Research

ATLAS experiment

I have been a collaborator of the ATLAS Experiment since 2006. The experiment is located at CERN, Geneva, and has been studying proton-proton collisions at extreme high energies produced by the Large Hadron Collider (LHC). Using the data collected by the ATLAS detector since 2009, the Harvard ATLAS group has made precise measurements of the Standard Model processes and searched for new particles predicted by theories beyond the Standard Model.

Using the data collected between 2010 and 2018, my group has published many physics results. They include measurements of the production cross sections of WZ, tt+W, and four top quarks, and searches for supersymmetric particles and dark matter particles.

Starting 2022, the LHC is colliding protons at the center-of-mass energy of 13.6 TeV. With the new data, my group plans to study different Standard Model processes and to serach for long-lived particles.

For the next phase of the experiment, my group is working on the ATLAS ITk (inner tracker) upgrade project. Our goal is to replace the ATLAS inner tracking system with a low-mass, radiation-hard, all-silicon device before the high-luminosity LHC.

LUX experiment

Between 2009 and 2011, I was a collaborator of a Dark Matter experiment called LUX, which stands for Large Underground Xenon. As the name suggests, it used a large amount (300 kg in total) of liquid xenon, located in an underground cavern. The goal of the experiment was to detect the Dark Matter particles, which make up >80% of the mass of the universe. The experiment was built in the Homestake gold mine, where Ray Davis built his solar neutrino experiment 40 years ago.

BABAR experiment

I worked on the BABAR Experiment between 1996 and 2008. The experiment studied the phenomenon of CP violation using the PEP-II e+e collider.