Studying highly boosted Higgs bosons in the bb decay mode

本论文的目的是研究在LHC上ATLAS实验测量的400 GeV/c以上的Higgs玻色子的横动量谱。在这一运动学区域，粒子的产生对新的、未被发现的粒子的影响特别敏感，这些粒子可能会改变粒子的速率。这一发现将为自然性问题提供线索--为什么希格斯粒子的质量与普朗克尺度如此不同。要识别这种增强的希格斯玻色子，需要对ATLAS使用的b标记技术进行重大改革。这些假设是B夸克在束管内衰变，但在这些动量中，一半或更多的产生B强子，它们在衰变前穿过探测器的一部分。因此，需要作出重大改进。目前ATLAS还没有对这一过程进行过研究，这是一个全新的过程。

The aim of the thesis is to study the transverse momentum spectrum of the Higgs boson as measured by thhe ATLAS experiment at the LHC above 400 GeV/c. In this kinematic region production would be particularly sensitive to the impact of new, undiscovered particles which might change the rate, A discovery here would provide clues to the natrualness problem - why the Higgs mass is so different from the Planck scale.The identification of such boosted Higgs bosons will require a significant overhaul of the b-tagging techniques employed by ATLAS. These assume the b quarks decay inside the beam pipe, but at these momenta half or more produce b hadrons which traverse part of the detector before decaying. Thus significant improvements are required. At present ATLAS has made no studies of this process, of this is completely new.