Search for pentaquark states in Z decays
- Authors: SCHAEL S; BARATE R; BRUNELIE; RE R; DE BONIS I; DECAMP D; GOY C; JE; ZE; QUEL S; LEES J-; MARTIN F; MERLE E; MINARD M-; PIETRZYK B; TROCME; B; BRAVO S; CASADO MP; CHMEISSANI M; CRESPO JM; FERNANDEZ E; FERNANDEZ-BOSMAN M; GARRIDO L; MARTINEZ M; PACHECO A; RUIZ H; COLALEO A; CREANZA D; DE FILIPPIS N; DE PALMA M; IASELLI G; MAGGI G; MAGGI M; NUZZO S; RANIERI A; RASO G; RUGGIERI F; SELVAGGI G; SILVESTRIS L; TEMPESTA P; TRICOMI A; ZITO G; HUANG X; LIN J; OUYANG Q; WANG T; XIE Y; XU R; XUE S; ZHANG J; ZHANG L; ZHAO W; ABBANEO D; BARKLOW T; BUCHMU; LLER O; CATTANEO M; CLERBAUX B; DREVERMANN H; FORTY RW; FRANK M; GIANOTTI F; HANSEN JB; HARVEY J; HUTCHCROFT DE; JANOT P; JOST B; KADO M; MATO P; MOUTOUSSI A; RANJARD F; ROLANDI L; SCHLATTER D; SGUAZZONI G; TEUBERT F; VALASSI A; VIDEAU I; BADAUD F; DESSAGNE S; FALVARD A; FAYOLLE D; GAY P; JOUSSET J; MICHEL B; MONTEIL S; PALLIN D; PASCOLO JM; PERRET P; HANSEN JD; HANSEN JR; HANSEN PH; KRAAN AC; NILSSON BS; KYRIAKIS A; MARKOU C; SIMOPOULOU E; VAYAKI A; ZACHARIADOU K; BLONDEL A; BRIENT J-; MACHEFERT F; ROUGE; A; VIDEAU H
- Publication year: 2004
- Type: Articolo in rivista (Articolo in rivista)
- OA Link: http://hdl.handle.net/10447/6839
Abstract
Exotic hadrons made of five quarks (pentaquarks) are searched for in hadronic Z decays collected by the ALEPH detector at LEP. No significant signal is observed. At 95% C.L., upper limits are set on the production rates N of such particles and their charge-conjugate state per Z decay: N Θ(1535)+·BR(Θ(1535)+→pK S 0)<6.2×10-4, N Ε(1862)-·BR(Ε(1862)-→Ε -π-)<4.5×10-4, N Ε(1862)0·BR(Ε(1862)0→Ε -π+)<8.9×10-4, N Θc(3100)0·BR(Θc(3100) 0→D*-p)<6.3×10-4, N Θc(3100)0·BR(Θc(3100) 0→D-p)<31×10-4.