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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Vector meson dominance ： ウィキペディア英語版 Vector meson dominance In physics, vector meson dominance (VMD) was a model developed by J. J. Sakurai〔Theory of strong interactions, J. J. Sakurai, Ann. Phys., 11 (1960)〕 in the 1960s before the introduction of quantum chromodynamics to describe interactions between energetic photons and hadronic matter. In particular the hadronic components of the physical photon consist of the lightest vector mesons $\backslash rho,\; \backslash omega$ and $\backslash phi$. Therefore, interactions between photons and hadronic matter occur by the exchange of a hadron between the dressed photon and the hadronic target. ==Background== Measurements of the interaction between energetic photons and hadrons show that the interaction is much more intense than expected by the interaction of merely photons with the hadron's electric charge. Furthermore, the interaction of energetic photons with protons is similar to the interaction of photons with neutrons〔Bauer, T. H., Spital, R. D., Yennie, D. R. and Pipkin, F. M, The hadronic properties of the photon in high-energy interactions, Rev. Mod. Phys. 50, 261–436 (1978), pages 292-293〕 in spite of the fact that the electric charge structures of protons and neutrons are substantially different. According to VMD, the photon is a superposition of the pure electromagnetic photon (which interacts only with electric charges) and vector meson. Just after 1970, when more accurate data on the above processes became available, some discrepancies with the VMD predictions appeared and new extensions of the model were published.〔Generalized vector dominance and inelastic electron nucleon scattering—the small $\backslash omega$′ region, Sakurai J. J. and Schildknecht D., Phys. Lett., 40B (1972) 121〕 These theories are known as Generalized Vector Meson Dominance theories (GVMD). 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Vector meson dominance」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.