{"title":"Coherent Electroproduction of Vector Mesons on Spinless Targets","authors":"S. I. Manaenkov","doi":"10.1134/s1547477124010096","DOIUrl":null,"url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>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 <span>\\(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}}}}\\)</span> in terms of the SDMEs is obtained for spinless targets and the new approximate formula for <span>\\(R\\)</span> is proposed for nucleon targets.</p>","PeriodicalId":730,"journal":{"name":"Physics of Particles and Nuclei Letters","volume":null,"pages":null},"PeriodicalIF":0.4000,"publicationDate":"2024-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Physics of Particles and Nuclei Letters","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1134/s1547477124010096","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"PHYSICS, PARTICLES & FIELDS","Score":null,"Total":0}
引用次数: 0
Abstract
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.
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.