A. Henrichs

SUSY Simplified Models at 14, 33, and 100 TeV Proton Colliders

A bstractResults are presented for a variety of SUSY Simplified Models at the 14 TeV LHC as well as a 33 and 100 TeV proton collider. Our focus is on models whose signals are driven by colored production. We present projections of the upper limit and discovery reach in the gluino-neutralino (for both light and heavy flavor decays), squark-neutralino, and gluino-squark Simplified Model planes. Depending on the model a jets +

Measurement of \sigma _{t\bar{t}}\;\text {in}\; 0.7\; \text {fb}^{-1} of Data

E_T^{\mathrm{miss}}

General Analysis Strategy

, mono-jet, or same-sign di-lepton search is applied. The impact of pileup is explored. This study utilizes the Snowmass backgrounds and combined detector. Assuming 3000 fb−1 of integrated luminosity, a gluino that decays to light flavor quarks can be discovered below 2.3 TeV at the 14 TeV LHC and below 11 TeV at a 100 TeV machine.

Objects and Processes

With 0.7 \(\text {fb}^{-1}\) of data provided by the LHC and taken by the ATLAS experiment in the first half of 2011, another measurement of the top quark pair production cross section in the lepton+jets channel is conducted. While the general analysis strategy is the same as for the analysis described in Chap. 5 and is based on the ideas outlined in Chap. 6, the details of the analyses presented here and in Chap. 6 differ.

The Top Quark in the Context of the Standard Model

To measure the top quark pair production cross section in the \(\ell \)+jets channel, the key feature is to distinguish between top quark pair production and the dominant background processes, \(W\)+jets production and QCD multijet production. This can be achieved by imposing harsh cuts on the event selection leading to a signal enriched sample with small backgrounds. In such a case, a simple counting experiment can be used to extract the cross section and is typically done for measurements with low statistics. However, once the statistics of the available data set grows, the limiting factor will be the systematic uncertainty.

Future Extension to a Simultaneous Measurement of \sigma _{t\bar{t}} and R_b

Through the remainder of this work, the focus will be on measurements in the lepton+jets channel of top quark pair production. This chapter will describe how the involved physics objects are reconstructed and identified, and how signal and background processes are modeled and estimated.

Measurement of {\sigma _{t\bar{t}}} in 35 \text {pb}^{-1} of Data

The analyses presented in this thesis deal with measurements of the production of top quark pairs at the Large Hadron Collider, as predicted in the framework of the Standard Model of Particle Physics. The first part of this chapter will focus on the theoretical framework in general, while the second part will describe the production and properties of top quarks in more detail and give an overview of the current experimental knowledge of top quark production.

A Comparison of Future Proton Colliders Using SUSY Simplified Models: A Snowmass Whitepaper

After the measurement technique presented here is established in single measurements as presented in Chaps. 6 and 7, it can be extended to simultaneous measurements of \(\sigma _{t\bar{t}}\) and other quantities the selection of events is sensitive to.