208 articles – 1940 Notices  [english version]
 HAL : in2p3-00025064, version 1
 arXiv : hep-ph/0507051
 Physical Review D 74 (2006) 034024
 Microcanonical pentaquark production in electron-positron annihilations
 (2006)
 The existence of pentaquarks, namely baryonic states made up of four quarks and one antiquark, became questionable, because the candidates, i.e. the $\Theta^+$ peak, are seen in certain reactions, i.e. p+p collisions, but not in others, i.e. $\ee$ annihilations. In this paper, we calculate the production of $\Theta ^{+}(1540)$ and $\Xi (1860)$ in $\ee$ annihilations at 91.2 GeV with a microcanonical approach. A rather high production of pentaquark states is obtained. It is comparable with that from pp collisions at RHIC energy, and higher than the yield from pp collisions at SPS energy. If pentaquark states exist, the production is highly possible from high energy collisions, even without initial baryons.
 Thème(s) : Physique/Physique des Hautes Energies - Phénoménologie
 Lien vers le texte intégral : http://fr.arXiv.org/abs/hep-ph/0507051
 in2p3-00025064, version 1 http://hal.in2p3.fr/in2p3-00025064 oai:hal.in2p3.fr:in2p3-00025064 Contributeur : Dominique Girod <> Soumis le : Jeudi 17 Novembre 2005, 10:55:46 Dernière modification le : Jeudi 7 Décembre 2006, 11:23:32