我们计算了核子在低归一化点处的夸克和反夸克横截率分布$<trans\; data-src="(">(</trans>\mathrm{<trans\; data-src="\mu ">\mu </trans>}\mathrm{<trans\; data-src="\approx ">\approx </trans>}\mathrm{<trans\; data-src="600">600</trans>}$MeV）在大范围内-${\mathrm{<trans\; data-src="N">N个</trans>}}_{\mathrm{<trans\; data-src="c">c（c）</trans>}}$极限，其中核子可以描述为有效手征理论的孤子（手征夸克孤子模型）。风味单一分布$\mathrm{<trans\; data-src="\delta ">\delta </trans>}\mathrm{<trans\; data-src="u">单位</trans>}<trans\; data-src="(">(</trans>\mathrm{<trans\; data-src="x">x个</trans>}<trans\; data-src=")">)</trans>\mathrm{}\mathrm{<trans\; data-src="-">-</trans>}\mathrm{<trans\; data-src="\delta ">\delta </trans>}\mathrm{<trans\; data-src="d">d日</trans>}<trans\; data-src="(">(</trans>\mathrm{<trans\; data-src="x">x个</trans>}<trans\; data-src=")">)</trans>\mathrm{}$和$\mathrm{<trans\; data-src="\delta ">\delta </trans>}\mathrm{<trans\; data-src="ū">ū</trans>}\mathrm{}<trans\; data-src="(">(</trans>\mathrm{<trans\; data-src="x">x个</trans>}<trans\; data-src=")">)</trans>\mathrm{}\mathrm{<trans\; data-src="-">-</trans>}\mathrm{<trans\; data-src="\delta ">\delta </trans>}\stackrel{\mathrm{<trans\; data-src="¯">¯</trans>}}{\mathrm{<trans\; data-src="d">d日</trans>}}\mathrm{}<trans\; data-src="(">(</trans>\mathrm{<trans\; data-src="x">x个</trans>}<trans\; data-src=")">)</trans>\mathrm{}$以${\mathrm{<trans\; data-src="1">1</trans>}<trans\; data-src="/">/</trans>\mathrm{<trans\; data-src="N">N个</trans>}}_{\mathrm{<trans\; data-src="c">c（c）</trans>}}$扩展，而风味-单角分布$\mathrm{<trans\; data-src="\delta ">\delta </trans>}\mathrm{<trans\; data-src="u">单位</trans>}<trans\; data-src="(">(</trans>\mathrm{<trans\; data-src="x">x个</trans>}<trans\; data-src=")">)</trans><trans\; data-src="+">+</trans>\mathrm{<trans\; data-src="\delta ">\delta </trans>}\mathrm{<trans\; data-src="d">d日</trans>}<trans\; data-src="(">(</trans>\mathrm{<trans\; data-src="x">x个</trans>}<trans\; data-src=")">)</trans>\mathrm{}$和$\mathrm{<trans\; data-src="\delta ">\delta </trans>}\mathrm{<trans\; data-src="ū">ū</trans>}\mathrm{}<trans\; data-src="(">(</trans>\mathrm{<trans\; data-src="x">x个</trans>}<trans\; data-src=")">)</trans><trans\; data-src="+">+</trans>\mathrm{<trans\; data-src="\delta ">\delta </trans>}\stackrel{\mathrm{<trans\; data-src="¯">¯</trans>}}{\mathrm{<trans\; data-src="d">d日</trans>}}\mathrm{}<trans\; data-src="(">(</trans>\mathrm{<trans\; data-src="x">x个</trans>}<trans\; data-src=")">)</trans>\mathrm{}$仅在相邻的前导顺序中非零。发现横截夸克和反夸克分布与纵向极化分布有显著不同$\mathrm{<trans\; data-src="\Delta ">\Delta </trans>}\mathrm{<trans\; data-src="u">单位</trans>}<trans\; data-src="(">(</trans>\mathrm{<trans\; data-src="x">x个</trans>}<trans\; data-src=")">)</trans>\mathrm{}<trans\; data-src="\pm ">\pm </trans>\mathrm{<trans\; data-src="\Delta ">\Delta </trans>}\mathrm{<trans\; data-src="d">d日</trans>}<trans\; data-src="(">(</trans>\mathrm{<trans\; data-src="x">x个</trans>}<trans\; data-src=")">)</trans>\mathrm{}$和$\mathrm{<trans\; data-src="\Delta ">\Delta </trans>}ū\mathrm{}<trans\; data-src="(">(</trans>\mathrm{<trans\; data-src="x">x个</trans>}<trans\; data-src=")">)</trans>\mathrm{}<trans\; data-src="\pm ">\pm </trans>\mathrm{<trans\; data-src="\Delta ">\Delta </trans>}\stackrel{\mathrm{<trans\; data-src="¯">¯</trans>}}{\mathrm{<trans\; data-src="d">d日</trans>}}\mathrm{}<trans\; data-src="(">(</trans>\mathrm{<trans\; data-src="x">x个</trans>}<trans\; data-src=")">)</trans><trans\; data-src=",">,</trans>$分别与朴素非相对论夸克模型的预测相反。我们表明，这影响了横向极化Drell-Yan对产生中自旋不对称的预测$\mathrm{<trans\; data-src="pp">聚丙烯</trans>}$和$\mathrm{<trans\; data-src="p">第页</trans>}\stackrel{\mathrm{<trans\; data-src="¯">¯</trans>}}{\mathrm{<trans\; data-src="p">第页</trans>}}$碰撞。

• 收到日期：2001年3月20日

内政部：https://doi.org/10.103/PhysRevD.64.034013