First observation of the KS → π0γ γ decay

6533b7d2fe1ef96bd125e1b6

RESEARCH PRODUCT

First observation of the KS → π0γ γ decay

Augusto Ceccucci E. Olaiya M. Markytan M. Lenti T. Cuhadar-dönszelmann E. Iacopini P. Lubrano P. Grafström Rainer Wanke S.a. Schmidt E. Mazzucato R.s. Dosanjh E. Imbergamo A. Gonidec A. Lacourt D. Madigojine Nadia Pastrone P. Debu D. Marras M. De Beer G. Tatishvili R. Fantechi B. Vallage G. Collazuol M. Holder G.m. Pierazzini K. Holtz Milene Calvetti J. R. Batley I. Mannelli Victoria Jane Martin M. Pernicka M. Eppard C. Cheshkov H. Dibon B. Panzer-steindel P. Rubin M. Sozzi S. A. Wotton A. Peters J. Nassalski A. Hirstius Michal Szleper J.b. Cheze Cristina Biino Ivan Mikulec Roberta Arcidiacono C. Cerri Luca Fiorini A. Winhart G. Bocquet Yu. Potrebenikov Mauro Piccini M. Savrie A. I. Zinchenko E. Menichetti G. Marel A. Lai G.e. Kalmus R. Casali A. Gianoli R. Granier De Cassagnac M. Wittgen Benedetto Gorini Andrea Formica I. Pellmann Cristina Lazzeroni N. A. Molokanova F. Derue Konrad Kleinknecht Anton Taurok M. Cirilli Niels Doble T.o. White G. Graziani V. Falaleev Louis Fayard F. Marchetto R. Sacco G. Neuhofer Lau Gatignon I. Wingerter-seez Manfred Jeitler J. Duclos G. Unal Andrea Bizzeti G. Anzivino W. Kubischta I. Mestvirishvili G. Gouge F. Costantini H. D. Wahl F. Martelli D.c. Cundy B. Peyaud S. Wronka Alexi Mestvirishvili Vladimir Kekelidze L. Widhalm P. Cenci Y. Schué Fabrizio Petrucci J. C. Chollet A. Nappi M. Contalbrigo M. Martini Michael Ziolkowski P.l. Frabetti U. Koch S. Giudici A. Maier P. Hristov Nicolo Cartiglia Michael Andrew Parker G.d. Barr Alan W. Walker L. Köpke W. Wislicki V. Schönharting E. Rondio P. F. Dalpiaz M. Pepe T.j. Gershon D.j. Munday P. Lopes Da Silva Lydia Iconomidou-fayard P. Marouelli M. Veltri A. Norton R. Turlay

subject

Physics Nuclear and High Energy Physics Particle physics Chiral perturbation theory Large Hadron Collider decadimenti 010308 nuclear & particles physics Branching fraction Detector 01 natural sciences mesoni K Nuclear physics mesoni K; decadimenti 0103 physical sciences 010306 general physics

description

Using the NA48 detector at the CERN SPS, 31 KS → π 0γγ candidates with an estimated background of 13.7 ± 3.2 events have been observed. This first observation leads to a branching ratio of BR(KS → π0γγ) z>0.2 = (4.9 ± 1.6stat ± 0.9 syst) × 10-8 in agreement with Chiral Perturbation Theory predictions. © 2003 Elsevier B.V. All rights reserved.

year	journal	country	edition	language
2004-01-01	Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

10.1016/j.physletb.2003.10.073 http://ora.ox.ac.uk/objects/uuid:80fe18cb-d710-490e-bf1b-afa0394f9b18