Search for pentaquark states in Z decays Author(s): Schael S., Barate R., Bruneliere R., De Bonis I., Decamp D., Goy C., Jezequel S., Lees J P., Martin F., Merle E., Minard M N., Pietrzyk B., Trocme B., Badaud F., Dessagne S., Falvard Alain, Fayolle D., Gay P., Jousset J., Michel B., Monteil S., Pallin D., Pascolo J M., Perret P., Blondel A., Brient J C., Machefert F., Rouge A., Videau H., Jacholkowska Agnieszka (Article) Published: Physics Letters B, vol. 599 p.1-16 (2004) Links openAccess full text : Ref HAL: in2p3-00021800_v1 DOI: 10.1016/j.physletb.2004.08.021 Exporter : BibTex | endNote 68 citations 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 Theta(1535)+ . BR(Theta(1535)^+ -> pK0s < 6.2 x 10^-4, N Xi(1862)-- . BR(Xi(1862)^-- -> xi^- pi^-) < 4.5 x 10^-4, N Xi(1862)^0 . BR(Xi(1862)^0 -> Xi^-pi^+ < 8.9 x 10^-4, N Theta_c(3100)^0 . BR(Theta_c(3100)^0 -> D*-p) < 6.3 x 10^-4, N Theta_c(3100)^0 . BR(Theta_c(3100)^0 -> D^-p) < 31 x 10^-4. Comments: LAL 04-99 |