Observation of the decay KS → π+π-e+e-

A. Lai; D. Marras; L. Musa; A. Bevan; R. S. Dosanjh; T. J. Gershon; B. Hay; G. E. Kalmus; D. J. Munday; M. D. Needham; E. Olaiya; M. A. Parker; T. O. White; S. A. Wotton; G. Barr; H. Blümer; G. Bocquet; A. Ceccucci; D. Cundy; G. D'Agostini; N. Doble; V. Falaleev; L. Gatignon; A. Gonidec; G. Govi; P. Grafström; W. Kubischta; A. Lacourt; A. Norton; S. Palestini; B. Panzer-Steindel; B. Peyaud; H. Taureg; M. Velasco; H. Wahl; C. Cheshkov; P. Hristov; V. Kekelidze; D. Madigojine; A. Mestvirishvili; N. Molokanova; Y. Potrebenikov; G. Tatishvili; A. Tkatchev; A. Zinchenko; I. Knowles; V. Martin; H. Parsons; R. Sacco; C. Lazzeroni; A. Walker; M. Contalbrigo; P. Dalpiaz; J. Duclos; P. L. Frabetti; A. Gianoli; M. Martini; F. Petrucci; M. Savrié; A. Bizzeti; M. Calvetti; G. Collazuol; G. Graziani; E. Iacopini; M. Lenti; H. G. Becker; M. Eppard; H. Fox; K. Holtz; A. Kalter; K. Kleinknecht; U. Koch; L. Köpke; I. Pellmann; A. Peters; B. Renk; S. A. Schmidt; V. Schönharting; Y. Schué; A. Winhart; M. Wittgen; J. C. Chollet; S. Crépé; L. Fayard; L. Iconomidou-Fayard; J. Ocariz; G. Unal; I. Wingerter-Seez; G. Anzivino; P. Cenci; E. Imbergamo; P. Lubrano; A. Nappi; M. Pepe; M. Piccini; R. Carosi; R. Casali; C. Cerri; M. Cirilli; F. Costantini; R. Fantechi; S. Giudici; B. Gorini; I. Mannelli; G. Pierazzini; M. Sozzi; J. B. Cheze; J. Cogan; M. de Beer; P. Debu; A. Formica; R. Granier de Cassagnac; E. Mazzucato; R. Turlay; B. Vallage; I. Augustin; M. Bender; M. Holder; M. Ziolkowski; R. Arcidiacono; C. Biino; F. Marchetto; E. Menichetti; N. Pastrone; 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(00)01300-9

Observation of the decay K_S → π⁺π^-e⁺e^-

A. Lai, D. Marras, L. Musa, A. Bevan, R. S. Dosanjh, T. J. Gershon, B. Hay, G. E. Kalmus, D. J. Munday, M. D. Needham, E. Olaiya, M. A. Parker, T. O. White, S. A. Wotton, G. Barr, H. Blümer, G. Bocquet, A. Ceccucci, D. Cundy, G. D'AgostiniN. Doble, V. Falaleev, L. Gatignon, A. Gonidec, G. Govi, P. Grafström, W. Kubischta, A. Lacourt, A. Norton, S. Palestini, B. Panzer-Steindel, B. Peyaud, H. Taureg, M. Velasco, H. Wahl, C. Cheshkov, P. Hristov, V. Kekelidze, D. Madigojine, A. Mestvirishvili, N. Molokanova, Y. Potrebenikov, G. Tatishvili, A. Tkatchev, A. Zinchenko, I. Knowles, V. Martin, H. Parsons, R. Sacco, C. Lazzeroni, A. Walker, M. Contalbrigo, P. Dalpiaz, J. Duclos, P. L. Frabetti, A. Gianoli, M. Martini, F. Petrucci, M. Savrié, A. Bizzeti, M. Calvetti, G. Collazuol, G. Graziani, E. Iacopini, M. Lenti, H. G. Becker, M. Eppard, H. Fox, K. Holtz, A. Kalter, K. Kleinknecht, U. Koch, L. Köpke, I. Pellmann, A. Peters, B. Renk, S. A. Schmidt, V. Schönharting, Y. Schué, A. Winhart, M. Wittgen, J. C. Chollet, S. Crépé, L. Fayard, L. Iconomidou-Fayard, J. Ocariz, G. Unal, I. Wingerter-Seez, G. Anzivino, P. Cenci, E. Imbergamo, P. Lubrano, A. Nappi, M. Pepe, M. Piccini, R. Carosi, R. Casali, C. Cerri, M. Cirilli, F. Costantini, R. Fantechi, S. Giudici, B. Gorini, I. Mannelli, G. Pierazzini, M. Sozzi, J. B. Cheze, J. Cogan, M. de Beer, P. Debu, A. Formica, R. Granier de Cassagnac, E. Mazzucato^*, R. Turlay, B. Vallage, I. Augustin, M. Bender, M. Holder, M. Ziolkowski, R. Arcidiacono, C. Biino, F. Marchetto, E. Menichetti, N. Pastrone, 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 › peer-review

