Correction to $CP$-asymmetry in ${\rm Y}(4S)$ decays due to the admixture of $B^0{\bar{B}}^0$ in a $C$-even state

N. A. Panchenko, S. I. Godunov

$BB$ pairs from ${\rm Y}(4S)\to BB$ decays are in $C$-odd state. However, there is a small admixture of the $C$-even state and it modifies the time dependent $CP$-asymmetry. The $C$-even…