Recent results on Kaon decays from NA48/2
- Bizzeti A.
- Anzivino G.
- Arcidiacono R.
- Baldini W.
- Balev S.
- Batley J. R.
- Behler M.
- Bi-Fani 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.
- 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.
- Hita-Hochgesand 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.
- Rubin P.
- Ruggiero G.
- Savrie M.
- Scarpa M.
- Shieh M.
- 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.
DOIAbstract
The first observation of the K± → π±π0e+e− rare decay by the NA48/2 experiment at CERN SPS is reported, based on ∼ 2 ×1011 K± decays recorded in 2003-2004. From a sample of 4919 candidates with 4.9% background the branching ratio in the full kinematic region is measured to be BR(K± → π±π0e+e−) = (4.24 ±0.14) ×10−6. The study of the kinematic space shows evidence for a structure dependent contribution in agreement with predictions based on Chiral Perturbation Theory. The CP-violating asymmetry between K+ → π+π0e+e− and K− → π−π0e+e− decay rates has been measured, providing an upper limit |ACP| < 4.82 ×10−2 at 90% CL. The NA48/2 combined measurement of the charged kaon semileptonic form factors, based on 4.4 million K± → π0e±νe and 2.3 mil...
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