会议论文详细信息
10th International Conference on Kaon Physics | |
Dispersive analysis of KS → γγ and KS → γl+l? | |
Tunstall, Lewis C.^1 ; Colangelo, Gilberto^1 ; Stucki, Ramon^1 | |
Albert Einstein Centre for Fundamental Physics, Institute for Theoretical Physics, University of Bern, Sidlerstrasse 5, Bern | |
CH-3012, Switzerland^1 | |
关键词: Chiral perturbation theory; Decay rate; Dispersion relations; Dispersive analysis; Final state; Gammagamma; | |
Others : https://iopscience.iop.org/article/10.1088/1742-6596/800/1/012034/pdf DOI : 10.1088/1742-6596/800/1/012034 |
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来源: IOP | |
【 摘 要 】
We calculate the decay rates for KS→ γγ and KS→ γl+l-(l = e or μ)within a dispersive framework in which the weak Hamiltonian carries momentum. Given input from KS→ ππ and γγ(∗)→ππ, we solve the once-subtracted dispersion relations numerically and find that final-state ππ interactions generate sizeable corrections to the predictions from 3-flavour chiral perturbation theory. Our analysis predicts BR(KS→ γγ) = (2.34 ± 0.31) × 10-6, BR(KS→ γe+e-) = (4.38 ± 0.57) × 10-8, and BR(KS→ γμ+μ-) = (1.45 ± 0.27) × 10-9.
【 预 览 】
Files | Size | Format | View |
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Dispersive analysis of KS → γγ and KS → γl+l? | 709KB | download |