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arXiv 0709.0369hep-ph
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π电荷形状因子中的海夸克效应

Sea-quark effects in the pion charge form factor

Q. B. Li, D. O. Riska

摘要:

它表明,数据上的π电荷形状因子承认的可能性,大量的海夸克成分的π波函数。如果电荷形状因子是用组分夸克模型中的瞬时形式运动学计算的,该模型被扩展为包括π介子波函数中的显式$(q\bar q)^2$分量,则该分量将在大的动量传递值下对计算的$π^+$电荷形状因子做出主要贡献。本实验值$Q^2$可以用高达50%的$(q\bar q)^2$组分混合物很好地描述。计算出的$π^+$电荷形状因子对夸克之一或反夸克之一是否处于P态的敏感性很小。

英文摘要:

It is shown that the data on the pion charge form factor admit the possibility for a substantial sea-quark components in the pion wave function. If the charge form factor is calculated with instant form kinematics in a constituent quark model that is extended to include explicit $(q\bar q)^2$ components in the pion wave function, that component will give the dominant contribution to the calculated $π^+$ charge form factor at large values of momentum transfer. The present experimental values $Q^2$ can be described well with $(q\bar q)^2$ component admixtures of up to 50%. The sensitivity of the calculated $π^+$ charge form factor to whether one of the quarks or one of the antiquarks is taken to be in the P-state is small.

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