The first search for ultra-rare K+decays into the π+e+e−e+e−final state is reported, using a dataset collected by the NA62 experiment at CERN in 2017–2018. An upper limit of 1.4×10−8at 90% CL is obtained for the branching ratio of the K+→π+e+e−e+e−decay, predicted in the Standard Model to be (7.2 ±0.7) ×10−11. Upper limits at 90% CL are obtained at the level of 10−9for the branching ratios of two prompt decay chains involving pair-production of hidden-sector mediators: K+→π+aa, a →e+e−and K+→π+S, S→A A , A →e+e−
Search for K+ decays into the π+e+e−e+e− final state / Cortina Gil, E., Kleimenova, A., Minucci, E., Padolski, S., Petrov, P., Shaikhiev, A., Volpe, R., Numao, T., Petrov, Y., Velghe, B., Wong, V.W.S., Bryman, D., Fu, J., Hives, Z., Husek, T., Jerhot, J., Kampf, K., Zamkovsky, M., De Martino, B., Perrin-Terrin, M., et al.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - 846:(2023), pp. 1-9. [10.1016/j.physletb.2023.138193]
Search for K+ decays into the π+e+e−e+e− final state
Kozhuharov V.;D'Agostini G.;Raggi M.;Biagioni A.;Cretaro P.
2023
Abstract
The first search for ultra-rare K+decays into the π+e+e−e+e−final state is reported, using a dataset collected by the NA62 experiment at CERN in 2017–2018. An upper limit of 1.4×10−8at 90% CL is obtained for the branching ratio of the K+→π+e+e−e+e−decay, predicted in the Standard Model to be (7.2 ±0.7) ×10−11. Upper limits at 90% CL are obtained at the level of 10−9for the branching ratios of two prompt decay chains involving pair-production of hidden-sector mediators: K+→π+aa, a →e+e−and K+→π+S, S→A A , A →e+e−| File | Dimensione | Formato | |
|---|---|---|---|
|
Gil_Search for K +_2023.pdf
accesso aperto
Tipologia:
Versione editoriale (versione pubblicata con il layout dell'editore)
Licenza:
Creative commons
Dimensione
668.54 kB
Formato
Adobe PDF
|
668.54 kB | Adobe PDF |
I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