14 Scopus citations

Abstract

We present the first observation of the decay K_S → π⁺π^-e⁺e^- based upon the data collected in 1998 by the NA48 experiment at CERN. We have identified a clean sample of 56 events with negligible background contamination. Using K_L → π⁺π^-π_D/⁰ decays as normalization sample, the branching ratio is measured to be BR(K_S → π⁺π^-e⁺e^-) = [4,5 ± 0.7 (stat) ± 0.4(syst)] × 10^-5. This result is in good agreement with the theoretical expectations from the mechanism of inner bremsstrahlung.

Original language	English (US)
Pages (from-to)	137-144
Number of pages	8
Journal	Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume	496
Issue number	3-4
DOIs	https://doi.org/10.1016/S0370-2693(00)01300-9
State	Published - Dec 28 2000

ASJC Scopus subject areas

Nuclear and High Energy Physics

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10.1016/S0370-2693(00)01300-9

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Lai, A., Marras, D., Musa, L., Bevan, A., Dosanjh, R. S., Gershon, T. J., Hay, B., Kalmus, G. E., Munday, D. J., Needham, M. D., Olaiya, E., Parker, M. A., White, T. O., Wotton, S. A., Barr, G., Blümer, H., Bocquet, G., Ceccucci, A., Cundy, D., ... Taurok, A. (2000). Observation of the decay K_S → π⁺π^-e⁺e^- Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 496(3-4), 137-144. https://doi.org/10.1016/S0370-2693(00)01300-9

Lai, A. ; Marras, D. ; Musa, L. ; Bevan, A. ; Dosanjh, R. S. ; Gershon, T. J. ; Hay, B. ; Kalmus, G. E. ; Munday, D. J. ; Needham, M. D. ; Olaiya, E. ; Parker, M. A. ; White, T. O. ; Wotton, S. A. ; Barr, G. ; Blümer, H. ; Bocquet, G. ; Ceccucci, A. ; Cundy, D. ; D'Agostini, G. ; Doble, N. ; Falaleev, V. ; Gatignon, L. ; Gonidec, A. ; Govi, G. ; Grafström, P. ; Kubischta, W. ; Lacourt, A. ; Norton, A. ; Palestini, S. ; Panzer-Steindel, B. ; Peyaud, B. ; Taureg, H. ; Velasco, M. ; Wahl, H. ; Cheshkov, C. ; Hristov, P. ; Kekelidze, V. ; Madigojine, D. ; Mestvirishvili, A. ; Molokanova, N. ; Potrebenikov, Y. ; Tatishvili, G. ; Tkatchev, A. ; Zinchenko, A. ; Knowles, I. ; Martin, V. ; Parsons, H. ; Sacco, R. ; Lazzeroni, C. ; Walker, A. ; Contalbrigo, M. ; Dalpiaz, P. ; Duclos, J. ; Frabetti, P. L. ; Gianoli, A. ; Martini, M. ; Petrucci, F. ; Savrié, M. ; Bizzeti, A. ; Calvetti, M. ; Collazuol, G. ; Graziani, G. ; Iacopini, E. ; Lenti, M. ; Becker, H. G. ; Eppard, M. ; Fox, H. ; Holtz, K. ; Kalter, A. ; Kleinknecht, K. ; Koch, U. ; Köpke, L. ; Pellmann, I. ; Peters, A. ; Renk, B. ; Schmidt, S. A. ; Schönharting, V. ; Schué, Y. ; Winhart, A. ; Wittgen, M. ; Chollet, J. C. ; Crépé, S. ; Fayard, L. ; Iconomidou-Fayard, L. ; Ocariz, J. ; Unal, G. ; Wingerter-Seez, I. ; Anzivino, G. ; Cenci, P. ; Imbergamo, E. ; Lubrano, P. ; Nappi, A. ; Pepe, M. ; Piccini, M. ; Carosi, R. ; Casali, R. ; Cerri, C. ; Cirilli, M. ; Costantini, F. ; Fantechi, R. ; Giudici, S. ; Gorini, B. ; Mannelli, I. ; Pierazzini, G. ; Sozzi, M. ; Cheze, J. B. ; Cogan, J. ; de Beer, M. ; Debu, P. ; Formica, A. ; Granier de Cassagnac, R. ; Mazzucato, E. ; Turlay, R. ; Vallage, B. ; Augustin, I. ; Bender, M. ; Holder, M. ; Ziolkowski, M. ; Arcidiacono, R. ; Biino, C. ; Marchetto, F. ; Menichetti, E. ; Pastrone, N. ; 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. / Observation of the decay K_S → π⁺π^-e⁺e^- In: Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics. 2000 ; Vol. 496, No. 3-4. pp. 137-144.

