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首页> 外文期刊>Physics of atomic nuclei >Potential of quasielastic meson knockout from a nucleon by high-energy electrons and pions for studying the structure of exotic excited states of a final-state baryon
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Potential of quasielastic meson knockout from a nucleon by high-energy electrons and pions for studying the structure of exotic excited states of a final-state baryon

机译：高能电子和介子从核子中敲除准弹性介子的潜力，用于研究最终态重子的奇异激发态的结构

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摘要

The possibility of studying q(4)(q) over bar exotic baryon states by means of N(e, e'M)B reactions proceeding via an extremely simple mechanism and involving the quasielastic knockout of various mesons from a nucleon by electrons of energy in the few-GeV region is considered as a development of the previous investigations Of Our group. A quark microscopic formalism based on the cluster model of q(4)(q) over bar States, which makes it possible to determine momentum distributions of mesons in various channels of B -> N + M virtual decays (in principle, these distributions can be compared with experimental data), is expounded by considering the example of the pentaquark (B = circle minus(+)). The decay widths of the q(4)(q) over bar baryon states being discussed are governed by the degree of separation of quark Clusters (this is a parameter of the model used). The electroproduction cross sections prove to be small because of kinematical constraints requiring that physically admissible values of the momentum vertical bar k vertical bar of the virtual meson M lie in the region where relevant amplitudes are suppressed substantially by form factors in pentaquark vertices. In particular, N(e, e'pi(+/-))B reactions involving pion knockout furnish direct information about nonstrange components of baryon B; however, the expected cross sections for such reactions are an order of magnitude smaller than their counterparts for analogous reactions leading to the production of a pentaquark circle minus(+). Because of the smallness of the electroproduction cross sections, it is reasonable to consider the production of a pentaquark and other q4 (q) over bar exotic states in reactions characterized by quasielastic kinematics and initiated by pions of energy in the range between about 1 and 5 GeV and in similar stripping and pickup nuclear reactions.
机译：通过N（e，e'M）B反应通过极简单的机理进行N（e，e'M）B反应研究奇异重子态上q（4）（q）的可能性，涉及通过能量电子从核子中介子质子敲除在少数GeV地区被认为是对我们小组先前研究的发展。基于q（4）（q）簇状态上的簇模型的夸克微观形式论，这使得确定B-> N + M虚拟衰变各个通道中介子的动量分布成为可能（原则上，这些分布可以与实验数据进行比较），以五夸克为例进行说明（B =圆减去（+））。 q（4）（q）在重子重子态上的衰减宽度受夸克簇的分离程度控制（这是所用模型的参数）。由于运动学上的约束要求虚拟介子M的动量垂直线k垂直线k垂直线的物理上可接受的值位于五夸克顶点中的形状因数基本上抑制了相关区域的区域，因此电生产横截面证明很小。尤其是，涉及介子敲除的N（e，e'pi（+/-））B反应提供了有关重子B非奇异成分的直接信息。但是，此类反应的预期横截面比类似反应的横截面小一个数量级，从而导致产生五夸克圆减（+）。由于电生产横截面较小，因此有理由考虑在以准弹性运动学为特征并且由介子能量在约1至5之间引发的反应中，在奇异状态下产生五夸克和其他q4（q） GeV和类似的剥离和拾取核反应。

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