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.; Cheze, J. B.; Clemencic, M.; Collazuol, G.; Costantini, F.; Cotta Ramusino, A.; Coward, D.; Cundy, D.; Dabrowski, A.; Dalpiaz, P.; Damiani, C.; De Beer, M.; Derre, J.; Dibon, H.; Dilella, L.; Doble, N.; Eppard, K.; Falaleev, V.; Fantechi, R.; Fidecaro, M.; Fiorini, L.; Fiorini, M.; Fonseca Martin, T.; Frabetti, P. L.; Gatignon, L.; Gersabeck, E.; Gianoli, A.; Giudici, S.; Gonidec, A.; Goudzovski, E.; Goy Lopez, S.; Hitahochgesand, M.; Holder, M.; Hristov, P.; Iacopini, E.; Imbergamo, E.; Jeitler, M.; Kalmus, G.; Kekelidze, V.; Kleinknecht, K.; Kozhuharov, V.; Kubischta, W.; Lamanna, G.; Lazzeroni, C.; Lenti, M.; Litov, L.; Madigozhin, D.; Maier, A.; Mannelli, I.; Marchetto, F.; Marchevski, R.; Marel, G.; Markytan, M.; Marouelli, P.; Martini, M.; Masetti, L.; Mazzucato, E.; Michetti, A.; Mikulec, I.; Misheva, M.; Molokanova, N.; Monnier, E.; Moosbrugger, U.; Morales Morales, C.; Munday, D. J.; Nappi, A.; Neuhofer, G.; Norton, A.; Patel, M.; Pepe, M.; Peters, A.; Petrucci, F.; Petrucci, M. C.; Peyaud, B.; Piccini, M.; Pierazzini, G.; Polenkevich, I.; Potrebenikov, Yu.; Raggi, M.; Renk, B.. - In: EPJ WEB OF CONFERENCES. - ISSN 2100-014X. - 206:(2018), pp. N/A-N/A. (Intervento presentato al convegno 48th International Symposium on Multiparticle Dynamics, ISMD 2018 tenutosi a sgp nel 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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