Photoproduction of Vector Mesons

98746553 col这个为期五年的教师早期职业发展（Career）计划奖的研究部分将深入了解核子中夸克自由度的潜在对称性，入射光子和目标核子之间奇偶交换的本质，并将触及核子的奇异性内容，以及其他逃避ozi的过程。首席研究员（PI）将与他的合作者一起，利用来自杰斐逊实验室B厅CEBAF大接受度光谱仪（CLAS）和欧洲同步辐射设施GRAAL探测器的线性偏振光子束来测量矢量介子的光产生。PI是三个已获批准的实验E94-109、E98-109和E99-013的共同发言人，这些实验将在杰斐逊实验室的B厅进行。有了高质量的线偏振光子束，以及这两个设施的4-pi探测器，我们将把世界上的数据增加大约三个数量级。这一丰富的数据池将使我们能够以一种与模型无关的方式提取自旋密度矩阵元素，从而以前所未有的高精度精确地测量自旋0介子的角分布的演变，这些角分布是由母体矢量介子的衰减引起的，作为cm能量和极性和方位角散射角的函数。在他的母校，为了提高学生对物理和化学的认识，为了提高入学学生的留级率，一直积极致力于将科学部分发展为以代数为基础的工科预科科学课程。PI在他的系内以物理学生协会（SPS）的指导老师的身份推广物理。在埃尔帕索社区更广泛的背景下，他通过将SPS和物理马戏团相结合来促进物理学；PI和几名本科生为UTEP和地区学校的观众进行了一系列令人兴奋和互动的物理演示。埃尔帕索是通往拉丁美洲的门户，德克萨斯大学埃尔帕索分校的本科生占66%，建立一个高水平的实验核物理研究项目将为西班牙裔学生提供独特的研究机会，他们传统上在物理学方面的代表性不足。这项CAREER拨款是德克萨斯大学埃尔帕索分校建立和实施高水平中能核物理项目的关键一步。此外，这个研究项目将提供一个有意义的和最先进的本科生和硕士生的研究经验，以保持国家科学基金会卓越模范机构议程的使命。

9874653ColeThe research component of this five-year Faculty Early Career Development (CAREER) Program Award will yield insights into the underlying symmetry of the quark degrees of freedom in the nucleon, the nature of the parity exchange between the incident photon and target nucleon, and will touch upon the strangeness content of the nucleon, as well as other OZI-evading processes. With his collaborators, the Principal Investigator (PI) will measure the photoproduction of vector mesons by using a beam of linearly-polarized photons from both the CEBAF Large Acceptance Spectrometer (CLAS) in Hall B of Jefferson Lab and the GRAAL detector at the European Synchrotron Radiation Facility. The PI is a cospokesperson on three approved experiments, E94-109, E98-109, and E99-013, which will take place in Hall B of Jefferson Lab. With the high-quality beam of linearly-polarized photons provided, and the 4-pi detectors at these two facilities, we shall increase the world's data by a factor of approximately three orders of magnitude. This rich pool of data will allow us to accurately measure the evolution of the angular distributions of the daughter spin-0 mesons resulting from the decay of the parent vector mesons as functions of c.m. energy, and polar and azimuthal scattering angles with unprecented high precision by extracting the spin density matrix elements in a model-independent way. At his home institution, the PI has been actively engaged in developing the science component to an algebra-based pre-engineering science course in the effort to elevate awareness of physics and chemistry with the objective of increasing the retention rate of entering students. The PI is promoting physics within his department in the capacity of the faculty advisor to the Society of Physics Students (SPS). Within the wider context of the El Paso community, he is promoting physics by combining the SPS and the Physics Circus; the PI and several undergraduate students carry out a set of exciting and interactive physics demonstrations for audiences at UTEP and at area schools. In that El Paso is the gateway to Latin America, and that the student population of the primarily undergraduate University of Texas at El Paso is 66% Hispanic, establishing a high-caliber research program in experimental nuclear physics will provide unique research opportunities for Hispanic students, who traditionally have been underrepresented in physics. The funding for this CAREER grant is a crucial step towards establishing and carrying out a high-caliber medium-energy nuclear physics program at the University of Texas at El Paso. Furthermore, this research program will provide a meaningful and state-of-the-art undergraduate and master's student research experience in keeping with the mission of the NSF Model Institutions for Excellence agenda.