The Search for Exotic Mesons in gamma p -> pi+pi+pi-n with CLAS at Jefferson Lab

The $\pi_1(1600)$, a $J^{PC} = 1^{-+}$ exotic meson has been observed by experiments using pion beams. Theorists predict that photon beams could produce gluonic hybrid mesons, of which the $\pi_1(1600)$ is a candidate, at enhanced levels relative to pion beams. The g12 rungroup at Jefferson Lab's CEBAF Large Acceptance Spectrometer (CLAS) has recently acquired a large photoproduction dataset, using a liquid hydrogen target and tagged photons from a 5.71 GeV electron beam. A partial-wave analysis of 502K $\gamma p \to \pi^+\pi^+\pi^-n$ events selected from the g12 dataset has been performed, and preliminary fit results show strong evidence for well-known states such as the $a_1(1260)$, $a_2(1320)$, and $\pi_2(1670)$. However, we observe no evidence for the production of the $\pi_1(1600)$ in either the partial-wave intensities or the relative complex phase between the $1^{-+}$ and the $2^{-+}$ (corresponding to the $\pi_2$) partial waves.Comment: Proceedings from the XIV International Conference on Hadron Spectroscopy (HADRON2011) 5 pages, 3 figure

Managing Burial Mounds: A Comparative Study of Cultural Heritage Management in China and the United States

本文研究的主题是美国对墓葬遗址的管理方式和相关立法，并对中、美两国在相关法律和保护问题的异同进行比较。中美考古学界对各自国家内土墩类遗存的研究较多，但对比的研究并不多见，而关于相关法律和管理方式的对比研究更是缺乏。现在中、美两国越来越多的考古学者迫切希望在考古领域能进行合作研究，因此非常需要加强对彼此的了解。本课题着重通过选取美国的一个代表性土墩墓考古遗址的管理和保护为主要研究案例，并与中、美两国的其他土墩类遗存进行对比研究。通过探究中、美两国之间在遗产立法和管理保护问题上异同，本文希望能为两国决策者完善或创建更为详尽的关于墓葬遗址的管理和法律法规提供参考。 本课题选取美国卡霍基亚土墩墓群（...The main subject of this study is how burial mounds are managed and preserved in America and how that may be compared to burial mound management in China. An increasing number of archaeologists and museum professionals from both countries have been collaborating with each other on various projects, making it necessary for them to understand both country’s heritage management laws. However, there ...学位：历史学博士院系专业：人文学院_考古学学号：1032012015408

Understanding life-satisfaction changes in post-apartheid South Africa

We analyze the large changes in the level and distribution of reported life satisfaction In South Africa from 1993 to 1998, a period spanning the end of apartheid and the creation of a more inclusive democracy. The percentage of black South Africans reporting dissatisfaction with their lives dropped by over two-thirds, despite only modest improvements in material living conditions. Using household surveys five years apart, we show that the vast majority (over 85 percent) of the improved life satisfaction is attributable to changes in the satisfaction derived from specific living conditions, not to changes in the actual level of those living conditions. While some of these shifts are likely attributed to the social churn at the end of apartheid, these changes also indicate changing opportunities for black South Africans. These results are consistent with hedonic adaptation and show that the factors that make people happier can change dramatically over a relatively short time period.Adaptation; Happiness; Oaxaca decomposition; South Africa; Well-Being