Institute of Physics, Academia Sinica, Taipei 11529, Taiwan.
Phys Rev Lett. 2011 Jun 24;106(25):252002. doi: 10.1103/PhysRevLett.106.252002. Epub 2011 Jun 22.
The existence of the five-quark Fock states for the intrinsic charm quark in the nucleons was suggested some time ago, but conclusive evidence is still lacking. We generalize the previous theoretical approach to the light-quark sector and study possible experimental signatures for such five-quark states. In particular, we compare the d-ū and ū + d-s-s data with the calculations based on the five-quark Fock states. The qualitative agreement between the data and the calculations is interpreted as evidence for the existence of the intrinsic light-quark sea in the nucleons. The probabilities for the |uuduū and |uuddd Fock states are also extracted.
一段时间以前，就有人提出了核子中内禀粲夸克的五夸克 Fock 态的存在，但目前仍缺乏确凿的证据。我们将之前的理论方法推广到轻夸克领域，并研究了这种五夸克态可能的实验特征。特别是，我们将 d-ū 和 ū + d-s-s 数据与基于五夸克 Fock 态的计算进行了比较。数据与计算之间的定性一致性被解释为核子中存在内禀轻夸克海的证据。还提取了 |uuduū 和 |uuddd Fock 态的概率。
