The K(S) -> pi(+)pi(-)e(+)e(-) decay mode was investigated using the data collected in 2002 by the NA48/1 Collaboration. With about 23 k K(S) -> pi(+)pi(-)e(+)e(-) events and 59 k K(L) -> pi(+)pi(-)pi(0)(D) normalization decays, the K(S) -> pi(+)pi(-)e(+)e(-) branching ratio relative to the K(L) -> pi(+)pi(-)pi(0)(D) one was determined to be BR(K(S) -> pi(+)pi(-)e(+)e(-))/BR(K(L) -> pi(+)pi(-)pi(0)(D)) = (3.28 +/- 0.06(stat) +/- 0.04(syst)) x 10(-2). This result was used to set the upper limit vertical bar g(E1)/g(BR)vertical bar < 3.0 at 90% CL on the presence, in the decay amplitude, of an E1 direct emission (g(E1)) term relative to the dominant inner bremsstrahlung (g(BR)) term. The CP-violating asymmetry A(phi) in the sin phi cos phi distribution of K(S) -> pi(+)pi(-)e(+)e(-) events, where phi is the angle between the pi(+)pi(-) and the e(+)e(-) decay planes in the kaon centre of mass, was found to be A(phi) = (-0.4 +/- 0.8)%, consistent with zero. These results are in good agreement with a description of the K(S) -> pi(+)pi(-)e(+)e(-) decay amplitude dominated by the CF-even inner bremsstrahlung process. (C) 2010 Elsevier B.V. All rights reserved.

Precision measurement of the ratio BR(K(S) -> pi(+)pi(-)e(+)e(-))/BR(K(L) -> pi(+)pi(-)pi(0)(D))

LAMANNA, GIANLUCA;GIUDICI, SERGIO;SOZZI, MARCO STANISLAO;
2011

Abstract

The K(S) -> pi(+)pi(-)e(+)e(-) decay mode was investigated using the data collected in 2002 by the NA48/1 Collaboration. With about 23 k K(S) -> pi(+)pi(-)e(+)e(-) events and 59 k K(L) -> pi(+)pi(-)pi(0)(D) normalization decays, the K(S) -> pi(+)pi(-)e(+)e(-) branching ratio relative to the K(L) -> pi(+)pi(-)pi(0)(D) one was determined to be BR(K(S) -> pi(+)pi(-)e(+)e(-))/BR(K(L) -> pi(+)pi(-)pi(0)(D)) = (3.28 +/- 0.06(stat) +/- 0.04(syst)) x 10(-2). This result was used to set the upper limit vertical bar g(E1)/g(BR)vertical bar < 3.0 at 90% CL on the presence, in the decay amplitude, of an E1 direct emission (g(E1)) term relative to the dominant inner bremsstrahlung (g(BR)) term. The CP-violating asymmetry A(phi) in the sin phi cos phi distribution of K(S) -> pi(+)pi(-)e(+)e(-) events, where phi is the angle between the pi(+)pi(-) and the e(+)e(-) decay planes in the kaon centre of mass, was found to be A(phi) = (-0.4 +/- 0.8)%, consistent with zero. These results are in good agreement with a description of the K(S) -> pi(+)pi(-)e(+)e(-) decay amplitude dominated by the CF-even inner bremsstrahlung process. (C) 2010 Elsevier B.V. All rights reserved.
Batley, Jr; Kalmus, Ge; Lazzeroni, C; Munday, Dj; Patel, M; Slater, Mw; Wotton, Sa; Arcidiacono, R; Bocquet, G; Ceccucci, A; Cundy, D; Doble, N; Falaleev, V; Gatignon, L; Gonidec, A; Grafstrom, R; Kubischta, W; Marchetto, F; Mikulec, I; Norton, A; Panzer Steindel, B; Rubin, P; Wahl, H; Goudzovski, E; Hristov, P; Kekelidze, V; Kozhuharov, V; Litov, L; Madigozhin, D; Molokanova, N; Potrebenikov, Y; Stoynev, S; Zinchenko, A; Monnier, E; Swallow, Ec; Winston, R; Sacco, R; Walker, A; Baldini, W; Dalpiaz, P; Frabetti, Pl; Gianoli, A; Martini, M; Petrucci, F; Savrie, M; Scarpa, M; Calvetti, M; Collazuol, G; Iacopini, E; Ruggiero, G; Bizzeti, A; Lenti, M; Veltri, M; Behler, M; Eppard, K; Eppard, M; Hirstius, A; Kleinknecht, K; Koch, U; Marouelli, P; Masetti, L; Moosbrugger, U; Morales, Cm; Peters, A; Wanke, R; Winhart, A; Dabrowski, A; Martin, Tf; Szleper, M; Velasco, M; Anzivino, G; Imbergamo, E; Lamanna, Gianluca; Lubrano, P; Michetti, A; Nappi, A; Piccini, M; Valdata Nappi, M; Cenci, P; Pepe, M; Petrucci, Mc; Cerri, C; Fantechi, R; Mannelli, I; Costantini, Flavio; Fiorini, L; Giudici, Sergio; Pierazzini, G; Sozzi, MARCO STANISLAO; Cheshkov, C; Cheze, Jb; De Beer, M; Debu, P; Gouge, G; Marel, G; Mazzucato, E; Peyaud, B; Vallage, B; Holder, M; Maier, A; Ziolkowski, M; Biino, C; Cartiglia, N; Clemencic, M; Lopez, Sg; Menichetti, E; Pastrone, N; Wislicki, W; Dibon, H; Jeitler, M; Markytan, M; Neuhofer, G; Widhalm, L.
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