Observation of the rare decay K-S -> pi(0)e(+)e(-)

6533b7dbfe1ef96bd1270055

RESEARCH PRODUCT

Observation of the rare decay K-S -> pi(0)e(+)e(-)

G. Neuhofer A. Winhart T. Fonseca Martin F. Martelli D.c. Cundy M. De Beer M. Veltri M. Holder S. Goy Lopez E. Iacopini P. Grafström M. Behler M. Valdata G.m. Pierazzini W. Wislicki Roland Winston C. Cerri Leander Litov J.b. Cheze M. Lenti Luca Fiorini P. Debu Nadia Pastrone V. Kekelidze P.l. Frabetti M. Patel P. Cenci S. A. Wotton D. Gurev E. C. Swallow W. Kubischta U. Koch B. Vallage Milene Calvetti Marco Clemencic M.w. Slater P. F. Dalpiaz I. Mannelli L. Gatignon A. Nappi P. Marouelli A. Zinchenko A. Ceccucci A. Maier B. Panzer-steindel D. Madigozhin P. Hristov Evgueni Goudzovski R. Wanke Alan W. Walker J. R. Batley Konrad Kleinknecht C. Cheshkov H. Dibon Wander Baldini M. Savrie M. Sozzi G. Marel A. Peters E. Menichetti M. Scarpa A. Norton Manfred Jeitler G.e. Kalmus R. Sacco Andrea Bizzeti Yu. Potrebenikov Giuseppe Ruggiero M. Eppard A. Dabrowski M. C. Petrucci U. Moosbrugger F. Marchetto Roberta Arcidiacono G. Anzivino V. Falaleev A. Michetti L. Masetti E. Mazzucato P. Lubrano G. Gouge D.j. Munday Cristina Biino Ivan Mikulec F. Costantini Michael Ziolkowski S. Stoynev P. Rubin M. Markytan A. Gianoli G. Bocquet H. D. Wahl G. Graziani N. A. Molokanova F. Petrucci B. Peyaud K. Eppard C. Morales Morales Nicolo Cartiglia M. Piccini G. Lamanna N. Doble M. Martini Mayda Velasco S. Giudici Cristina Lazzeroni E. Imbergamo A. Hirstius A. Gonidec G. Collazuol R. Fantechi L. Widhalm E. Monnier M. Pepe

subject

mesoni K; decadimenti rari Physics Nuclear and High Energy Physics 010308 nuclear & particles physics Branching fraction K-L Form factor (quantum field theory)Analytical chemistry KAON DECAYS 01 natural sciences 3. Good health High Energy Physics - Experiment mesoni K decadimenti rari CP VIOLATION; KAON DECAYS; K-L; SEARCH SEARCH 0103 physical sciences Matrix element CP VIOLATION Atomic physics 010306 general physics

description

A search for the decay Ks->pi0e+e- has been made by the NA48/1 experiment at the CERN SPS accelerator. Using data collected during 89 days in 2002 with a high-intensity Ks beam, 7 events were found with a background of 0.15 events. The branching fraction BR(Ks->pi0e+e-, m(ee) > 0.165 GeV/c^2) = (3.0^{+1.5}_{-1.2}(stat) +/-0.2 (syst)) x 10^{-9} has been measured. Using a vector matrix element and a form factor equal to one, the measurement gives BR(Ks->pi0e+e-) = (5.8^{+2.9}_{-2.4}) x 10^{-9}.

year	journal	country	edition	language
2003-12-01

10.1016/j.physletb.2003.10.001 http://hdl.handle.net/2318/110488