NA48/2 results contributing to ChPT testing are presented. A sample of 1663 events of the rare decay K± → µ±νe+e− has been selected with a minimum e+e− effective mass of 140 MeV. The measured model independent decay rate is in agreement with ChPT predictions. The branching ratio of the K± → π±π0e+e− decay, never observed so far, has been obtained from a sample of about 5000 candidates with less than 6% background, also in agreement with ChPT predictions. In addition, a most precise measurement of the charged kaon semileptonic form factors has been obtained from 4.4 million Ke3 and 2.3 million Kµ3 events collected in 2004.
Recent NA48/2 results on rare kaon decays / Madigozhin, D., Anzivino, G., Arcidiacono, R., Baldini, W., Balev, S., Batley, J.R., Behler, M., Bifani, S., Biino, C., Bizzeti, A., Bloch-Devaux, B., Bocquet, G., Cabibbo, N., Calvetti, M., Cartiglia, N., Ceccucci, A., Celeghini, E., Cenci, P., Cerri, C., Cheshkov, C., et al.. - In: EPJ WEB OF CONFERENCES. - ISSN 2100-014X. - 206:(2018), pp. N/A-N/A. (48th International Symposium on Multiparticle Dynamics, ISMD 2018 sgp 2018) [10.1051/epjconf/201920605001].
Recent NA48/2 results on rare kaon decays
Bizzeti A.;
2018
Abstract
NA48/2 results contributing to ChPT testing are presented. A sample of 1663 events of the rare decay K± → µ±νe+e− has been selected with a minimum e+e− effective mass of 140 MeV. The measured model independent decay rate is in agreement with ChPT predictions. The branching ratio of the K± → π±π0e+e− decay, never observed so far, has been obtained from a sample of about 5000 candidates with less than 6% background, also in agreement with ChPT predictions. In addition, a most precise measurement of the charged kaon semileptonic form factors has been obtained from 4.4 million Ke3 and 2.3 million Kµ3 events collected in 2004.| File | Dimensione | Formato | |
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