Search for pentaquark states in Z decays.

van der Aa, Olivier;Delaere, Christophe;Leibenguth, Guillaume;Lemaitre, Vincent;et.al.
(2004) Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics — Vol. 599, n° 1-2, p. 1-16 (2004)

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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.
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van der Aa, O., Delaere, C., Leibenguth, G., Lemaitre, V., & et al. (2004). Search for pentaquark states in Z decays. Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics, 599(1-2), 1-16. https://doi.org/10.1016/j.physletb.2004.08.021 (Original work published 2004)