CP Violation in the B0 meson system with BaBar
James Weatherall
TL;DR
This paper reports the first observation of CP violation in the B0 meson system using data from the BaBar detector, measuring sin2beta and exploring other decay modes.
Contribution
It provides the first measurement of CP violation in B0 mesons at BaBar, with significant statistical evidence, and presents preliminary results on related decay channels.
Findings
Measured sin2beta = 0.59 ± 0.14 (stat) ± 0.05 (syst)
Observed CP violation at 4 sigma level in B0 system
Preliminary results on B0 to pi+pi- and K+pi- decays
Abstract
The BABAR detector, at the PEP-II asymmetric B Factory at SLAC collected a sample of 32 million BBbar pairs whilst operating at energies near the Upsilon(4S) resonance between October 1999 and May 2001. An study of time-dependent CP-violating asymmetries in events where one neutral B meson is fully reconstructed in a final state containing charmonium produced the measurement sin2beta = 0.59 +- 0.14 (stat) +- 0.05 (syst), which constitutes an observation of CP violation in the B0 meson system at the 4 sigma level. Also presented are preliminary results from a study of CP violation in the decays B0 to pi+pi- and B0 to K+pi-.
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