Measurement of the decay rate and form factor parameter in the decay KL→e+e−γ

6533b85afe1ef96bd12b9ee1

RESEARCH PRODUCT

Measurement of the decay rate and form factor parameter in the decay KL→e+e−γ

H.g. Becker Cristina Biino Ivan Mikulec Vladimir Kekelidze R. Turlay M. Holder D. Marras G. Fischer A. Gonidec A. I. Zinchenko Michael Ziolkowski S. Luitz I. Potrebenikov Anton Taurok G. Collazuol M. Sozzi S. A. Wotton E. Iacopini G. Govi Konrad Kleinknecht S. Schanne A. Gianoli Paolo Calafiura Matthew Needham B. Vallage P. Grafström R.w. Moore I. Mannelli J. Nassalski R. Granier De Cassagnac A. Lai Andrea Formica G. Kesseler J.b. Cheze M. Cirilli Niels Doble W. Kubischta Michal Szleper O. Boyle P. F. Dalpiaz A. Nappi P. Hristov P. Lubrano P. Debu R. Fantechi H. D. Wahl Giacomo Graziani A. Mestvirishvili M. Savrie U. Koch A. Winhart Louis Fayard G. Neuhofer F. Marchetto J. C. Chollet F. Costantini D. J. Munday Milene Calvetti H. Blümer L. Köpke M. Bender I.g. Knowles P. Buchholz E. Menichetti A. Kalter B. Peyaud M. Martini Lydia Iconomidou-fayard D. Schinzel J. Scheidt B. Hay Victoria Jane Martin W. Wislicki Michael Andrew Parker S. Giudici M. De Beer E. Rondio H. Dibon J. Ocariz Roberta Arcidiacono G.d. Barr H. Taureg B. Renk Augusto Ceccucci S. Wronka Mayda Velasco V. Fanti I. Wingerter V. Schönharting G. Tatishvili O. Vossnack Lau Gatignon Benedetto Gorini G. Unal M. Porcu A. Tkatchev M. Pepe D. Coward Manfred Jeitler J.p. Matheys C. Cerri J. Schmidt Luciano Musa G. Bocquet I. Augustin K.n. Moore J. Duclos Andrea Bizzeti P. Cenci J. Bremer G. Anzivino A. Norton M. Pernicka C. Ebersberger G. Wirrer D. Vattolo S. Crépé E. Mazzucato M. Markytan M. Lenti H. Fox A. Lacourt R. Wilhelm B. Panzer-steindel Fabrizio Petrucci P.l. Frabetti T. O. White H. Parsons Sandro Palestini A. Michetti Wolfgang Funk R. Carosi D.c. Cundy Y. Schué G.m. Pierazzini M. Wittgen J. Cogan

subject

Pseudoscalar Physics Nuclear physics Nuclear and High Energy Physics Amplitude Meson Branching fraction Form factor (quantum field theory)Alpha (ethology)Relative strength

description

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 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±0.06stat±0.02sys.

year	journal	country	edition	language
1999-07-01	Physics Letters B

https://doi.org/10.1016/s0370-2693(99)00561-4