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Heat medium properties of heavy quarkonium

Author: ZhongYang
Tutor: ChenJianXing
School: Liaoning Normal University
Course: Particle Physics and Nuclear Physics
Keywords: Quark-gluon plasma Schr?dinger equation Heavy quarkonium Decay width
CLC: O572.33
Type: Master's thesis
Year: 2011
Downloads: 3
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Abstract


The quark-gluon plasma is an important state of matter, it is closely related to the early evolution of the universe. High temperature quantum chromodynamics (QCD) there are some typical features of the J / ψ sand depression, quark deconfinement, chiral symmetry restoration. The research on the nature of the quark-gluon plasma is an important research direction of particle physics, is very important for a better understanding of quantum chromodynamics (QCD), the basic questions reveal the evolution of the universe. Since the seventies of the last century, people from both theoretical and experimental aspects under extreme conditions such as high-temperature high-density and material properties. Hadronic degrees of freedom from the hadron phase to the quark-gluon plasma phase whether the phase transition occurs, if the phase transition occurs, what is its nature. At present, the basic theory of finite temperature field theory to study the quark-gluon plasma. At low temperatures, the quark-gluon plasma to weak the π mesons gas interactions appear at very high temperatures and weak interaction between the quark-gluon perturbation theory, in theory, can better processing. However, near the critical point of phase transition region, the system is in the hadron - quark - gluon state of coexistence, perturbation theory fails, this area of ??theoretical research in the simulation of grid points and various calculated based on lattice points phenomenological model based. Heavy quarkonium is an important frontier of high energy physics, and the history of the establishment of quantum chromodynamics (QCD) played an important role as a correct description of the basic theory of the strong interaction. Different temperature impact on the the heavy quarkonium quality spectrum as well as the decay is an important method to study the nature of the quark-gluon plasma. Especially in the critical temperature is the nature of widespread concern. This paper will discuss the quality of the quark-gluon plasma in heavy quarkonium spectrum and decay widths. In the case of zero temperature, due to the presence of the confinement potential, quark bound in the potential well in confinement. When the temperature rises, the shielding effect of the quark-gluon plasma, a large distance interactions between quarks diminishing, resulting in disappearance of confinement - deconfinement phenomenon. Quarkonium decomposition into a free state, no longer appear in the form of bound states. The different temperatures charmonium and bottom positronium use different phenomenological potential study. Schr?dinger equation calculated to charm the quarkonium and bottom quarkonium mass spectrum in limited temperature, the root mean square radius and decay width. Calculated as the temperature increases, the quality of quarkonium declining until decomposition. The Charmonium s Porgy state in T ~ 1.22Tc, will decompose; rather the T until 1.98Tc still in bondage. Also studied s the wave state n3S1 → e e-and decay processes n3S1 → 3g and P-wave state n3P2 → rr and n3p2 → gg decay process. Quarkonium decay width is proportional to (?) And (?) By analyzing the decay width decreases as the temperature rises, this conclusion. With these data, we can see that the bottom quarkonium than charm quarkonium more stable. And analysis of different radial excitation states and different orbit excited state, the the the heavy quarkonium high radial excited state, high orbit excited state first melting. Near the critical temperature, the root mean square radius of the heavy quarkonium significant increase zero wave function and derivative significantly reduced but the quality is not large relative changes.

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CLC: > Mathematical sciences and chemical > Physics > Nuclear physics,high energy physics > High-energy physics > Particle types > Meson
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