 2022

Source: www.whatdotheyknow.com/request/oxford_physics_past_papers_2/response/2340696/attach/10/Physics%20Papers%202021.pdf?cookie_passthrough=1

Source bundle pages 134–138. The paper cover establishes 2022; the attachment filename uses 2021. All times in the kaon calculations are proper times, unless a laboratory conversion is explicitly made. The CP symmetry approximation is used where the paper identifies the physical short- and long-lived states with kaon CP eigenstates.