We acknowledge the support of Austrian Federal Ministry of Science, Research and Arts, FNRS–FWO, Belgium, FINEP, CNPq, CAPES, FUJB and FAPERJ, Brazil, Czech Ministry of Industry and Trade, GA CR 202/96/0450 and GA AVCR A1010521, Danish Natural Research Council, Commission of the European Communities (DG XII), Direction des Sciences de la Matire, CEA, France, Bundesministerium fur Bildung, Wissenschaft, Forschung und Technologie, Germany, General Secretariat for Research and Technology, Greece, National Science Foundation (NWO) and Foundation for Research on Matter (FOM), The Netherlands, Norwegian Research Council, State Committee for Scientific Research, Poland, 2P03B00108, 2P03B03311 and 628/E–78–SPUB–P03–023/97, JNICT–Junta Nacional de Investigação Cientifica e Tecnologica, Portugal, Vedecka grantova agentura MS SR, Slovakia, Nr. 95/5195/134, Ministry of Science and Technology of the Republic of Slovenia, CICYT, Spain, AEN96–1661 and AEN96-1681, The Swedish Natural Science Research Council, Particle Physics and Astronomy Research Council, UK, Department of Energy, USA, DE–FG02–94ER40817.

UsingD mesons exclusively reconstructed in theDELPHI detector at LEP, anexcessof 66"14stat. events is )q q y . . 2 observedintheD p p finalstatewithamassof2637"2stat."6syst. MeVrc andafullwidthsmaller than15 2 . )X P y. MeVrc 95%C.L. .Thissignal iscompatiblewiththeexpecteddecayofaradiallyexcitedD Js1 meson.

DELPHI Collaboration: et al.

Peer reviewed