The NA62 experiment at CERN Super Proton Synchrotron was designed to measure BR(K+ → π+νv̄) with an in-fight technique, never used before for this measurement. This decay is characterised by a very precise prediction in the Standard Model. Its branching ratio, which is expected to be less than 10-10, is one of the best candidates to indicate indirect effects of new physics beyond SM at the highest mass scales. NA62 result on K+ → π+νv̄ from the full 2016 data set is described. Also a search for an invisible dark photon A′ has been performed, exploiting the efficient photon-veto capability and high resolution tracking of the NA62. The signal stems from the chain K+ → π+π0 followed by π0 → A′γ. No significant statistical excess has been identified. Upper limits on the dark photon coupling to the ordinary photon as a function of the dark photon mass have been set, improving on the previous limits over the mass range 60 - 110 MeV/c2.
Physics beyond the standard model with kaons at NA62 / Massarotti P., Aliberti R., Ambrosino F., Ammendola R., Angelucci B., Antonelli A., Anzivino G., Arcidiacono R., Barbanera M., Biagioni A., Bician L., Biino C., Bizzeti A., Blazek T., Bloch-Devaux B., Bonaiuto V., Boretto M., Bragadireanu M., Britton D., Brizioli F., et al.. - ELETTRONICO. - 2249:(2020), pp. 030003-030009. (15th International Conference on Meson-Nucleon Physics and the Structure of the Nucleon, MENU 2019 ) [10.1063/5.0009508].
Physics beyond the standard model with kaons at NA62
Bizzeti A.
;Bucci F.
;Iacopini E.
;Latino G.
;Lenti M.
;Ruggiero G.
;Volpe R.
;
2020
Abstract
The NA62 experiment at CERN Super Proton Synchrotron was designed to measure BR(K+ → π+νv̄) with an in-fight technique, never used before for this measurement. This decay is characterised by a very precise prediction in the Standard Model. Its branching ratio, which is expected to be less than 10-10, is one of the best candidates to indicate indirect effects of new physics beyond SM at the highest mass scales. NA62 result on K+ → π+νv̄ from the full 2016 data set is described. Also a search for an invisible dark photon A′ has been performed, exploiting the efficient photon-veto capability and high resolution tracking of the NA62. The signal stems from the chain K+ → π+π0 followed by π0 → A′γ. No significant statistical excess has been identified. Upper limits on the dark photon coupling to the ordinary photon as a function of the dark photon mass have been set, improving on the previous limits over the mass range 60 - 110 MeV/c2.| File | Dimensione | Formato | |
|---|---|---|---|
|
5.0009508.pdf
accesso aperto
Tipologia:
Pdf editoriale (Version of record)
Licenza:
Open Access
Dimensione
1.3 MB
Formato
Adobe PDF
|
1.3 MB | Adobe PDF |
I documenti in FLORE sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.



