Details

Autor(en) / Beteiligte

• Lai, A.
• Marras, D.
• Bevan, A.
• Dosanjh, R.S.
• Kalmus, G.E.
• Munday, D.J.
• Olaiya, E.
• Parker, M.A.
• White, T.O.
• Ceccucci, A.
• Cuhadar-Dönszelmann, T.
• Cundy, D.
• D'Agostini, G.
• Doble, N.
• Gatignon, L.
• Gonidec, A.
• Gorini, B.
• Govi, G.
• Grafström, P.
• Kubischta, W.
• Lacourt, A.
• Norton, A.
• Palestini, S.
• Panzer-Steindel, B.
• Wahl, H.
• Cheshkov, C.
• Gaponenko, A.
• Hristov, P.
• Kekelidze, V.
• Madigozhin, D.
• Molokanova, N.
• Tatishvili, G.
• Tkatchev, A.
• Martin, V.
• Walker, A.
• Contalbrigo, M.
• Gianoli, A.
• Savrié, M.
• Bizzeti, A.
• Calvetti, M.
• Graziani, G.
• Iacopini, E.
• Lenti, M.
• Martelli, F.
• Veltri, M.
• Becker, H.G.
• Eppard, K.
• Fox, H.
• Kalter, A.
• Kleinknecht, K.
• Lopes da Silva, P.
• Pellmann, I.
• Renk, B.
• Schmidt, S.A.
• Schönharting, V.
• Schué, Y.
• Wanke, R.
• Winhart, A.
• Wittgen, M.
• Fayard, L.
• Iconomidou-Fayard, L.
• Ocariz, J.
• Unal, G.
• Wingerter-Seez, I.
• Anzivino, G.
• Cenci, P.
• Imbergamo, E.
• Lubrano, P.
• Nappi, A.
• Piccini, M.
• Bertanza, L.
• Carosi, R.
• Cerri, C.
• Cirilli, M.
• Costantini, F.
• Fantechi, R.
• Giudici, S.
• Mannelli, I.
• De Beer, M.
• Debu, P.
• Mazzucato, E.
• Peyaud, B.
• Turlay, R.
• Maier, A.
• Ziolkowski, M.
• Arcidiacono, R.
• Cartiglia, N.
• Marchetto, F.
• Pastrone, N.
• Nassalski, J.
• Rondio, E.
• Wislicki, W.
• Wronka, S.
• Dibon, H.
• Fischer, G.
• Jeitler, M.
• Markytan, M.
• Mikulec, I.
• Pernicka, M.
• Widhalm, L.

Titel

Measurement of the ratio Γ(KL→π+π−)/Γ(KL→π±e∓ν) and extraction of the CP violation parameter |η

Ist Teil von

• Physics letters. B, 2007-02, Vol.645 (1), p.26-35

Ort / Verlag

Amsterdam: Elsevier B.V

Erscheinungsjahr

2007

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• We present a measurement of the ratio of the decay rates Γ(KL→π+π−)/Γ(KL→π±e∓ν), denoted as ΓK2π/ΓKe3. The analysis is based on data taken during a dedicated run in 1999 by the NA48 experiment at the CERN SPS. Using a sample of 47 000 K2π and five million Ke3 decays, we find ΓK2π/ΓKe3=(4.835±0.022stat.±0.016syst.)×10−3. From this we derive the branching ratio of the CP violating decay KL→π+π− and the CP violation parameter |η+−|. Excluding the CP conserving direct photon emission component KL→π+π−γ, we obtain the results BR(KL→π+π−)=(1.941±0.019)×10−3 and |η+−|=(2.223±0.012)×10−3.