Measurement of the decay rate and form factor parameter αK* in the decay KL → e+e-γ

V. Fanti; A. Lai; L. Musa; D. Marras; A. Nappi; B. Hay; R. W. Moore; K. N. Moore; D. J. Munday; M. D. Needham; M. A. Parker; T. O. White; S. A. Wotton; G. Barr; G. Bocquet; J. Bremer; A. Ceccucci; D. Cundy; N. Doble; W. Funk; L. Gatignon; A. Gianoli; A. Gonidec; G. Govi; P. Grafström; W. Kubischta; A. Lacourt; S. Luitz; G. Kesseler; J. P. Matheys; A. Norton; S. Palestini; B. Panzer-Steindel; D. Schinzel; H. Taureg; M. Velasco; O. Vossnack; H. Wahl; G. Wirrer; V. Kekelidze; A. Mestvirishvili; G. Tatishvili; I. Potrebenikov; A. Tkatchev; A. Zinchenko; O. Boyle; V. J. Martin; I. G. Knowles; H. L C Parsons; P. Dalpiaz; J. Duclos; P. L. Frabetti; M. Martini; F. Petrucci; M. Porcu; M. Savrié; A. Bizzeti; M. Calvetti; G. Collazuol; G. Graziani; E. Iacopini; M. Lenti; A. Michetti; H. G. Becker; H. Blümer; P. Buchholz; D. Coward; C. Ebersberger; H. Fox; A. Kalter; K. Kleinknecht; U. Koch; L. Köpke; B. Renk; J. Scheidt; J. Schmidt; V. Schönharting; Y. Schué; R. Wilhelm; A. Winhart; M. Wittgen; J. C. Chollet; S. Crépé; L. Iconomidou-Fayard; L. Fayard; J. Ocariz; G. Unal; D. Vattolo; I. Wingerter; G. Anzivino; P. Cenci; P. Lubrano; M. Pepe; B. Gorini; P. Calafiura; R. Carosi; C. Cerri; M. Cirilli; F. Costantini; R. Fantechi; S. Giudici; I. Mannelli; G. Pierazzini; M. Sozzi; J. B. Cheze; J. Cogan; M. de Beer; P. Debu; A. Formica; R. Granier de Cassagnac; P. Hristov; E. Mazzucato; B. Peyaud; S. Schanne; R. Turlay; B. Vallage; I. Augustin; M. Bender; M. Holder; M. Ziolkowski; R. Arcidiacono; C. Biino; F. Marchetto; E. Menichetti; J. Nassalski; E. Rondio; M. Szleper; W. Wislicki; S. Wronka; H. Dibon; G. Fischer; M. Jeitler; M. Markytan; I. Mikulec; G. Neuhofer; M. Pernicka; A. Taurok

doi:10.1016/S0370-2693(99)00561-4

Measurement of the decay rate and form factor parameter α_K* in the decay K_L → e⁺e^-γ

V. Fanti^*, A. Lai, L. Musa, D. Marras, A. Nappi, B. Hay, R. W. Moore, K. N. Moore, D. J. Munday, M. D. Needham, M. A. Parker, T. O. White, S. A. Wotton, G. Barr, G. Bocquet, J. Bremer, A. Ceccucci, D. Cundy, N. Doble, W. FunkL. Gatignon, A. Gianoli, A. Gonidec, G. Govi, P. Grafström, W. Kubischta, A. Lacourt, S. Luitz, G. Kesseler, J. P. Matheys, A. Norton, S. Palestini, B. Panzer-Steindel, D. Schinzel, H. Taureg, M. Velasco, O. Vossnack, H. Wahl, G. Wirrer, V. Kekelidze, A. Mestvirishvili, G. Tatishvili, I. Potrebenikov, A. Tkatchev, A. Zinchenko, O. Boyle, V. J. Martin, I. G. Knowles, H. L C Parsons, P. Dalpiaz, J. Duclos, P. L. Frabetti, M. Martini, F. Petrucci, M. Porcu, M. Savrié, A. Bizzeti, M. Calvetti, G. Collazuol, G. Graziani, E. Iacopini, M. Lenti, A. Michetti, H. G. Becker, H. Blümer, P. Buchholz, D. Coward, C. Ebersberger, H. Fox, A. Kalter, K. Kleinknecht, U. Koch, L. Köpke, B. Renk, J. Scheidt, J. Schmidt, V. Schönharting, Y. Schué, R. Wilhelm, A. Winhart, M. Wittgen, J. C. Chollet, S. Crépé, L. Iconomidou-Fayard, L. Fayard, J. Ocariz, G. Unal, D. Vattolo, I. Wingerter, G. Anzivino, P. Cenci, P. Lubrano, M. Pepe, B. Gorini, P. Calafiura, R. Carosi, C. Cerri, M. Cirilli, F. Costantini, R. Fantechi, S. Giudici, I. Mannelli, G. Pierazzini, M. Sozzi, J. B. Cheze, J. Cogan, M. de Beer, P. Debu, A. Formica, R. Granier de Cassagnac, P. Hristov, E. Mazzucato, B. Peyaud, S. Schanne, R. Turlay, B. Vallage, I. Augustin, M. Bender, M. Holder, M. Ziolkowski, R. Arcidiacono, C. Biino, F. Marchetto, E. Menichetti, J. Nassalski, E. Rondio, M. Szleper, W. Wislicki, S. Wronka, H. Dibon, G. Fischer, M. Jeitler, M. Markytan, I. Mikulec, G. Neuhofer, M. Pernicka, A. Taurok

