Measurement of the KL→e+e−e+e− decay rate

6533b822fe1ef96bd127d60a

RESEARCH PRODUCT

Measurement of the KL→e+e−e+e− decay rate

M. Wittgen Rainer Wanke J. Cogan T. ÇUhadar J. C. Chollet U. Koch M. Markytan M. Lenti I.g. Knowles A. Winhart G. Tatishvili Mauro Piccini S. Giudici R. Fantechi S. Wronka I. Wingerter-seez Milene Calvetti Nicolo Cartiglia R.s. Dosanjh Michael Andrew Parker G.m. Pierazzini G. Govi N. A. Molokanova A. Kalter M. Eppard H. D. Wahl P. Lubrano Adrian John Bevan T.o. White W. Kubischta B. Hay G. Unal Vladimir Kekelidze K. Eppard H. Dibon I. Mannelli S.a. Schmidt E. Rondio B. Peyaud V. Schönharting Roberta Arcidiacono E. Imbergamo G. Graziani P. F. Dalpiaz Fabrizio Petrucci Nadia Pastrone R. Casali H. Taureg R. Turlay D. Marras Augusto Ceccucci P.l. Frabetti B. Vallage M. Contalbrigo I. Melzer-pellmann Alexi Mestvirishvili J. Ocariz T.j. Gershon M. Sozzi Benedetto Gorini C. Cheshkov A. I. Zinchenko Louis Fayard J.b. Cheze F. Marchetto B. Renk V. Falaleev Manfred Jeitler H.g. Becker Alan W. Walker A. Gianoli Sandro Palestini E. Iacopini A. Maier P. Hristov J. Duclos G. Anzivino M. Cirilli Niels Doble Andrea Bizzeti Cristina Biino Ivan Mikulec A. Peters Konrad Kleinknecht Luca Fiorini R. Granier De Cassagnac G. Neuhofer P. Grafström G. Bocquet Yu. Potrebenikov Michael Ziolkowski G.d. Barr D.c. Cundy G. Lamanna D. Madigojine M. Holder C. Cerri L. Widhalm M. Pernicka L. Köpke Victoria Jane Martin Y. Schué A. Lai Andrea Formica Mayda Velasco P. Debu E. Olaiya Lau Gatignon F. Costantini G. Ruggiero A. Nappi E. Mazzucato S. A. Wotton R. Sacco Michal Szleper Wojciech Wislicki A. Gonidec Cristina Lazzeroni M. Savrie P. Cenci G. Collazuol G. Fischer E. Menichetti Anton Taurok G.e. Kalmus M. De Beer M. Martini M. Pepe G. D'agostini M.d. Needham A. Norton D.j. Munday J. Nassalski H. Fox P. Lopes Da Silva Lydia Iconomidou-fayard P. Marouelli A. Lacourt B. Panzer-steindel

subject

Physics Nuclear and High Energy Physics Meson Branching fraction Analytical chemistry Atomic physics Positron annihilation

description

Abstract The decay rate of the long-lived neutral K meson into the e + e − e + e − final state has been measured with the NA48 detector at the CERN SPS. Using data collected in 1998 and 1999, a total of 200 events has been observed with negligible background. This observation corresponds to a branching ratio of Br ( K L → e + e − e + e − ) = ( 3.30 ± 0.24 stat ± 0.23 syst ± 0.10 norm ) × 10 −8 .

year	journal	country	edition	language
2005-05-01	Physics Letters B

https://doi.org/10.1016/j.physletb.2005.03.078