Brad Bachu

PhD Candidate, Department of Physics

Princeton University

bbachu ( at ) princeton (dot) edu

Current Research

For General Audience

Generally, I study the interactions and properties of fundamental particles at energy scales attained, for example, at particle colliders (such as the Large Hadron Collider at CERN), or near the Big Bang. Physics in this enviroment requires a combination of quantum mechanics (as the length scales are smaller than the size of a proton) and special relativity (as the particles are moving close to, or at, the speed of light).

For those still interested, the main focus of my work is to compute and explore 'scattering amplitudes'. These are essentially the most basic features of reality that can be calculated. They encode the probability that a set of particles will turn into another set of particles upon colliding. These mathematical objects have very interesting properties that allow us to describe, make predictions, and even constrain the universe we live in.

Graduate Researcher

Princeton University

Advisor: Prof. Nima Arkani-Hamed

On-Shell Massive Scattering Amplitudes

I am using the recently introduced 'spin-spinors' and on-shell techniques to explore the properties of massive relativistic scattering amplitudes. The underlying theme being 'how far can we go, and what can we learn, without resorting to a Lagrangian descripion quantum field theory'. This includes topics such as Higgsing, Supersymmetry and Supergravity.

Undegraduate Researcher

Massachusetts Institute of Technology

Advisor: Prof. Iain Stewart

Short Distance Top Quark Mass

The top quark is the heaviest known fundamendal particle. The current status of its measured mass places systematic uncertainties higher than its statistical uncertainties. Using a combination of 'effective field theories', we show how certain measurement techniques at e+e- colliders can reduce the systematic uncertainties.

Undegraduate Researcher

Massachusetts Institute of Technology

Advisor: Prof. Christoph Paus

Search for Dark Matter at the LHC

(Search for dark matter created at the Large Hadron Collider at CERN.)