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We present measurements related to the CKM angle β from BABAR based on 82 or ∼ 115 fb −1 data samples collected at the PEP-II e + e − asymmetric B Factory collider. A new method allowing to measure the sign of cos2β with B 0 → J/ψ "K * 0 " events is explained and related results reported. Recent CP measurements in the penguin dominated modes B 0 → φK 0 ,doi:10.2172/827314 fatcat:acxvbnhgmnas3hdhqkv5ento7i