本文關(guān)鍵詞： 夸克對(duì)產(chǎn)生模型 色屏蔽效應(yīng) 輕介子 強(qiáng)衰變 能譜 Regge軌跡　出處：《蘭州大學(xué)》2016年博士論文　論文類(lèi)型：學(xué)位論文

【摘要】：在過(guò)去的幾十年中,隨著實(shí)驗(yàn)技術(shù)的發(fā)展,實(shí)驗(yàn)上發(fā)現(xiàn)了越來(lái)越多的輕介子。此時(shí),迫切需要一個(gè)對(duì)輕介子家族的系統(tǒng)研究。如何把這些粒子在輕介子的框架下進(jìn)行歸類(lèi)成為一個(gè)非常重要的課題。而對(duì)輕介子的質(zhì)量譜及Okubo-Zweig-Iizuka (OZI)規(guī)則允許的兩體強(qiáng)衰變行為的系統(tǒng)研究是其中的一個(gè)十分有效的方案。本博士論文首次系統(tǒng)研究了同位旋矢量輕介子、同位旋標(biāo)量輕介子及K介子家族的譜學(xué)及強(qiáng)衰變行為。我們借助Regge軌跡分析及夸克對(duì)產(chǎn)生模型(QPC模型),系統(tǒng)研究了同位旋為矢量的張量介子、軸矢介子,贗張量介子及高自旋介子家族的能譜及兩體強(qiáng)衰變行為。通過(guò)與現(xiàn)有的實(shí)驗(yàn)數(shù)據(jù)進(jìn)行對(duì)比,進(jìn)一步檢驗(yàn)了理論結(jié)果,從而構(gòu)建了同位旋為矢量的張量介子、軸矢介子、贗張量介子及高自旋介子家族。另外,我們還預(yù)言了很多徑向及軌道激發(fā)態(tài)的質(zhì)量和強(qiáng)衰變信息,這些理論預(yù)言可作為今后BESⅢ、BelleⅡ和PANDA等實(shí)驗(yàn)上開(kāi)展輕強(qiáng)子實(shí)驗(yàn)研究的重要理論參考。除了對(duì)以上輕介子家族的研究,我們還關(guān)注了K介子家族。由于K介子包含一個(gè)奇異夸克和一個(gè)u/d夸克,因此可以作為一個(gè)“準(zhǔn)”的重輕介子系統(tǒng)來(lái)研究。本論文首次把考慮了色屏蔽效應(yīng)的Godfrey-Isgur相對(duì)論夸克模型用于研究K介子家族的能譜,以此得到已經(jīng)發(fā)現(xiàn)的K介子的結(jié)構(gòu)信息。緊接著,我們考察了K介子的OZI規(guī)則允許的兩體強(qiáng)衰變行為,并將理論研究結(jié)果與相關(guān)的實(shí)驗(yàn)信息進(jìn)行對(duì)比,從而驗(yàn)證了由譜學(xué)研究給出的結(jié)構(gòu)信息。另外,我們還預(yù)言了在實(shí)驗(yàn)上缺失的K介子的的質(zhì)量及兩體強(qiáng)衰變性質(zhì)。因此,本研究成為構(gòu)建K介子家族和進(jìn)一步尋找高激發(fā)態(tài)K介子的關(guān)鍵。本博士論文的研究,結(jié)合本文作者所在研究組之前對(duì)輕介子家族所做的系統(tǒng)研究工作,構(gòu)成了關(guān)于輕介子家族研究的一個(gè)完整系列。因此,通過(guò)本論文對(duì)整個(gè)輕介子家族譜學(xué)的系統(tǒng)研究與回顧,使我們對(duì)輕介子的性質(zhì)有了一個(gè)更清晰而完整的認(rèn)識(shí)。
[Abstract]:In the past few decades, with the development of experimental technology, more and more light mesons have been discovered. There is an urgent need for a systematic study of the light meson family. How to classify these particles within the framework of light mesons has become a very important issue. The mass spectrum of light mesons and Okubo-Zweig. -Iizuka. (. The OZI rule allows the systematic study of the two-body strong decay behavior is one of the most effective schemes. In this dissertation, the isospin vector light mesons are studied systematically for the first time. The spectral and strong decay behaviors of isospin scalar light mesons and K mesons are studied systematically by means of Regge locus analysis and quark-pair production model. The energy spectrum and two-body strong decay behavior of axial vector meson pseudo-#china_person0# meson and high spin meson family are compared with the available experimental data and the theoretical results are further verified. Thus, the families of Zhang Liang mesons, axial vector mesons, pseudo-#china_person1# mesons and high spin mesons with isospin vectors are constructed. In addition, we also predict the mass and strong decay information of radial and orbital excited states. These theoretical predictions can be used as an important theoretical reference for the study of light Hadron in BES 鈪，

本文編號(hào)：1456902