论文标题
灯锥模型中的海夸克的作用
Sivers function of sea quarks in the light-cone model
论文作者
论文摘要
我们使用轻单键形式主义中的重叠表示，计算$ \ bar {u} $和$ \ bar {d} $ quarks的Sivers函数。质子的轻锥波函数是根据$ | \ bar {q} q b \ rangle $ fock状态获得的。我们考虑在一个Gluon交换水平上的最终状态相互作用。在简化的场景中，$ \ bar {u} $和$ \ bar {d} $的sivers功能可以表示为质子内部乳头功能的卷积，以及pion内部$ \ bar {q} $的未固定分布。模型参数是通过将未铝的Sea Quark分布拟合到已知参数化来固定的。我们介绍了$ f_1^{\ perp \ bar {u}/p}（x，x，\ boldsymbol {k} _t^2）$和$ f_1^{\ perp \ bar {d}/p}（x，x，x，x，\ boldsymbol {k k} _t^2）$。我们模型中的海夸克·西弗斯（Sea Quark Sivers）功能的第一个横向力矩被认为为负，最多约为0.004。
We calculate the Sivers function of $\bar{u}$ and $\bar{d}$ quarks using the overlap representation within the light-cone formalism. The light-cone wave functions of the proton is obtained in terms of the $|\bar{q} q B\rangle$ Fock states motivated by the meson-baryon fluctuation model. We consider the final-state interaction at the level of one gluon exchange. In a simplified scenario, the Sivers function of $\bar{u}$ and $\bar{d}$ can be expressed as the convolution of the Sivers function of the pion inside the proton and the unpolarized distribution of $\bar{q}$ inside the pion. The model parameters are fixed by fitting the unpolarized sea quark distributions to the known parameterizations. We present the numerical results for $f_1^{\perp \bar{u}/p}(x,\boldsymbol{k}_T^2)$ and $f_1^{\perp \bar{d}/p}(x,\boldsymbol{k}_T^2)$. The first transverse moment of the sea quark Sivers functions in our model are find to be negative and the magnitude is about 0.004 at most.
