The NA48/2 experiment at CERN reports the first observation of the K± ? p±p0e+e- decay from an exposure of 1.7×1011 charged kaon decays recorded in 2003-2004. A sample of 4919 candidates with 4.9% background contamination allows the determination of the branching ratio in the full kinematic region. The study of the kinematic space shows evidence for a structure dependent contribution in agreement with predictions based on chiral perturbation theory. Several P- and CP-violating asymmetries are also evaluated. The most precise measurement of the charged kaon semi-leptonic form factors obtained by NA48/2 with 4.4 million Ke3 and 2.3 million Kµ3 events collected in 2004 will also be presented.
Latest results on rare kaon decays from the NA48/2 experiment at CERN / Raggi M.; Anzivino G.; Arcidiacono R.; Baldini W.; Balev S.; Batley; Behler M.; Bifani S.; Biino C.; Bizzeti A.; Bloch-Devaux B.; Bocquet G.; Cabibbo N.; Calvetti M.; Cartiglia N.; Ceccucci A.; Cenci P.; Cerri C.; Cheshkov C.; Cheze J.B.; Clemencic M.; Collazuol G.; Costantini F.; Ramusino A.C.; 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.; Martin T.F.; Frabetti P.L.; Gatignon L.; Gersabeck E.; Gianoli A.; Giudici S.; Gonidec A.; Goudzovski E.; Lopez S.G.; 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.; 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 C.M.; 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.; Renk B.; Rubin P.; Ruggiero G.; Savrie M.; Scarpa M.; Shieh M.; Shkarovskiy S.; Slater M.W.; Sozzi M.; Stoynev S.; Swallow E.; Szleper M.; Valdata-Nappi M.; Vallage B.; Velasco M.; Veltri M.; Venditti S.; Wache M.; Wahl H.; Walker A.; Wanke R.; Widhalm L.; Winhart A.; Winston R.; Wood M.D.; Wotton S.A.; Zinchenko A.; Ziolkowski M.. - In: POS PROCEEDINGS OF SCIENCE. - ISSN 1824-8039. - ELETTRONICO. - 390:(2021), pp. 1-6. (Intervento presentato al convegno 40th International Conference on High Energy Physics, ICHEP 2020 tenutosi a cze nel 2020).
Latest results on rare kaon decays from the NA48/2 experiment at CERN
Raggi M.;Bizzeti A.
;Calvetti M.
;Cerri C.;Collazuol G.;Costantini F.;Fantechi R.;Iacopini E.
;Lenti M.
;Mannelli I.;Peters A.;Ruggiero G.
;Scarpa M.;Sozzi M.;
2021
Abstract
The NA48/2 experiment at CERN reports the first observation of the K± ? p±p0e+e- decay from an exposure of 1.7×1011 charged kaon decays recorded in 2003-2004. A sample of 4919 candidates with 4.9% background contamination allows the determination of the branching ratio in the full kinematic region. The study of the kinematic space shows evidence for a structure dependent contribution in agreement with predictions based on chiral perturbation theory. Several P- and CP-violating asymmetries are also evaluated. The most precise measurement of the charged kaon semi-leptonic form factors obtained by NA48/2 with 4.4 million Ke3 and 2.3 million Kµ3 events collected in 2004 will also be presented.
I documenti in FLORE sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
