Measurement of the branching fraction for the decay K-S -> pi mu nu with the KLOE detector
| العنوان: | Measurement of the branching fraction for the decay K-S -> pi mu nu with the KLOE detector |
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| المؤلفون: | Babusci, D., Berlowski, M., Bloise, C., Bossi, F., Branchini, R., Budano, A., Cao, Bo, Ceradini, F., Ciambrone, R., Curciarello, F., Czerwinski, E., D'Agostini, G., Dane, E., De Leo, V, De Lucia, E., De Santis, A., De Simone, R., Di Cicco, A., Di Domenico, A., Domenici, D., D'Uffizi, A., Fantini, A., Fermani, R., Fiore, S., Gajos, A., Gauzzi, R., Giovannella, S., Graziani, E., Ivanov, V. L., Johansson, Tord, Kang, X., Kisielewska-Kaminska, D., Kozyrev, E. A., Krzemien, W., Kupsc, Andrzej, Lukin, P. A., Mandaglio, G., Martini, M., Messi, R., Miscetti, S., Moricciani, D., Moskal, R., Parzych, S., Passeri, A., Patera, V, del Rio, E. Perez, Santangelo, R., Schioppa, M., Selce, A., Silarski, M., Sirghi, F., Solodov, E. P., Tortora, L., Venanzoni, G., Wislicki, W., Wolke, Magnus |
| المصدر: | Physics Letters B. 804 |
| مصطلحات موضوعية: | e(+)e(-) collisions, K-0 meson, Semileptonic decay |
| الوصف: | Based on a sample of 300 million K-S mesons produced in phi -> KLKS decays recorded by the KLOE experiment at the DA Phi NE e(+)e(-) collider we have measured the branching fraction for the decay K-S -> pi mu nu. The K-S mesons are identified by the interaction of K-L mesons in the detector. The K-S -> pi mu nu decays are selected by a boosted decision tree built with kinematic variables and by a time-of-flight measurement. Signal efficiencies are evaluated with data control samples of K-L -> pi mu nu decays. A fit to the reconstructed muon mass distribution finds 7223 +/- 180 signal events. Normalising to the K-S -> pi(+)pi(-) decay events the result for the branching fraction is B(K-S -> pi mu nu) = (4.56 +/- 0.11(stat) +/- 0.17(syst)) x 10(-4). It is the first measurement of this decay mode and the result allows an independent determination of vertical bar V-us vertical bar and a test of the lepton-flavour universality. (c) 2020 The Author. Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0Test/). |
| وصف الملف: | electronic |
| الوصول الحر: | https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-419036Test https://doi.org/10.1016/j.physletb.2020.135378Test https://uu.diva-portal.org/smash/get/diva2:1472105/FULLTEXT01.pdfTest |
| قاعدة البيانات: | SwePub |
| تدمد: | 03702693 18732445 |
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| DOI: | 10.1016/j.physletb.2020.135378 |