Measurement of the CP-Violation Parameter (2β) in B⁰d/B⁰d → J/ψK⁰ₛ Decays

الأصل · EN

We present a measurement of the time-dependent asymmetry in the rate for B⁰d versus B⁰d decays to J/ψK⁰ₛ. In the context of the Standard Model this is interpreted as a measurement of the CP-violation parameter (2β). A total of 198± 17 B⁰d/B⁰d decays were observed in pp collisions at √s = 1.8 TeV by the CDF detector at the Fermilab Tevatron. The initial b-flavor is determined by a same side flavor tagging technique. Our analysis results in (2β) = 1.8± 1.1(stat)± 0.3(syst).