摘要
一个新的强子态的实验证据在 2 7.6GeV正电子轰击氘靶产生的虚光子产物中被发现 .HERMES通过分析衰变道K0sp→π+π- p ,在K0sp不变质量谱上质量 15 2 8± 2 .6 (stat .)± 2 .1(sys .)MeV处观察到共振峰 .该共振峰可以被解释为理论预言的五夸克强子态Θ+(uudd s) .而K+p不变质量谱上未能观察到共振预示Θ+很可能是同位旋单态 .
Evidence for a narrow baryon state is found in quasi-real photo-production on a deuterium target through the decay channel K0_sp→π+π-p. A peak is found in K0_sp 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.
出处
《高能物理与核物理》
CSCD
北大核心
2004年第12期1332-1335,共4页
High Energy Physics and Nuclear Physics
