Particle Physics at the LHC Start

TL;DR

This paper reviews the challenges and key issues in particle physics at the start of the LHC era, focusing on the Standard Model, electroweak symmetry breaking, and potential new physics discoveries.

Contribution

It provides a concise overview of the Standard Model, the Higgs sector, and discusses possible new physics that the LHC might reveal, highlighting the uncertainties in current theories.

Findings

The Higgs sector remains unverified and possibly more complex.

The LHC could uncover new physics beyond the Standard Model.

Electroweak symmetry breaking is central to current particle physics research.

Abstract

I present a concise review of the major issues and challenges in particle physics at the start of the LHC era. After a brief overview of the Standard Model and of QCD, I will focus on the electroweak symmetry breaking problem which plays a central role in particle physics today. The Higgs sector of the minimal Standard Model is so far just a mere conjecture that needs to be verified or discarded by the LHC. Probably the reality is more complicated. I will summarize the motivation for new physics that should accompany or even replace the Higgs discovery and a number of its possible forms that could be revealed by the LHC.