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. - ELETTRONICO. - 206:(2018), pp. 05001.0-05001.0. [10.1051/epjconf/201920605001]
Recent NA48/2 results on rare kaon decays
Bizzeti A.
;Calvetti M.
;Celeghini E.
;Cerri C.;Collazuol G.;Fantechi R.;Iacopini E.
;Lenti M.
;Mannelli I.;Marchevski R.
;Peters A.;Raggi M.;
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.
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