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Micro-canonical pentaquark production in $e^+e^−$ and pp collisions

Abstract : The existence of pentaquarks became questionable, because the Θ+ peak is observed in some p+p collisions, but not in e+e− annihilations. People think initial baryon number is necessary to produce pentaquarks. In this paper, we estimate and compare the production of Θ+(1540) and Ξ−−(1860) in e+e− and pp collisions at different energies using Fermi statistical model as originally proposed in its microcanonical form. We find that both Θ+(1540) and Ξ−−(1860) yield more in e+e− at LEP energies than in pp collisions at SPS and RHIC energies, if pentaquarks do exist. Initial baryon number is not necessary for pentaquark production.
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http://hal.in2p3.fr/in2p3-00272477
Contributor : Dominique Girod <>
Submitted on : Friday, April 11, 2008 - 3:23:35 PM
Last modification on : Friday, January 3, 2020 - 4:30:07 PM

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F.-M. Liu, Klaus Werner. Micro-canonical pentaquark production in $e^+e^−$ and pp collisions. XIV International Symposium on Very High Energy Cosmic Ray Interactions, Aug 2006, Weihai, China. pp.58-61, ⟨10.1016/j.nuclphysbps.2007.10.009⟩. ⟨in2p3-00272477⟩

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