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: NΞ(1862)−−⋅BR(Ξ(1862)−−→Ξ−π−)<4.5×10−4, NΞ0(1862)⋅BR(Ξ0(1862)→Ξ−π+)<8.9×10−4, NΘc0(3100)⋅BR(Θc0(3100)→D*−p)<6.3×10−4, NΘc0(3100)⋅BR(Θc0(3100)→D−p)<31×10−4.
Search for pentaquark states in Z decays.
MESSINEO, ALBERTO MARIA;
2004-01-01
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: NΞ(1862)−−⋅BR(Ξ(1862)−−→Ξ−π−)<4.5×10−4, NΞ0(1862)⋅BR(Ξ0(1862)→Ξ−π+)<8.9×10−4, NΘc0(3100)⋅BR(Θc0(3100)→D*−p)<6.3×10−4, NΘc0(3100)⋅BR(Θc0(3100)→D−p)<31×10−4.File in questo prodotto:
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