تقرير
Measurement of the $K_S \to \pi e \nu$ branching fraction with the KLOE experiment
| العنوان: | Measurement of the $K_S \to \pi e \nu$ branching fraction with the KLOE experiment |
|---|---|
| المؤلفون: | Babusci, D., Berlowski, M., Bloise, C., Bossi, F., Branchini, P., Cao, B., Ceradini, F., Ciambrone, P., Curciarello, F., Czerwiński, E., D'Agostini, G., D'Amico, R., Danè, E., De Leo, V., De Lucia, E., De Santis, A., De Simone, P., Di Cicco, A., Di Domenico, A., Diociaiuti, E., Domenici, D., D'Uffizi, A., Fantini, G., Gajos, A., Gamrat, S., Gauzzi, P., Giovannella, S., Graziani, E., Kang, X., Kupsc, A., Mandaglio, G., Martini, M., Miscetti, S., Moskal, P., Passeri, A., del Rio, E. Perez, Schioppa, M., Selce, A., Silarski, M., Sirghi, F., Solodov, E. P., Wiślicki, W., Wolke, M. |
| سنة النشر: | 2022 |
| المجموعة: | High Energy Physics - Experiment |
| مصطلحات موضوعية: | High Energy Physics - Experiment |
| الوصف: | The branching fraction for the decay $K_S \to \pi e \nu$ has been measured with a sample of 300 million $K_S$ mesons produced in $\phi \to K_L K_S$ decays recorded by the KLOE experiment at the DA$\Phi$NE $e^+e^-$ collider. Signal decays are selected by a boosted decision tree built with kinematic variables and time-of-flight measurements. Data control samples of $K_L \to \pi e \nu$ decays are used to evaluate signal selection efficiencies. A fit to the reconstructed electron mass distribution finds 49647$\pm$316 signal events. Normalising to the $K_S \to \pi^+\pi^-$ decay events the result for the branching fraction is $\mathcal{B}(K_S \to \pi e \nu) = (7.211 \pm 0.046_{\rm stat} \pm 0.052_{\rm syst}) \times10^{-4}$. The combination with our previous measurement gives $\mathcal{B}(K_S \to \pi e \nu) = (7.153 \pm 0.037_{\rm stat} \pm 0.043_{\rm syst}) \times10^{-4}$. From this value we derive $f_+(0)|V_{us}| = 0.2170 \pm 0.009$. Comment: arXiv admin note: substantial text overlap with arXiv:1912.05990 |
| نوع الوثيقة: | Working Paper |
| URL الوصول: | http://arxiv.org/abs/2208.04872 |
| رقم الأكسشن: | edsarx.2208.04872 |
| قاعدة البيانات: | arXiv |
| الوصف غير متاح. |