Speaker
Description
The time evolution of the neutral B mesons determines key parameters in flavor physics. While their behavior is generally studied under the assumption of perfect quantum coherence, interactions with the surrounding environment can introduce decoherence. The influence of such environmental effects on neutral meson systems can be effectively described using the open quantum system framework. This decoherence can obscure the extraction of critical parameters, such as the oscillation frequency $\Delta m$ and the $ CP $-violating parameter $ \sin 2\beta $. Utilizing the available experimental data, we present the first combined analysis of mixing asymmetry and $ CP $-asymmetry measurements for $ B_d $-mesons, revealing that $ \lambda_d $ is non-zero with a significance of approximately $ 6 \,\sigma $. Furthermore, we establish the first experimental constraints on the decoherence parameter $ \lambda_s $ for $ B_s $-mesons, confirming its non-zero value at $ 3 \,\sigma $.