^*Corresponding author for this work

Physics and Astronomy

Research output: Contribution to journal › Article

18 Scopus citations

Abstract

The decay rate of the neutral K meson K_L → e⁺e^-γ has been measured with the NA48 detector at the CERN SPS. A total of 6864 events has been observed with an estimated background of 10 events. The branching ratio is Γ(K_L → e⁺e^-γ)/Γ(K_L → all) = (1.06 ± 0.02_stat ± 0.02_sys ± 0.04_calc) × 10^-5 The parameter α_K* describing the relative strength of the two contributing amplitudes to this decay through intermediate pseudoscalar or vector mesons was measured to be α_K* = -0.36 ± 0.06_stat ± 0.02_sys.

Original language	English (US)
Pages (from-to)	553-563
Number of pages	11
Journal	Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume	458
Issue number	4
DOIs	https://doi.org/10.1016/S0370-2693(99)00561-4
State	Published - 1999

ASJC Scopus subject areas

Nuclear and High Energy Physics

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Fanti, V., Lai, A., Musa, L., Marras, D., Nappi, A., Hay, B., Moore, R. W., Moore, K. N., Munday, D. J., Needham, M. D., Parker, M. A., White, T. O., Wotton, S. A., Barr, G., Bocquet, G., Bremer, J., Ceccucci, A., Cundy, D., Doble, N., ... Taurok, A. (1999). Measurement of the decay rate and form factor parameter α_K* in the decay K_L → e⁺e^-γ. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 458(4), 553-563. https://doi.org/10.1016/S0370-2693(99)00561-4

