arXiv 1007.43132010-07-25hep-ph

弦模型中重子和反重子的平均形成长度

Average formation lengths of baryons and antibaryons in string model

L. Grigoryan

备注：: 7 pages, 6 figures
发表信息：: Phys.Rev.C83:014904,2011
DOI：: 10.1103/PhysRevC.83.014904

摘要：

本文继续在弦模型的框架下研究强子化过程的时空尺度。研究了几种广泛应用的重子（反重子）如$p$（$\bar{p}$）、$n$（$\bar{n}$）、$Δ$（$\barΔ$）、$Λ$（$\barΛ$）和$Σ$（$\barΣ$）的平均形成长度.它表明，它们取决于电荷，或更准确地说，从强子的夸克内容。特别是，带正电的强子（例如质子）的平均形成长度要比它们带负电的反粒子（反质子）的平均形成长度大得多。对于所有核目标和Bjorken标度变量$x_{Bj}$的任何值，都满足该语句。主要机制是直接生产。由于共振衰减而产生的附加产生机制的贡献很小。结果表明，质子（反质子）的平均生成长度是$x_{Bj}$的缓升（减）函数，中子和反中子的平均生成长度是$x_{Bj}$的缓减函数.重子的平均形成长度的形状和行为定性地与先前得到的赝标介子的一致。

英文摘要：

In this work it is continued the investigation of the space-time scales of the hadronization process in the framework of string model. The average formation lengths of several widely using species of baryons (antibaryons) such as $p$ ($\bar{p}$), $n$ ($\bar{n}$), $Δ$ ($\barΔ$), $Λ$ ($\barΛ$) and $Σ$ ($\barΣ$) are studied. It is shown that they depend from electrical charges or, more precise, from quark contents of the hadrons. In particular, the average formation lengths of positively charged hadrons, for example protons, are considerably larger than of their negatively charged antiparticles, antiprotons. This statement is fulfilled for all nuclear targets and any value of the Bjorken scaling variable $x_{Bj}$. The main mechanism is direct production. Additional production mechanism in result of decay of resonances gives small contribution. It is shown that the average formation lengths of protons (antiprotons) are slowly rising (decreasing) functions of $x_{Bj}$, the ones of neutrons and antineutrons are slowly decreasing functions of $x_{Bj}$. The shape and behavior of average formation lengths for baryons qualitatively coincide with the ones for pseudoscalar mesons obtained earlier.

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