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

J.R. Batley A.J. Culling G. Kalmus C. Lazzeroni D.J. Munday M.W. Slater S.A. Wotton R. Arcidiacono G. Bocquet N. Cabibbo A. Ceccucci D. Cundy V. Falaleev M. Fidecaro L. Gatignon A. Gonidec W. Kubischta A. Norton A. Maier M. Patel A. Peters S. Balev P.L. Frabetti E. Goudzovski P. Hristov V. Kekelidze V. Kozhuharov L. Litov D. Madigozhin E. Marinova N. Molokanova I. Polenkevich Yu. Potrebenikov S. Stoynev A. Zinchenko E. Monnier 1 E. Swallow R. Winston P. Rubin A. Walker W. Baldini A. Cotta Ramusino P. Dalpiaz C. Damiani M. Fiorini A. Gianoli M. Martini F. Petrucci M. Savrié M. Scarpa H. Wahl A. Bizzeti M. Calvetti E. Celeghini E. Iacopini M. Lenti F. Martelli G. Ruggiero M. Veltri M. Behler K. Eppard C. Handel K. Kleinknecht P. Marouelli L. Masetti U. Moosbrugger C. Morales Morales B. Renk M. Wache R. Wanke A. Winhart D. Coward A. Dabrowski T. Fonseca Martin M. Shieh M. Szleper M. Velasco M.D. Wood G. Anzivino P. Cenci E. Imbergamo A. Nappi M. Pepe M.C. Petrucci M. Piccini M. Raggi M. Valdata-Nappi C. Cerri G. Collazuol F. Costantini L. Dilella N. Doble R. Fantechi L. Fiorini S. Giudici G. Lamanna I. Mannelli A. Michetti G. Pierazzini M. Sozzi B. Bloch-Devaux 2 C. Cheshkov 2 J.B. Chèze 2 M. de Beer 2 J. Derré 2 G. Marel 2 E. Mazzucato 2 B. Peyaud 2 B. Vallage 2 M. Holder M. Ziolkowski S. Bifani C. Biino N. Cartiglia M. Clemencic S. Goy Lopez F. Marchetto H. Dibon M. Jeitler M. Markytan I. Mikulec G. Neuhofer L. Widhalm
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.
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Submitted on : Thursday, August 21, 2008 - 2:19:41 PM
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J.R. Batley, A.J. Culling, G. Kalmus, C. Lazzeroni, D.J. Munday, et al.. First Observation and Measurement of the Decay K+- -> pi+- e+ e- gamma. Physics Letters B, Elsevier, 2008, 659, pp.493-499. ⟨10.1016/j.physletb.2007.11.075⟩. ⟨in2p3-00311804⟩

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