/ Experiment-HEP arXiv:0711.4313

First Observation and Measurement of the Decay K+- ---> pi+- e+ e- gamma

Batley, J.R. (Cambridge U.) ; Culling, A.J. (Cambridge U.) ; Kalmus, George E. (Cambridge U.) ; Lazzeroni, Cristina (Cambridge U.) ; Munday, D.J. (Cambridge U.) ; Slater, M.W. (Cambridge U.) ; Wotton, S.A. (Cambridge U.) ; Arcidiacono, Roberta (CERN) ; Bocquet, G. (CERN) ; Cabibbo, N. (CERN) ; Ceccucci, Augusto (CERN) ; Cundy, D. (CERN) ; Falaleev, V. (CERN) ; Fidecaro, M. (CERN) ; Gatignon, L. (CERN) ; Gonidec, A. (CERN) ; Kubischta, W. (CERN) ; Norton, A. (CERN) ; Maier, A. (CERN) ; Patel, M. (CERN) ; Peters, A. (CERN) ; Balev, S. (Dubna, JINR) ; Frabetti, P.L. (Dubna, JINR) ; Goudzovski, E. (Dubna, JINR) ; Hristov, Peter (Dubna, JINR) ; Kekelidze, V. (Dubna, JINR) ; Kozhuharov, V. (Dubna, JINR) ; Litov, Leandar (Dubna, JINR) ; Madigozhin, D. (Dubna, JINR) ; Marinova, E. (Dubna, JINR) ; Molokanova, N. (Dubna, JINR) ; Polenkevich, I. (Dubna, JINR) ; Stoynev, S. (Dubna, JINR) ; Zinchenko, A. (Dubna, JINR) ; Monnier, E. (Chicago U.) ; Swallow, E. (Chicago U.) ; Winston, R. (Chicago U.) ; Rubin, Philip D. (Edinburgh U.) ; Walker, A. (Edinburgh U.) ; Baldini, W. (INFN, Ferrara) ; Cotta Ramusino, A. (INFN, Ferrara) ; Dalpiaz, P. (INFN, Ferrara) ; Damiani, C. (INFN, Ferrara) ; Fiorini, M. (INFN, Ferrara) ; Gianoli, Alberto (INFN, Ferrara) ; Martini, M. (INFN, Ferrara) ; Petrucci, F. (INFN, Ferrara) ; Savrie, M. (INFN, Ferrara) ; Scarpa, M. (INFN, Ferrara) ; Wahl, H. (INFN, Ferrara) ; Bizzeti, A. (INFN, Florence) ; Calvetti, M. (INFN, Florence) ; Celeghini, Enrico (INFN, Florence) ; Iacopini, E. (INFN, Florence) ; Lenti, M. (INFN, Florence) ; Martelli, F. (INFN, Florence) ; Ruggiero, G. (INFN, Florence) ; Veltri, M. (INFN, Florence) ; Behler, M. (Mainz U., Inst. Phys.) ; Eppard, K. (Mainz U., Inst. Phys.) ; Handel, C. (Mainz U., Inst. Phys.) ; Kleinknecht, Konrad (Mainz U., Inst. Phys.) ; Marouelli, P. (Mainz U., Inst. Phys.) ; Masetti, L. (Mainz U., Inst. Phys.) ; Moosbrugger, U. (Mainz U., Inst. Phys.) ; Morales Morales, C. (Mainz U., Inst. Phys.) ; Renk, B. (Mainz U., Inst. Phys.) ; Wache, M. (Mainz U., Inst. Phys.) ; Wanke, R. (Mainz U., Inst. Phys.) ; Winhart, A. (Mainz U., Inst. Phys.) ; Coward, D.H. (Northwestern U.) ; Dabrowski, A. (Northwestern U.) ; Fonseca Martin, T. (Northwestern U.) ; Shieh, M. (Northwestern U.) ; Szleper, M. (Northwestern U.) ; Velasco, M. (Northwestern U.) ; Wood, M.D. (Northwestern U.) ; Anzivino, Giuseppina (INFN, Perugia) ; Cenci, P. (INFN, Perugia) ; Imbergamo, E. (INFN, Perugia) ; Nappi, Nello (INFN, Perugia) ; Pepe, M. (INFN, Perugia) ; Petrucci, M.C. (INFN, Perugia) ; Piccini, M. (INFN, Perugia) ; Raggi, M. (INFN, Perugia) ; Valdata-Nappi, Marisa (INFN, Perugia) ; Cerri, C. (INFN, Pisa) ; Collazuol, G. (INFN, Pisa) ; Costantini, Flavio (INFN, Pisa) ; Di, L. (INFN, Pisa) ; Doble, Niels (INFN, Pisa) ; Fantechi, R. (INFN, Pisa) ; Fiorini, L. (INFN, Pisa) ; Giudici, S. (INFN, Pisa) ; Lamanna, G. (INFN, Pisa) ; Mannelli, Italo (INFN, Pisa) ; Michetti, A. (INFN, Pisa) ; Pierazzini, G. (INFN, Pisa) ; Sozzi, Marco S. (INFN, Pisa) ; Bloch-Devaux, Brigitte (DSM, DAPNIA, Saclay) ; Cheshkov, C. (DSM, DAPNIA, Saclay) ; Cheze, J.B. (DSM, DAPNIA, Saclay) ; De Beer, M. (DSM, DAPNIA, Saclay) ; Derre, J. (DSM, DAPNIA, Saclay) ; Marel, G. (DSM, DAPNIA, Saclay) ; Mazzucato, E. (DSM, DAPNIA, Saclay) ; Peyaud, B. (DSM, DAPNIA, Saclay) ; Vallage, B. (DSM, DAPNIA, Saclay) ; Holder, M. (Siegen U.) ; Ziolkowski, M. (Siegen U.) ; Bifani, S. (INFN, Turin) ; Biino, C. (INFN, Turin) ; Cartiglia, N. (INFN, Turin) ; Clemencic, M. (INFN, Turin) ; Goy Lopez, S. (INFN, Turin) ; Marchetto, Flavio Pietro (INFN, Turin) ; Dibon, Heinz (Vienna, OAW) ; Jeitler, Manfred (Vienna, OAW) ; Markytan, M. (Vienna, OAW) ; Mikulec, I. (Vienna, OAW) ; Neuhofer, G. (Vienna, OAW) ; Widhalm, L. (Vienna, OAW)

Published in: Phys.Lett.
Year: 2008
Vol.: B659
Page No: 493-499
Pages: 13

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 7.3 +- 1.7 estimated background events. With K+- -> pi+- pi0D as normalisation channel, the branching ratio is determined in a model-independent way to be Br(K+- -> pi+- e+ e- gamma, m_eegamma > 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.

Web-Page: http://pdglive.lbl.gov/REFERENCE_info1.brl?slacrpp=PHLTA,B659,493

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