Fanti, V. ; Lai, A. ; Musa, L. ; Marras, D. ; Nappi, A. ; Hay, B. ; Moore, R. W. ; Moore, K. N. ; Munday, D. J. ; Needham, M. D. ; Parker, M. A. ; White, T. O. ; Wotton, S. A. ; Barr, G. ; Bocquet, G. ; Bremer, J. ; Ceccucci, A. ; Cundy, D. ; Doble, N. ; Funk, W. ; Gatignon, L. ; Gianoli, A. ; Gonidec, A. ; Govi, G. ; Grafström, P. ; Kubischta, W. ; Lacourt, A. ; Luitz, S. ; Kesseler, G. ; Matheys, J. P. ; Norton, A. ; Palestini, S. ; Panzer-Steindel, B. ; Schinzel, D. ; Taureg, H. ; Velasco, M. ; Vossnack, O. ; Wahl, H. ; Wirrer, G. ; Kekelidze, V. ; Mestvirishvili, A. ; Tatishvili, G. ; Potrebenikov, I. ; Tkatchev, A. ; Zinchenko, A. ; Boyle, O. ; Martin, V. J. ; Knowles, I. G. ; Parsons, H. L C ; Dalpiaz, P. ; Duclos, J. ; Frabetti, P. L. ; Martini, M. ; Petrucci, F. ; Porcu, M. ; Savrié, M. ; Bizzeti, A. ; Calvetti, M. ; Collazuol, G. ; Graziani, G. ; Iacopini, E. ; Lenti, M. ; Michetti, A. ; Becker, H. G. ; Blümer, H. ; Buchholz, P. ; Coward, D. ; Ebersberger, C. ; Fox, H. ; Kalter, A. ; Kleinknecht, K. ; Koch, U. ; Köpke, L. ; Renk, B. ; Scheidt, J. ; Schmidt, J. ; Schönharting, V. ; Schué, Y. ; Wilhelm, R. ; Winhart, A. ; Wittgen, M. ; Chollet, J. C. ; Crépé, S. ; Iconomidou-Fayard, L. ; Fayard, L. ; Ocariz, J. ; Unal, G. ; Vattolo, D. ; Wingerter, I. ; Anzivino, G. ; Cenci, P. ; Lubrano, P. ; Pepe, M. ; Gorini, B. ; Calafiura, P. ; Carosi, R. ; Cerri, C. ; Cirilli, M. ; Costantini, F. ; Fantechi, R. ; Giudici, S. ; Mannelli, I. ; Pierazzini, G. ; Sozzi, M. ; Cheze, J. B. ; Cogan, J. ; de Beer, M. ; Debu, P. ; Formica, A. ; Granier de Cassagnac, R. ; Hristov, P. ; Mazzucato, E. ; Peyaud, B. ; Schanne, S. ; Turlay, R. ; Vallage, B. ; Augustin, I. ; Bender, M. ; Holder, M. ; Ziolkowski, M. ; Arcidiacono, R. ; Biino, C. ; Marchetto, F. ; Menichetti, E. ; Nassalski, J. ; Rondio, E. ; Szleper, M. ; Wislicki, W. ; Wronka, S. ; Dibon, H. ; Fischer, G. ; Jeitler, M. ; Markytan, M. ; Mikulec, I. ; Neuhofer, G. ; Pernicka, M. ; Taurok, A. / Measurement of the decay rate and form factor parameter α_K* in the decay K_L → e⁺e^-γ. In: Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics. 1999 ; Vol. 458, No. 4. pp. 553-563.

@article{d577254543e34bc0bfadf93b93dc86d1,

title = "Measurement of the decay rate and form factor parameter αK* in the decay KL → e+e-γ",

abstract = "The decay rate of the neutral K meson KL → e+e-γ has been measured with the NA48 detector at the CERN SPS. A total of 6864 events has been observed with an estimated background of 10 events. The branching ratio is Γ(KL → e+e-γ)/Γ(KL → all) = (1.06 ± 0.02stat ± 0.02sys ± 0.04calc) × 10-5 The parameter αK* describing the relative strength of the two contributing amplitudes to this decay through intermediate pseudoscalar or vector mesons was measured to be αK* = -0.36 ± 0.06stat ± 0.02sys.",

author = "V. Fanti and A. Lai and L. Musa and D. Marras and A. Nappi and B. Hay and Moore, {R. W.} and Moore, {K. N.} and Munday, {D. J.} and Needham, {M. D.} and Parker, {M. A.} and White, {T. O.} and Wotton, {S. A.} and G. Barr and G. Bocquet and J. Bremer and A. Ceccucci and D. Cundy and N. Doble and W. Funk and L. Gatignon and A. Gianoli and A. Gonidec and G. Govi and P. Grafstr{\"o}m and W. Kubischta and A. Lacourt and S. Luitz and G. Kesseler and Matheys, {J. P.} and A. Norton and S. Palestini and B. Panzer-Steindel and D. Schinzel and H. Taureg and M. Velasco and O. Vossnack and H. Wahl and G. Wirrer and V. Kekelidze and A. Mestvirishvili and G. Tatishvili and I. Potrebenikov and A. Tkatchev and A. Zinchenko and O. Boyle and Martin, {V. J.} and Knowles, {I. G.} and Parsons, {H. L C} and P. Dalpiaz and J. Duclos and Frabetti, {P. L.} and M. Martini and F. Petrucci and M. Porcu and M. Savri{\'e} and A. Bizzeti and M. Calvetti and G. Collazuol and G. Graziani and E. Iacopini and M. Lenti and A. Michetti and Becker, {H. G.} and H. Bl{\"u}mer and P. Buchholz and D. Coward and C. Ebersberger and H. Fox and A. Kalter and K. Kleinknecht and U. Koch and L. K{\"o}pke and B. Renk and J. Scheidt and J. Schmidt and V. Sch{\"o}nharting and Y. Schu{\'e} and R. Wilhelm and A. Winhart and M. Wittgen and Chollet, {J. C.} and S. Cr{\'e}p{\'e} and L. Iconomidou-Fayard and L. Fayard and J. Ocariz and G. Unal and D. Vattolo and I. Wingerter and G. Anzivino and P. Cenci and P. Lubrano and M. Pepe and B. Gorini and P. Calafiura and R. Carosi and C. Cerri and M. Cirilli and F. Costantini and R. Fantechi and S. Giudici and I. Mannelli and G. Pierazzini and M. Sozzi and Cheze, {J. B.} and J. Cogan and {de Beer}, M. and P. Debu and A. Formica and {Granier de Cassagnac}, R. and P. Hristov and E. Mazzucato and B. Peyaud and S. Schanne and R. Turlay and B. Vallage and I. Augustin and M. Bender and M. Holder and M. Ziolkowski and R. Arcidiacono and C. Biino and F. Marchetto and E. Menichetti and J. Nassalski and E. Rondio and M. Szleper and W. Wislicki and S. Wronka and H. Dibon and G. Fischer and M. Jeitler and M. Markytan and I. Mikulec and G. Neuhofer and M. Pernicka and A. Taurok",

