无自旋靶上矢量介子的相干电致发生

IF 0.4 Q4 PHYSICS, PARTICLES & FIELDS

Physics of Particles and Nuclei Letters Pub Date : 2024-03-12 DOI:10.1134/S1547477124010096

S. I. Manaenkov

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引用次数: 0

摘要

摘要研究表明，只有当轻子束纵向偏振时，重光子在无自旋目标上产生矢量介子的振幅比才能用自旋密度矩阵元素（SDMEs）明确表示。利用振幅比作为自由拟合参数而不是自旋密度矩阵元素，可以将数据描述中的实际参数数量从 23 个减少到 8 个。R = {{frac{d{\sigma }_{{text/{L}}}}}}{dt}}}的精确公式是\mathord\{left/ {\vphantom {{frac{{d{\sigma }_{{text\{L}}}}}}{{dt}}}{\frac{{d{{\sigma }_{{\text{T}}}}}}{{dt}}}}}\right.\kern-0em} {\frac{d{\sigma }_{{text{T}}}}}}{dt}}}}\))在SDMEs方面得到了无自旋目标，并为核子目标提出了\(R\)的新近似公式。

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Coherent Electroproduction of Vector Mesons on Spinless Targets

It is shown that the amplitude ratios of vector-meson production by heavy photons on spinless targets can be explicitly expressed in terms of the spin-density-matrix elements (SDMEs) only if the lepton beam is longitudinally polarized. Making use of the amplitude ratios as free fit parameters instead of the SDMEs reduces the number of the real parameters in data description from 23 to 8. The exact formula for \(R = {{\frac{{d{{\sigma }_{{\text{L}}}}}}{{dt}}} \mathord{\left/ {\vphantom {{\frac{{d{{\sigma }_{{\text{L}}}}}}{{dt}}} {\frac{{d{{\sigma }_{{\text{T}}}}}}{{dt}}}}} \right. \kern-0em} {\frac{{d{{\sigma }_{{\text{T}}}}}}{{dt}}}}\) in terms of the SDMEs is obtained for spinless targets and the new approximate formula for \(R\) is proposed for nucleon targets.

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来源期刊

Physics of Particles and Nuclei Letters PHYSICS, PARTICLES & FIELDS-

CiteScore

0.80

自引率

20.00%

发文量

108

期刊介绍： The journal Physics of Particles and Nuclei Letters, brief name Particles and Nuclei Letters, publishes the articles with results of the original theoretical, experimental, scientific-technical, methodological and applied research. Subject matter of articles covers: theoretical physics, elementary particle physics, relativistic nuclear physics, nuclear physics and related problems in other branches of physics, neutron physics, condensed matter physics, physics and engineering at low temperatures, physics and engineering of accelerators, physical experimental instruments and methods, physical computation experiments, applied research in these branches of physics and radiology, ecology and nuclear medicine.