Using the full data set of the NA48/2 experiment, the decay K-+/- -> pi(+/-)e(+)e(-)gamma is observed for the first time, selecting 120 candidates with 0 7.3 +/- 11.7 estimated background events. With K -> pi(+/-)pi(0)(D) as normalisation channel, the branching ratio is determined in a model-independent way to be Br(K-+/- -> pi(+/-)e(+)e(-)gamma, m(ee gamma) > 260 MeV/c(2)) = (1.19 +/- 0.12(stat) +/- 0.04(syst)) x 10(-8). This measured value and the spectrum of the e(+)e(-)gamma invariant mass allow a comparison with predictions of chiral perturbation theory. (c) 2007 Elsevier B.V. All rights reserved.

First observation and measurement of the decay K-+/-->pi(+/-)e(+)e(-)gamma

COSTANTINI, FLAVIO;GIUDICI, SERGIO;LAMANNA, GIANLUCA;SOZZI, MARCO STANISLAO;
2008

Abstract

Using the full data set of the NA48/2 experiment, the decay K-+/- -> pi(+/-)e(+)e(-)gamma is observed for the first time, selecting 120 candidates with 0 7.3 +/- 11.7 estimated background events. With K -> pi(+/-)pi(0)(D) as normalisation channel, the branching ratio is determined in a model-independent way to be Br(K-+/- -> pi(+/-)e(+)e(-)gamma, m(ee gamma) > 260 MeV/c(2)) = (1.19 +/- 0.12(stat) +/- 0.04(syst)) x 10(-8). This measured value and the spectrum of the e(+)e(-)gamma invariant mass allow a comparison with predictions of chiral perturbation theory. (c) 2007 Elsevier B.V. All rights reserved.
Batley, Jr; Culling, Aj; Kalmus, G; Lazzeroni, C; Munday, Dj; Slater, Mw; Wotton, Sa; Arcidiacono, R; Bocquet, G; Cabibbo, N; Ceccucci, A; Cundy, D; Falaleev, V; Fidecaro, M; Gatignon, L; Gonidec, A; Kubischta, W; Norton, A; Maier, A; Patel, M; Peters, A; Balev, S; Frabetti, Pl; Goudzovski, E; Hristov, P; Kekelidze, V; Kozhuharov, V; Litov, L; Madigozhin, D; Marinova, E; Molokanova, N; Polenkevich, I; Potrebenikov, Y; Stoynev, S; Zinchenko, A; Monnier, E; Swallow, E; Winston, R; Rubin, P; Walker, A; Baldini, W; Ramusino, Ac; Dalpiaz, P; Darniani, C; Fiorini, M; Gianoli, A; Martini, M; Petrucci, F; Savri, M; Scarpa, M; Wahl, H; Bizzeti, A; Calvetti, M; Celeghini, E; Lacopini, E; Lenti, M; Martelli, F; Ruggiero, G; Veltri, M; Behler, M; Eppard, K; Handel, C; Kleinknecht, K; Marouelli, P; Masetti, L; Moosbrugger, U; Morales, Cm; Renk, B; Wache, M; Wanke, R; Winhart, A; Coward, D; Dabrowski, A; Martin, Tf; Shieh, M; Szleper, M; Velasco, M; Wood, Md; Anzivino, G; Cenci, P; Imbergarno, E; Nappi, A; Pepe, M; Petrucci, Mc; Piccini, M; Raggi, A; Valdata Nappi, M; Cerri, C; Collazuol, G; Costantini, Flavio; Dilella, L; Doble, N; Fantechi, R; Fiorini, L; Giudici, Sergio; Lamanna, Gianluca; Mannelli, I; Michetti, A; Pierazzini, G; Sozzi, MARCO STANISLAO; Bloch Devaux, B; Cheshkov, C; Cheze, Jb; De Beer, M; Derre, J; Marel, G; Mazzucato, E; Peyaud, B; Vallage, B; Holder, M; Ziolkowski, M; Bifani, S; Biino, C; Cartiglia, N; Clernencic, A; Lopez, Sg; Marchetto, F; Dibon, H; Jeitler, A; Markytan, A; Mikulec, I; Neuhofer, G; Widhalm, L.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11568/193536
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