year = "1999",

doi = "10.1016/S0370-2693(99)00561-4",

language = "English (US)",

volume = "458",

pages = "553--563",

journal = "Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics",

issn = "0370-2693",

publisher = "Elsevier",

number = "4",

}

Fanti, V, Lai, A, Musa, L, Marras, D, Nappi, A, Hay, B, Moore, RW, Moore, KN, Munday, DJ, Needham, MD, Parker, MA, White, TO, Wotton, SA, Barr, G, Bocquet, G, Bremer, J, Ceccucci, A, Cundy, D, Doble, N, Funk, W, Gatignon, L, Gianoli, A, Gonidec, A, Govi, G, Grafström, P, Kubischta, W, Lacourt, A, Luitz, S, Kesseler, G, Matheys, JP, Norton, A, Palestini, S, Panzer-Steindel, B, Schinzel, D, Taureg, H, Velasco, M, Vossnack, O, Wahl, H, Wirrer, G, Kekelidze, V, Mestvirishvili, A, Tatishvili, G, Potrebenikov, I, Tkatchev, A, Zinchenko, A, Boyle, O, Martin, VJ, Knowles, IG, Parsons, HLC, Dalpiaz, P, Duclos, J, Frabetti, PL, Martini, M, Petrucci, F, Porcu, M, Savrié, M, Bizzeti, A, Calvetti, M, Collazuol, G, Graziani, G, Iacopini, E, Lenti, M, Michetti, A, Becker, HG, Blümer, H, Buchholz, P, Coward, D, Ebersberger, C, Fox, H, Kalter, A, Kleinknecht, K, Koch, U, Köpke, L, Renk, B, Scheidt, J, Schmidt, J, Schönharting, V, Schué, Y, Wilhelm, R, Winhart, A, Wittgen, M, Chollet, JC, Crépé, S, Iconomidou-Fayard, L, Fayard, L, Ocariz, J, Unal, G, Vattolo, D, Wingerter, I, Anzivino, G, Cenci, P, Lubrano, P, Pepe, M, Gorini, B, Calafiura, P, Carosi, R, Cerri, C, Cirilli, M, Costantini, F, Fantechi, R, Giudici, S, Mannelli, I, Pierazzini, G, Sozzi, M, Cheze, JB, Cogan, J, de Beer, M, Debu, P, Formica, A, Granier de Cassagnac, R, Hristov, P, Mazzucato, E, Peyaud, B, Schanne, S, Turlay, R, Vallage, B, Augustin, I, Bender, M, Holder, M, Ziolkowski, M, Arcidiacono, R, Biino, C, Marchetto, F, Menichetti, E, Nassalski, J, Rondio, E, Szleper, M, Wislicki, W, Wronka, S, Dibon, H, Fischer, G, Jeitler, M, Markytan, M, Mikulec, I, Neuhofer, G, Pernicka, M & Taurok, A 1999, 'Measurement of the decay rate and form factor parameter α_K* in the decay K_L → e⁺e^-γ', Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, vol. 458, no. 4, pp. 553-563. https://doi.org/10.1016/S0370-2693(99)00561-4

