Correction to CP-Asymmetry in $$\Upsilon {\text{(}}4S{\text{)}}$$ Decays Due to the Admixture of $${{B}^{0}}{{\bar {B}}^{0}}$$ in a C-Even State
Abstract
$$BB$$ pairs from $$\Upsilon (4S) \to BB$$ 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 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 $$CP$$ -asymmetry in both pure and mixed C -parity states. We emphasize the strong energy dependence of the admixture magnitude.
Fields of Study & Subjects
Particle physics theoretical and experimental studies
Quantum Chromodynamics and Particle Interactions
High-Energy Particle Collisions Research
Publication details
- Journal / source
- Journal of Experimental and Theoretical Physics Letters
- Volume
- 123
- Issue
- 2
- Pages
- 67–72
- Publication date
- 1 January 2026
- Language
- EN