U.S.-Switzerland Research: A Study of the Heavy Quark Content of b-Jets

美国-瑞士研究：b-喷流的重夸克含量研究

• 批准号: 0840037
• 负责人: Sally Seidel
• 金额: $ 1.49万
• 依托单位: University of New Mexico
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2008
• 资助国家: 美国
• 起止时间: 2008-12-01 至 2011-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0840037&HistoricalAwards=false
• 关键词: U.S.; Switzerland; Research; Study; Heavy

This dissertation research will investigate the heavy quark content of b-quark jets produced in the ATLAS detector at CERN. The research will be conducted in collaboration with CERN Laboratory under the auspices of Dr. Maria Smizanska. This study will probe the fragmentation properties of b-jets with reconstructed charmed hadrons in their most efficiently detected decay modes. The analysis will use data streams sensitive to events containing muon + jet and Z + jet which will be captured by unbiased ATLAS triggers based on muon + jet and dimuon patterns in the ATLAS subdetectors. This will be the first test of the fragmentation models encoded in Monte Carlo generators against data at the energy frontier of the Large Hadron Collider. It will allow ATLAS to calibrate its energy scale. The reconstructed charm particle decays can be useful in disentangling the contribution of g-b anti-b splitting processes from single-b contributions. The correct fragmentation model is essential to the description of b-jet spectra and is consequently crucial for a proper subtraction of backgrounds to searches for new physics including the Higgs. This proposal will support the international dissertation research for one graduate student.

本论文的研究内容是在CERN的ATLAS探测器上产生的b夸克喷注的重夸克含量。 这项研究将在Maria Smizanska博士的主持下与CERN实验室合作进行。 本研究将探讨b喷注与重建粲强子在其最有效的检测衰变模式的碎裂特性。分析将使用对包含μ子+喷流和Z +喷流的事件敏感的数据流，这些事件将由基于ATLAS子探测器中的μ子+喷流和双μ子模式的无偏ATLAS触发器捕获。这将是对蒙特卡罗发生器中编码的碎裂模型与大型强子对撞机能量前沿数据的首次测试。它将允许ATLAS校准其能量标度。重建的魅粒子衰变可以用于从单b贡献中分离出g-b反b分裂过程的贡献。正确的碎裂模型是必不可少的b喷流光谱的描述，因此是至关重要的一个适当的扣除的背景，以寻找新的物理，包括希格斯粒子。该提案将支持一名研究生的国际论文研究。