Measurement of the decay rate and form factor parameter α_K* in the decay K_L → e⁺e^-γ. / Fanti, V.; Lai, A.; Musa, L.; Marras, D.; Nappi, A.; Hay, B.; Moore, R. W.; Moore, K. N.; Munday, D. J.; Needham, M. D.; Parker, M. A.; White, T. O.; Wotton, S. A.; Barr, G.; Bocquet, G.; Bremer, J.; Ceccucci, A.; Cundy, D.; Doble, N.; Funk, W.; Gatignon, L.; Gianoli, A.; Gonidec, A.; Govi, G.; Grafström, P.; Kubischta, W.; Lacourt, A.; Luitz, S.; Kesseler, G.; Matheys, J. P.; Norton, A.; Palestini, S.; Panzer-Steindel, B.; Schinzel, D.; Taureg, H.; Velasco, M.; Vossnack, O.; Wahl, H.; Wirrer, G.; Kekelidze, V.; Mestvirishvili, A.; Tatishvili, G.; Potrebenikov, I.; Tkatchev, A.; Zinchenko, A.; Boyle, O.; Martin, V. J.; Knowles, I. G.; Parsons, H. L C; Dalpiaz, P.; Duclos, J.; Frabetti, P. L.; Martini, M.; Petrucci, F.; Porcu, M.; Savrié, M.; Bizzeti, A.; Calvetti, M.; Collazuol, G.; Graziani, G.; Iacopini, E.; Lenti, M.; Michetti, A.; Becker, H. G.; Blümer, H.; Buchholz, P.; Coward, D.; Ebersberger, C.; Fox, H.; Kalter, A.; Kleinknecht, K.; Koch, U.; Köpke, L.; Renk, B.; Scheidt, J.; Schmidt, J.; Schönharting, V.; Schué, Y.; Wilhelm, R.; Winhart, A.; Wittgen, M.; Chollet, J. C.; Crépé, S.; Iconomidou-Fayard, L.; Fayard, L.; Ocariz, J.; Unal, G.; Vattolo, D.; Wingerter, I.; Anzivino, G.; Cenci, P.; Lubrano, P.; Pepe, M.; Gorini, B.; Calafiura, P.; Carosi, R.; Cerri, C.; Cirilli, M.; Costantini, F.; Fantechi, R.; Giudici, S.; Mannelli, I.; Pierazzini, G.; Sozzi, M.; Cheze, J. B.; Cogan, J.; de Beer, M.; Debu, P.; Formica, A.; Granier de Cassagnac, R.; Hristov, P.; Mazzucato, E.; Peyaud, B.; Schanne, S.; Turlay, R.; Vallage, B.; Augustin, I.; Bender, M.; Holder, M.; Ziolkowski, M.; Arcidiacono, R.; Biino, C.; Marchetto, F.; Menichetti, E.; Nassalski, J.; Rondio, E.; Szleper, M.; Wislicki, W.; Wronka, S.; Dibon, H.; Fischer, G.; Jeitler, M.; Markytan, M.; Mikulec, I.; Neuhofer, G.; Pernicka, M.; Taurok, A.

In: Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, Vol. 458, No. 4, 1999, p. 553-563.

Research output: Contribution to journal › Article

TY - JOUR

T1 - Measurement of the decay rate and form factor parameter αK* in the decay KL → e+e-γ

AU - Fanti, V.

AU - Lai, A.

AU - Musa, L.

AU - Marras, D.

AU - Nappi, A.

AU - Hay, B.

AU - Moore, R. W.

AU - Moore, K. N.

AU - Munday, D. J.

AU - Needham, M. D.

AU - Parker, M. A.

AU - White, T. O.

AU - Wotton, S. A.

AU - Barr, G.

AU - Bocquet, G.

AU - Bremer, J.

AU - Ceccucci, A.

AU - Cundy, D.

AU - Doble, N.

AU - Funk, W.

AU - Gatignon, L.

AU - Gianoli, A.

AU - Gonidec, A.

AU - Govi, G.

AU - Grafström, P.

AU - Kubischta, W.

AU - Lacourt, A.

AU - Luitz, S.

AU - Kesseler, G.

AU - Matheys, J. P.

AU - Norton, A.

AU - Palestini, S.

AU - Panzer-Steindel, B.

AU - Schinzel, D.

AU - Taureg, H.

AU - Velasco, M.

AU - Vossnack, O.

AU - Wahl, H.

AU - Wirrer, G.

AU - Kekelidze, V.

AU - Mestvirishvili, A.