@article{2888c255e3aa403c8b979b727f6f87c2,

title = "Observation of the decay KS → π+π-e+e- ",

abstract = "We present the first observation of the decay KS → π+π-e+e- based upon the data collected in 1998 by the NA48 experiment at CERN. We have identified a clean sample of 56 events with negligible background contamination. Using KL → π+π-πD/0 decays as normalization sample, the branching ratio is measured to be BR(KS → π+π-e+e-) = [4,5 ± 0.7 (stat) ± 0.4(syst)] × 10-5. This result is in good agreement with the theoretical expectations from the mechanism of inner bremsstrahlung.",

author = "A. Lai and D. Marras and L. Musa and A. Bevan and Dosanjh, {R. S.} and Gershon, {T. J.} and B. Hay and Kalmus, {G. E.} and Munday, {D. J.} and Needham, {M. D.} and E. Olaiya and Parker, {M. A.} and White, {T. O.} and Wotton, {S. A.} and G. Barr and H. Bl{\"u}mer and G. Bocquet and A. Ceccucci and D. Cundy and G. D'Agostini and N. Doble and V. Falaleev and L. Gatignon and A. Gonidec and G. Govi and P. Grafstr{\"o}m and W. Kubischta and A. Lacourt and A. Norton and S. Palestini and B. Panzer-Steindel and B. Peyaud and H. Taureg and M. Velasco and H. Wahl and C. Cheshkov and P. Hristov and V. Kekelidze and D. Madigojine and A. Mestvirishvili and N. Molokanova and Y. Potrebenikov and G. Tatishvili and A. Tkatchev and A. Zinchenko and I. Knowles and V. Martin and H. Parsons and R. Sacco and C. Lazzeroni and A. Walker and M. Contalbrigo and P. Dalpiaz and J. Duclos and Frabetti, {P. L.} and A. Gianoli and M. Martini and F. Petrucci and M. Savri{\'e} and A. Bizzeti and M. Calvetti and G. Collazuol and G. Graziani and E. Iacopini and M. Lenti and Becker, {H. G.} and M. Eppard and H. Fox and K. Holtz and A. Kalter and K. Kleinknecht and U. Koch and L. K{\"o}pke and I. Pellmann and A. Peters and B. Renk and Schmidt, {S. A.} and V. Sch{\"o}nharting and Y. Schu{\'e} and A. Winhart and M. Wittgen and Chollet, {J. C.} and S. Cr{\'e}p{\'e} and L. Fayard and L. Iconomidou-Fayard and J. Ocariz and G. Unal and I. Wingerter-Seez and G. Anzivino and P. Cenci and E. Imbergamo and P. Lubrano and A. Nappi and M. Pepe and M. Piccini and R. Carosi and R. Casali and C. Cerri and M. Cirilli and F. Costantini and R. Fantechi and S. Giudici and B. Gorini 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 E. Mazzucato 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 N. Pastrone 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 = "2000",

