Detailed balance and sea-quark flavor asymmetry of proton

In this study, the proton is taken as an ensemble of quark–gluon Fock states. Using the principle of detailed balance, the probabilities of finding every Fock states of the proton are obtained without any parameter. A new origin of the light flavor sea quark asymmetry, i.e., ū≠d̄, is given as a pure statistical effect. It is found that d̄−ū≈0.124, which is in surprisingly agreement with the experimental observation.