NewCP-Violation and Preferred-Frame Tests with Polarized Electrons

2006/06/21 by B. R. Heckel, Claire Cramer, C. E. Cramer +6 · 13 citations
Physics and Astronomy · #Dark Matter and Cosmic Phenomena #Neutrino Physics Research #Noncommutative and Quantum Gravity Theories #hep-ph

paper · pdf · doi:10.1103/physrevlett.97.021603

published as Phys.Rev.Lett.97:021603,2006 · 4 figures, accepted for publication in Physical Review Letters

arxiv created 2006/06/21 · openalex publication_date 2006/07/12 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28

Abstract

We used a torsion pendulum containing \ensuremath∼9\ifmmode×\else\texttimes\fi10²² 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_P^eg_S^N|/(\ensuremathℏc)<1.7\ifmmode×\else\texttimes\fi10^\ensuremath-36 and |g_A^eg_V^N|/(\ensuremathℏc)<4.8\ifmmode×\else\texttimes\fi10^\ensuremath-56 for \ensuremathλ>1 AU. Our preferred-frame constraints, interpreted in the Kosteleck'y framework, set an upper limit on the parameter |\stackrel\texttildelow\mathbitb^e|\ensuremath≤5.0\ifmmode×\else\texttimes\fi10^\ensuremath-21 eV that should be compared to the benchmark value m_e²/M_Planck=2\ifmmode×\else\texttimes\fi10^\ensuremath-17 eV.

Citations

• Test of Cosmic Spatial Isotropy for Polarized Electrons Using a Rotatable Torsion Balance

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