Search for the Pentaquark at the HERMES

MAO Ya-Jun

Chinese Physics C> 2004, Vol. 28> Issue(12) : 1332-1335

Search for the Pentaquark at the HERMES

MAO Ya-Jun ^,

Department of Technical Physics,School of Physics,Peking University,Beijing 100871,China

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Evidence for a narrow baryon state is found in quasi–real photo–production on a deuterium target through the decay channel K0sp→π+π–p. A peak is found in K0sp invariant mass spectrum at 1528± 2.6(stat.)±2.1(sys.)MeV,which can be interpreted as the predicted Θ+(uudd)pentaquark baryon state. The absence of peak structure in K+p invariant mass spectrum implies that the state is very likely a isosinglet state.

References

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MAO Ya-Jun. Search for the Pentaquark at the HERMES[J]. Chinese Physics C, 2004, 28(12): 1332-1335.

MAO Ya-Jun. Search for the Pentaquark at the HERMES[J]. Chinese Physics C, 2004, 28(12): 1332-1335. shu

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Received: 2003-11-29
Revised: 1900-01-01

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沈阳化工大学材料科学与工程学院沈阳 110142

Search for the Pentaquark at the HERMES

MAO Ya-Jun ^,

Corresponding author: MAO Ya-Jun,

Department of Technical Physics,School of Physics,Peking University,Beijing 100871,China

Received Date: 2003-11-29
Accepted Date: 1900-01-01
Available Online: 2004-12-05

Abstract: Evidence for a narrow baryon state is found in quasi–real photo–production on a deuterium target through the decay channel K0sp→π+π–p. A peak is found in K0sp invariant mass spectrum at 1528± 2.6(stat.)±2.1(sys.)MeV,which can be interpreted as the predicted Θ+(uudd)pentaquark baryon state. The absence of peak structure in K+p invariant mass spectrum implies that the state is very likely a isosinglet state.