month = dec,

day = "28",

doi = "10.1016/S0370-2693(00)01300-9",

language = "English (US)",

volume = "496",

pages = "137--144",

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

issn = "0370-2693",

publisher = "Elsevier",

number = "3-4",

}

Lai, A, Marras, D, Musa, L, Bevan, A, Dosanjh, RS, Gershon, TJ, Hay, B, Kalmus, GE, Munday, DJ, Needham, MD, Olaiya, E, Parker, MA, White, TO, Wotton, SA, Barr, G, Blümer, H, Bocquet, G, Ceccucci, A, Cundy, D, D'Agostini, G, Doble, N, Falaleev, V, Gatignon, L, Gonidec, A, Govi, G, Grafström, P, Kubischta, W, Lacourt, A, Norton, A, Palestini, S, Panzer-Steindel, B, Peyaud, B, Taureg, H, Velasco, M, Wahl, H, Cheshkov, C, Hristov, P, Kekelidze, V, Madigojine, D, Mestvirishvili, A, Molokanova, N, Potrebenikov, Y, Tatishvili, G, Tkatchev, A, Zinchenko, A, Knowles, I, Martin, V, Parsons, H, Sacco, R, Lazzeroni, C, Walker, A, Contalbrigo, M, Dalpiaz, P, Duclos, J, Frabetti, PL, Gianoli, A, Martini, M, Petrucci, F, Savrié, M, Bizzeti, A, Calvetti, M, Collazuol, G, Graziani, G, Iacopini, E, Lenti, M, Becker, HG, Eppard, M, Fox, H, Holtz, K, Kalter, A, Kleinknecht, K, Koch, U, Köpke, L, Pellmann, I, Peters, A, Renk, B, Schmidt, SA, Schönharting, V, Schué, Y, Winhart, A, Wittgen, M, Chollet, JC, Crépé, S, Fayard, L, Iconomidou-Fayard, L, Ocariz, J, Unal, G, Wingerter-Seez, I, Anzivino, G, Cenci, P, Imbergamo, E, Lubrano, P, Nappi, A, Pepe, M, Piccini, M, Carosi, R, Casali, R, Cerri, C, Cirilli, M, Costantini, F, Fantechi, R, Giudici, S, Gorini, B, Mannelli, I, Pierazzini, G, Sozzi, M, Cheze, JB, Cogan, J, de Beer, M, Debu, P, Formica, A, Granier de Cassagnac, R, Mazzucato, E, Turlay, R, Vallage, B, Augustin, I, Bender, M, Holder, M, Ziolkowski, M, Arcidiacono, R, Biino, C, Marchetto, F, Menichetti, E, Pastrone, N, 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 2000, 'Observation of the decay K_S → π⁺π^-e⁺e^- ', Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, vol. 496, no. 3-4, pp. 137-144. https://doi.org/10.1016/S0370-2693(00)01300-9

Observation of the decay K_S → π⁺π^-e⁺e^- . / Lai, A.; Marras, D.; Musa, L.; Bevan, A.; Dosanjh, R. S.; Gershon, T. J.; Hay, B.; Kalmus, G. E.; Munday, D. J.; Needham, M. D.; Olaiya, E.; Parker, M. A.; White, T. O.; Wotton, S. A.; Barr, G.; Blümer, H.; Bocquet, G.; Ceccucci, A.; Cundy, D.; D'Agostini, G.; Doble, N.; Falaleev, V.; Gatignon, L.; Gonidec, A.; Govi, G.; Grafström, P.; Kubischta, W.; Lacourt, A.; Norton, A.; Palestini, S.; Panzer-Steindel, B.; Peyaud, B.; Taureg, H.; Velasco, M.; Wahl, H.; Cheshkov, C.; Hristov, P.; Kekelidze, V.; Madigojine, D.; Mestvirishvili, A.; Molokanova, N.; Potrebenikov, Y.; Tatishvili, G.; Tkatchev, A.; Zinchenko, A.; Knowles, I.; Martin, V.; Parsons, H.; Sacco, R.; Lazzeroni, C.; Walker, A.; Contalbrigo, M.; Dalpiaz, P.; Duclos, J.; Frabetti, P. L.; Gianoli, A.; Martini, M.; Petrucci, F.; Savrié, M.; Bizzeti, A.; Calvetti, M.; Collazuol, G.; Graziani, G.; Iacopini, E.; Lenti, M.; Becker, H. G.; Eppard, M.; Fox, H.; Holtz, K.; Kalter, A.; Kleinknecht, K.; Koch, U.; Köpke, L.; Pellmann, I.; Peters, A.; Renk, B.; Schmidt, S. A.; Schönharting, V.; Schué, Y.; Winhart, A.; Wittgen, M.; Chollet, J. C.; Crépé, S.; Fayard, L.; Iconomidou-Fayard, L.; Ocariz, J.; Unal, G.; Wingerter-Seez, I.; Anzivino, G.; Cenci, P.; Imbergamo, E.; Lubrano, P.; Nappi, A.; Pepe, M.; Piccini, M.; Carosi, R.; Casali, R.; Cerri, C.; Cirilli, M.; Costantini, F.; Fantechi, R.; Giudici, S.; Gorini, B.; Mannelli, I.; Pierazzini, G.; Sozzi, M.; Cheze, J. B.; Cogan, J.; de Beer, M.; Debu, P.; Formica, A.; Granier de Cassagnac, R.; Mazzucato, E.; Turlay, R.; Vallage, B.; Augustin, I.; Bender, M.; Holder, M.; Ziolkowski, M.; Arcidiacono, R.; Biino, C.; Marchetto, F.; Menichetti, E.; Pastrone, N.; 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. 496, No. 3-4, 28.12.2000, p. 137-144.

Research output: Contribution to journal › Article › peer-review

TY - JOUR

T1 - Observation of the decay KS → π+π-e+e-

AU - Lai, A.

