arXiv:2511.14384·v1·High Energy Physics — Phenomenology

Correction to $C P$ -asymmetry in $Υ (4 S)$ decays due to the admixture of $B^{0} B ˉ^{0}$ in a $C$ -even state

Abstract

$B B$ pairs from $Υ (4 S) \to B B$ decays are in $C$ -odd state. However, there is a small admixture of the $C$ -even state and it modifies the time dependent $C P$ -asymmetry. The $C$ -even component appears due to soft photon emission, breaking the pure $C$ -odd nature of the initial state. Using the two-particle wave function formalism, we derive analytical expressions for $C P$ -asymmetry in both pure and mixed $C$ -parity states. We emphasize the strong energy dependence of the admixture magnitude.

Comments: 8 pages, 2 figures

Correction to CP-asymmetry in Υ(4S) decays due to the admixture of B0Bˉ0 in a C-even state

Abstract

Correction to $C P$ -asymmetry in $Υ (4 S)$ decays due to the admixture of $B^{0} B ˉ^{0}$ in a $C$ -even state