Deuteron and Anti-deuteron Production in e+e- Collisions at the Z Resonance Auteur(s): Schael S., Barate R., Brunelière R., De Bonis I., Decamp D., Goy C., Jézéquel S., Lees J.P., Martin F., Merle E., Minard M.N., Pietrzyk B., Trocmé 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., Rougé A., Videau H., Jacholkowska Agnieszka (Article) Publié: Physics Letters B, vol. 639 p.192-201 (2006) Texte intégral en Openaccess : Ref HAL: in2p3-00080438_v1 Ref Arxiv: hep-ex/0604023 DOI: 10.1016/j.physletb.2006.06.043 Ref. & Cit.: NASA ADS Exporter : BibTex | endNote 41 citations Résumé: Deuteron and anti-deuteron production in Z decays has been observed in the ALEPH experiment at LEP. The production rate of anti-deuterons is measured to be 5.9+-1.8+-0.5 10^-6 per hadronic Z decay in the anti-deuteron momentum range 0.62 to 1.03 GeV/c. The coalescence parameter B_2, which characterizes the likelihood of anti-deuteron production, is measured to be 0.0033+-0.0013 GeV^2 in Z dedays. These measurements indicate that the production of anti-deuterons is suppressed in e+e- collisions compared to pp and photoproduction collisions. |