AU - Marras, D.

AU - Musa, L.

AU - Bevan, A.

AU - Dosanjh, R. S.

AU - Gershon, T. J.

AU - Hay, B.

AU - Kalmus, G. E.

AU - Munday, D. J.

AU - Needham, M. D.

AU - Olaiya, E.

AU - Parker, M. A.

AU - White, T. O.

AU - Wotton, S. A.

AU - Barr, G.

AU - Blümer, H.

AU - Bocquet, G.

AU - Ceccucci, A.

AU - Cundy, D.

AU - D'Agostini, G.

AU - Doble, N.

AU - Falaleev, V.

AU - Gatignon, L.

AU - Gonidec, A.

AU - Govi, G.

AU - Grafström, P.

AU - Kubischta, W.

AU - Lacourt, A.

AU - Norton, A.

AU - Palestini, S.

AU - Panzer-Steindel, B.

AU - Peyaud, B.

AU - Taureg, H.

AU - Velasco, M.

AU - Wahl, H.

AU - Cheshkov, C.

AU - Hristov, P.

AU - Kekelidze, V.

AU - Madigojine, D.

AU - Mestvirishvili, A.

AU - Molokanova, N.

AU - Potrebenikov, Y.

AU - Tatishvili, G.

AU - Tkatchev, A.

AU - Zinchenko, A.

AU - Knowles, I.

AU - Martin, V.

AU - Parsons, H.

AU - Sacco, R.

AU - Lazzeroni, C.

AU - Walker, A.

AU - Contalbrigo, M.

AU - Dalpiaz, P.

AU - Duclos, J.

AU - Frabetti, P. L.

AU - Gianoli, A.

AU - Martini, M.

AU - Petrucci, F.

AU - Savrié, M.

AU - Bizzeti, A.

AU - Calvetti, M.

AU - Collazuol, G.

AU - Graziani, G.

AU - Iacopini, E.

AU - Lenti, M.

AU - Becker, H. G.

AU - Eppard, M.

AU - Fox, H.

AU - Holtz, K.

AU - Kalter, A.

AU - Kleinknecht, K.

AU - Koch, U.

AU - Köpke, L.

AU - Pellmann, I.

AU - Peters, A.

AU - Renk, B.

AU - Schmidt, S. A.

AU - Schönharting, V.

AU - Schué, Y.

AU - Winhart, A.

AU - Wittgen, M.

AU - Chollet, J. C.

AU - Crépé, S.

AU - Fayard, L.

AU - Iconomidou-Fayard, L.

AU - Ocariz, J.

AU - Unal, G.

AU - Wingerter-Seez, I.

AU - Anzivino, G.

AU - Cenci, P.

AU - Imbergamo, E.

AU - Lubrano, P.

AU - Nappi, A.

AU - Pepe, M.

AU - Piccini, M.

AU - Carosi, R.

AU - Casali, R.

AU - Cerri, C.

AU - Cirilli, M.

AU - Costantini, F.

AU - Fantechi, R.

AU - Giudici, S.

AU - Gorini, B.

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 - Mazzucato, E.

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 - Pastrone, N.

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 - 2000/12/28

Y1 - 2000/12/28

N2 - We present the first observation of the decay KS → π+π-e+e- based upon the data collected in 1998 by the NA48 experiment at CERN. We have identified a clean sample of 56 events with negligible background contamination. Using KL → π+π-πD/0 decays as normalization sample, the branching ratio is measured to be BR(KS → π+π-e+e-) = [4,5 ± 0.7 (stat) ± 0.4(syst)] × 10-5. This result is in good agreement with the theoretical expectations from the mechanism of inner bremsstrahlung.

AB - We present the first observation of the decay KS → π+π-e+e- based upon the data collected in 1998 by the NA48 experiment at CERN. We have identified a clean sample of 56 events with negligible background contamination. Using KL → π+π-πD/0 decays as normalization sample, the branching ratio is measured to be BR(KS → π+π-e+e-) = [4,5 ± 0.7 (stat) ± 0.4(syst)] × 10-5. This result is in good agreement with the theoretical expectations from the mechanism of inner bremsstrahlung.

UR - http://www.scopus.com/inward/record.url?scp=0034727840&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0034727840&partnerID=8YFLogxK

U2 - 10.1016/S0370-2693(00)01300-9

DO - 10.1016/S0370-2693(00)01300-9

M3 - Article

AN - SCOPUS:0034727840

VL - 496

SP - 137

EP - 144

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 - 3-4

ER -

Observation of the decay K_S → π⁺π^-e⁺e^-

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