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May 29 Colloquium

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Vera Luth, SLAC National Accelerator Laboratory

Observation of Time Reversal Violation in B Meson Decays

Host: Dietrich Belitz

Abstract: While discrete symmetries and conservation laws are basic concepts of physics, the search for broken symmetries has been a very interesting topic for both experimentalists and theorists. In particle physics, the violation of charge conjugation and parity in weak interactions was observed 60 years ago, and CP violation was found to be violated in neutral kaon decays and more recently in B mesons. It has been much more difficult to detect the violation of time reversal at the microscopic level. The BABAR Collaboration has recently found first and very convincing evidence for T Violation in neutral B mesons. The result is consistent with equal CP and T violation and with CPT invariance.