On the $K^+ \to π^0π^0π^0 e^+ ν$ decay
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arXiv
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| Autori principali: | , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2024
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| _version_ | 1866912475175190528 |
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| author | Karkaryan, E. K. Kiselev, K. V. Obraztsov, V. F. Surkov, I. V. Vysotsky, M. I. |
| author_facet | Karkaryan, E. K. Kiselev, K. V. Obraztsov, V. F. Surkov, I. V. Vysotsky, M. I. |
| contents | The OKA Collaboration has obtained a new upper limit on the $K^+ \to π^0π^0π^0 e^+ ν$ decay probability which is 65 times lower than the one currently listed by PDG. However it is still about $10^{4}$ times worse than the theoretical prediction. It was suggested that production of pionium $A_{2π}$ in the final state of the semileptonic $K^+$ decay with subsequent $A_{2π} \to π^0 π^0$ decay will increase the value of theoretical branching ratio due to the absence of five-particle phase space suppression. The estimates done in our paper show that despite the gain in the phase space the decay $K^+ \to A_{2π}π^0 e^+ ν$ appeares to be strongly suppressed because of the smallness of the pionium wave function at zero $π$ mesons separation. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2412_15407 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | On the $K^+ \to π^0π^0π^0 e^+ ν$ decay Karkaryan, E. K. Kiselev, K. V. Obraztsov, V. F. Surkov, I. V. Vysotsky, M. I. High Energy Physics - Phenomenology High Energy Physics - Experiment The OKA Collaboration has obtained a new upper limit on the $K^+ \to π^0π^0π^0 e^+ ν$ decay probability which is 65 times lower than the one currently listed by PDG. However it is still about $10^{4}$ times worse than the theoretical prediction. It was suggested that production of pionium $A_{2π}$ in the final state of the semileptonic $K^+$ decay with subsequent $A_{2π} \to π^0 π^0$ decay will increase the value of theoretical branching ratio due to the absence of five-particle phase space suppression. The estimates done in our paper show that despite the gain in the phase space the decay $K^+ \to A_{2π}π^0 e^+ ν$ appeares to be strongly suppressed because of the smallness of the pionium wave function at zero $π$ mesons separation. |
| title | On the $K^+ \to π^0π^0π^0 e^+ ν$ decay |
| topic | High Energy Physics - Phenomenology High Energy Physics - Experiment |
| url | https://arxiv.org/abs/2412.15407 |