本文選題：相對(duì)論重離子碰撞 + 夸克膠子等離子體��； 參考：《清華大學(xué)》2016年博士論文

【摘要】：本文研究了相對(duì)論重離子碰撞中,由三個(gè)粲味夸克組成的重子?++ccc以及兩個(gè)粲味夸克與一個(gè)輕夸克組成的重子Ξ+cc的產(chǎn)生。首先,我們?cè)趧?shì)模型的框架下,研究了三夸克束縛態(tài)的運(yùn)動(dòng)方程,通過超球坐標(biāo)的方法將三維空間的三體運(yùn)動(dòng)方程轉(zhuǎn)換為九維空間的單體運(yùn)動(dòng)方程,求解了?++ccc的波函數(shù)、質(zhì)量、熔解溫度等基本特征;針對(duì)含有輕夸克組份的Ξ+cc,我們將其波函數(shù)按照超球諧函數(shù)展開,并對(duì)其質(zhì)量和波函數(shù)進(jìn)行了相對(duì)論修正。其次,基于求解三體演化方程得到的多粲夸克重子基態(tài)波函數(shù),我們計(jì)算了相應(yīng)的Wigner函數(shù)并將其參數(shù)化。再利用夸克并合模型計(jì)算了?++ccc和Ξ+cc的產(chǎn)額與動(dòng)量分布。在研究手段上,我們求解三夸克束縛態(tài)運(yùn)動(dòng)方程得到重子波函數(shù)作為Wigner函數(shù)的輸入,這與傳統(tǒng)的的夸克并合模型相比更加自然適用性也更廣。我們發(fā)現(xiàn),LHC中碰撞能量√sN N=2.76 T eV時(shí),Pb+Pb碰撞中一次有效p+p碰撞?++ccc和Ξ+cc的產(chǎn)生截面就比相同能量下p+p碰撞截面分別至少高兩個(gè)和一個(gè)數(shù)量級(jí),這意味著在LHC的核碰撞中極有可能發(fā)現(xiàn)?++ccc和Ξ+cc,是夸克模型正確性的一個(gè)重要證明。如果在實(shí)驗(yàn)上被觀測(cè)到,?++ccc和Ξ+cc不僅是夸克模型所預(yù)言的粲味重子家族的新成員,也將是一種新的干凈且獨(dú)特的夸克膠子等離子形成的信號(hào)探針粒子。
[Abstract]:In the relativistic heavy ion collisions, the production of baryon-ccc, which consists of three charmed quarks and two charmed quarks and one light quark-cc, is studied. Firstly, in the framework of potential model, we study the equations of motion of three-quark bound states. By using the method of hyperspherical coordinates, we transform the three-body motion equations in three-dimensional space into the single motion equations in nine-dimensional space, and solve the wave function of? ccc. Mass, melting temperature and so on. For the cc-containing light quark component, the wave function is expanded according to the hyperspherical harmonic function, and its mass and wave function are modified by relativistic method. Secondly, based on the ground state wave function of the multi-charm quark baryon obtained by solving the three-body evolution equation, we calculate the corresponding Wigner function and parameterize it. The yield and momentum distributions of? ccc and-cc are calculated by using the quark combination model. On the other hand, we obtain baryon wave function as the input of Wigner function by solving the three-quark bound state equation of motion, which is more natural and applicable than the traditional quark combination model. We find that the generation cross sections of ccc and cc are at least two and one orders of magnitude higher than those of p-p collision at the same energy, respectively, when the collision energy in the LHC is 2. 76 T EV, and the effective p p collision in the Pb Pb collision is at least two and one orders of magnitude higher than that of the p p collision cross section at the same energy. This means that it is very likely to be discovered in LHC nuclear collisions? ccc and cc-which are an important proof of the correctness of quark model. If it is observed experimentally that ccc and cc are not only new members of the charm baryon family predicted by the quark model, but also a new and unique signal probe particle formed by quark gluon plasma.
【學(xué)位授予單位】：清華大學(xué)
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2016
【分類號(hào)】：O571.6;O572.2

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