarized matter in the laboratory's surroundings or the sun, and to test for preferred-frame effects that would precess the electrons about a direction fixed in inertial space. We find $|g_{\rm P}^e g_{\rm S}^N|/(\hbar c)< 1.7 \times 10^{-36}$ and $|g_{\rm A}^e g_{\rm V}^N|/(\hbar c) < 4.8 \times 10^{-56}$ for $\lambda > 1$AU. Our preferred-frame constraints, interpreted in the Kosteleck\'y framework, set an upper limit on the parameter $|\bm{\tilde {b}}^e| \leq 5.0 \times 10^{-21}$ eV that should be compared to the benchmark value $m_e^2/M_{\rm Planck}= 2 \times 10^{-17}$ eV.

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