Role and contribution of the resonance effect for the decay process of
The magnitude of the direct CP asymmetry generated during the weak decay of hadrons is attributed to the weak phase and certain strong phases. The weak phase originates from the CKM matrix, while a strong phase may result from the resonance effect produced by the mixing of vector mesons to meson pai...
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| Published in: | Chinese physics C Vol. 49; no. 11; p. 113103 |
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| Main Authors: | , , , |
| Format: | Journal Article |
| Language: | English |
| Published: |
01.11.2025
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| ISSN: | 1674-1137, 2058-6132 |
| Online Access: | Get full text |
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| Summary: | The magnitude of the direct CP asymmetry generated during the weak decay of hadrons is attributed to the weak phase and certain strong phases. The weak phase originates from the CKM matrix, while a strong phase may result from the resonance effect produced by the mixing of vector mesons to meson pairs. can decay directly into meson pairs; both and can also decay into meson pairs, with a small contribution from isospin symmetry breaking. The main contribution for the middle state vector meson interference is the mix of , , and . We calculated the CP asymmetry and decay branching ratio for within the framework of QCD factorization and compared them with previous studies. We also analyzed the decay process. The results show that the CP asymmetry of these four decay processes is significantly enhanced, especially for the decay process. Moreover, the decay branching ratio also changes under the resonance effect. These results might provide support for the experimental analysis of the meson. |
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| ISSN: | 1674-1137 2058-6132 |
| DOI: | 10.1088/1674-1137/ade6d8 |