ITA
ENG

Measurement of the decay rate and form factor parameter alpha(K*) in the decay K-L -> e(+)e(-)gamma

Authors

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 Grafstrom, 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 Dalpaiz, P Duclos, J Frabetti, PL Martini, M Petrucci, F Porcu, M Savrie, M Bizzeti, A Calvetti, M Collazuol, G Graziani, G Iacopini, E Lenti, M Michetti, A Becker, HG Blumer, H Buchholz, P Coward, D Ebersberger, C Fox, H Kalter, A Kleinknecht, K Koch, U Kopke, L Renk, B Scheidt, J Schmidt, J Schonharting, V Schue, Y Wilhelm, R Winhart, A Wittgen, M Chollet, JC Crepe, 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 de Cassagnac, RG 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

Citation

V. Fanti et al., Measurement of the decay rate and form factor parameter alpha(K*) in the decay K-L -> e(+)e(-)gamma, PHYS LETT B, 458(4), 1999, pp. 553-563

Citations number

Categorie Soggetti

Physics

Journal title

PHYSICS LETTERS B

ISSN journal

03702693 → ACNP

Volume

458

Issue

Year of publication

1999

Pages

553 - 563

Database

ISI

SICI code

0370-2693(19990715)458:4<553:MOTDRA>2.0.ZU;2-2

Abstract

The decay rate of the neutral K meson K-L --> e(+)e(-)gamma has been measur ed 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 Gamma(K-L --> e(+)e(-)gamma)/Gamma(K-L --> all) = (1.06 +/- 0.02(stat) +/- 0.02(sys) +/- 0.04(calc)) X 10(-5). The parameter alpha(K*) describing the relative strength of the two contributing amplitudes to this decay through intermediate pseudoscalar or vector mesons was measured to be alpha(K*) = - 0.36 +/- 0.06(stat) +/- 0.02(sys). (C) 1999 Published by Elsevier Science B .V. All rights reserved.