CP Violation in B0s Mesons
Abstract
The B0s meson is a bound state of b and s type quarks. A CP violation parameter, βs, of that system is the analogue of the parameter β measured precisely at the B factories in B0 decays. The standard model predicts, robustly and precisely, a value of βs which is very close to zero. The CDF and D0 experiments now have about 2000 fully reconstructed and flavor-tagged B0s --> J/psi φ decays each, with which they set new experimental bounds on βs. A combination of results from CDF and D0 is consistent with the standard model at only the 2.2 sigma level. If the discrepancy is not a statistical fluctuation, it would indicate new sources of CP violation.
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