## Theoretical Physics Department

Researchers in the Fermilab Theoretical Physics Department advance the field of particle physics.

We are curious!

What makes up the Universe? What is Dark Matter? Why are Neutrinos so light? Do they violate CP? What sets the electroweak scale? Are there forces of nature we do not know of? Are there Sterile Neutrinos? How can we extract the most information from the LHC? What are the properties of the Higgs Boson? What can we learn for flavor and precision tests of the Standard model? Why is there more matter than anti-matter?

Working in concert with the experimental program, we pursue the major physics drivers of the field, including the Higgs boson, neutrinos, dark matter, and new theoretical frameworks. We develop and provide leading theoretical tools based on lattice QCD and perturbative QCD. We provide a uniquely stimulating environment for postdocs and students, and a hub for the U.S. particle theory community.

### Tools

We develop and provide leading theoretical tools based on lattice QCD and perturbative QCD.

### Matter-Antimatter Asymmetry in Neutral Kaons

Sept. 30, 2021, 2:30 pm US/Central
Zachary Polonsky, U. Cincinnati
The parameter $\epsilon_K$ is an important measure of the imbalance between matter and antimatter in the neutral kaon ($K^0$ and $\bar{K}^0$) system. In particular, $\epsilon_K$ provides a sensitive probe of new physics and plays a critical role in the global fit of the Cabibbo-Kobayashi-Maskawa matrix. As one of the first discovered sources of $CP$ violation,... More »

### Search for anomalous single-photon production in MicroBooNE as a first test of the MiniBooNE low-energy excess

Oct. 1, 2021, 4:00 pm US/Central
Mark Ross-Lonergan, Columbia University
We report first results from a search for neutrino-induced neutral current (NC) resonant ∆(1232) baryon production followed by ∆ radiative decay. Data corresponding to MicroBooNE’s first three years of operations (6.80×1020 protons on target) are used to select single-photon events with one or zero protons and without charged leptons in the final state. The background... More »

### All seminars and events

Joint Experimental-Theoretical Physics Seminar, Fridays at 4:00 p.m. in One West

Theoretical Physics Seminar, Thursdays at 2:30 p.m. in Curia II

Colloquium, Wednesdays at 4:00 p.m. in One West

Events we organize