Phenomenological aspects of new physics at high energy hadron colliders
Andreas Papaefstathiou
备注：
PhD Thesis submitted to the University of Cambridge in April 2011, examined in May 2011 and approved in July 2011. 225 pages. Abstract shortened in arXiv submission
A general introduction is given in chapter 1. Chapter 2 outlines the main features of the Standard Model (SM) of particle physics and the theoretical motivations for going beyond it. We subsequently provide brief descriptions of a few popular models that aim to solve the issues that arise within the SM. In chapter 3 we describe the general Monte Carlo method and show how it can be used to construct a class of computational tools called Monte Carlo event generators. We describe the main generic features of event generators and how these are implemented in the HERWIG++ event generator. By applying resummation techniques, we provide, in chapter 4, analytical calculations of two types of hadron collider observables: global inclusive variables and the transverse energy of the QCD initial state radiation (ET), associated with the either Drell-Yan gauge boson production or Higgs boson production. In both cases we provide comparisons to results obtained from Monte Carlo event generators. In chapter 5 we examine two well-motivated models for new physics: one of new heavy charged vector bosons (W prime) and a model motivated by strong dynamics electroweak symmetry breaking that contains new resonances, leptoquarks, that couple primarily to quarks and leptons of the third generation. In the prior model, we improve the current treatment of the W' by considering interference effects with the SM W and construct an event generator accurate to next-to-leading order which we use to conduct a phenomenological analysis. For the leptoquark model, we provide an implementation in the HERWIG++ event generator and use it to form a strategy for mass reconstruction.
Addendum/Erratum for `Searching for Invisible and Almost Invisible Particles at $\bf e^+e^-$ Colliders' [hep-ph/9512230] and `A Non-Standard String/SUSY Scenario and its Phenomenological Implications' [hep-ph/9607421]
Flavor-changing decay $h\to τμ$ at super hadron colliders
我们研究了在未来强子对撞机上Higgs玻色子的味道变化衰变$h\to τμ$与$τ=τ^-+τ^+$和$μ=μ^-+μ^+$的关系，即：a）高亮度大型强子对撞机，b）高能大型强子对撞机和c）未来强子-强子圆形对撞机.采用的理论框架是双希格斯双重模型III型。通过Higgs玻色子数据、轻子味破坏过程和μ子反常磁偶极矩约束自由模型参数，计算了$h\toτμ$衰变的分支比和$gg\to h$产生截面.我们发现，在大型强子对撞机是不可能声称的证据的衰变$h\toτμ$实现信号的意义约$1.46σ$考虑其最终的综合光度，300 fb $^{-1}$。更有希望的结果出现在高亮度大型强子对撞机，其中预测的4.6 $σ$时，3 ab $^{-1}$和$\tanβ=8$的综合光度实现。与此同时，在高能大型强子对撞机（未来强子-强子圆形对撞机），一个潜在的发现可能被声称具有信号意义的$5.04σ$（$5.43σ$）周围的综合光度为3 ab $^{-1}$和$\tanβ=8$（5 ab $^{-1}$和$\tanβ=4$）。
Phenomenological Parametrization of the Charged Particle Multiplicity Distributions in Restricted Rapidity Intervals in e+e- Annihilation into Hadrons and e+p Scattering at HERA