AU - Tatishvili, G.

AU - Potrebenikov, I.

AU - Tkatchev, A.

AU - Zinchenko, A.

AU - Boyle, O.

AU - Martin, V. J.

AU - Knowles, I. G.

AU - Parsons, H. L C

AU - Dalpiaz, P.

AU - Duclos, J.

AU - Frabetti, P. L.

AU - Martini, M.

AU - Petrucci, F.

AU - Porcu, M.

AU - Savrié, M.

AU - Bizzeti, A.

AU - Calvetti, M.

AU - Collazuol, G.

AU - Graziani, G.

AU - Iacopini, E.

AU - Lenti, M.

AU - Michetti, A.

AU - Becker, H. G.

AU - Blümer, H.

AU - Buchholz, P.

AU - Coward, D.

AU - Ebersberger, C.

AU - Fox, H.

AU - Kalter, A.

AU - Kleinknecht, K.

AU - Koch, U.

AU - Köpke, L.

AU - Renk, B.

AU - Scheidt, J.

AU - Schmidt, J.

AU - Schönharting, V.

AU - Schué, Y.

AU - Wilhelm, R.

AU - Winhart, A.

AU - Wittgen, M.

AU - Chollet, J. C.

AU - Crépé, S.

AU - Iconomidou-Fayard, L.

AU - Fayard, L.

AU - Ocariz, J.

AU - Unal, G.

AU - Vattolo, D.

AU - Wingerter, I.

AU - Anzivino, G.

AU - Cenci, P.

AU - Lubrano, P.

AU - Pepe, M.

AU - Gorini, B.

AU - Calafiura, P.

AU - Carosi, R.

AU - Cerri, C.

AU - Cirilli, M.

AU - Costantini, F.

AU - Fantechi, R.

AU - Giudici, S.

AU - Mannelli, I.

AU - Pierazzini, G.

AU - Sozzi, M.

AU - Cheze, J. B.

AU - Cogan, J.

AU - de Beer, M.

AU - Debu, P.

AU - Formica, A.

AU - Granier de Cassagnac, R.

AU - Hristov, P.

AU - Mazzucato, E.

AU - Peyaud, B.

AU - Schanne, S.

AU - Turlay, R.

AU - Vallage, B.

AU - Augustin, I.

AU - Bender, M.

AU - Holder, M.

AU - Ziolkowski, M.

AU - Arcidiacono, R.

AU - Biino, C.

AU - Marchetto, F.

AU - Menichetti, E.

AU - Nassalski, J.

AU - Rondio, E.

AU - Szleper, M.

AU - Wislicki, W.

AU - Wronka, S.

AU - Dibon, H.

AU - Fischer, G.

AU - Jeitler, M.

AU - Markytan, M.

AU - Mikulec, I.

AU - Neuhofer, G.

AU - Pernicka, M.

AU - Taurok, A.

PY - 1999

Y1 - 1999

N2 - The decay rate of the neutral K meson KL → e+e-γ has been measured with the NA48 detector at the CERN SPS. A total of 6864 events has been observed with an estimated background of 10 events. The branching ratio is Γ(KL → e+e-γ)/Γ(KL → all) = (1.06 ± 0.02stat ± 0.02sys ± 0.04calc) × 10-5 The parameter αK* describing the relative strength of the two contributing amplitudes to this decay through intermediate pseudoscalar or vector mesons was measured to be αK* = -0.36 ± 0.06stat ± 0.02sys.

AB - The decay rate of the neutral K meson KL → e+e-γ has been measured with the NA48 detector at the CERN SPS. A total of 6864 events has been observed with an estimated background of 10 events. The branching ratio is Γ(KL → e+e-γ)/Γ(KL → all) = (1.06 ± 0.02stat ± 0.02sys ± 0.04calc) × 10-5 The parameter αK* describing the relative strength of the two contributing amplitudes to this decay through intermediate pseudoscalar or vector mesons was measured to be αK* = -0.36 ± 0.06stat ± 0.02sys.

UR - http://www.scopus.com/inward/record.url?scp=0000990778&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0000990778&partnerID=8YFLogxK

U2 - 10.1016/S0370-2693(99)00561-4

DO - 10.1016/S0370-2693(99)00561-4

M3 - Article

AN - SCOPUS:0000990778

VL - 458

SP - 553

EP - 563

JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

SN - 0370-2693

IS - 4

ER -