Particle physics is a specific subcategory in physics dealing with subatomic particles and their interactions. Experiments done in this field often require a particle accelerator. An accelerator (as it sounds) accelerates extremely small particles to high speeds and collides them (either with another beam or a still object) in order to study the particles made to give context to the fundamental laws of the universe. The most famous particle accelerator is the circular accelerator called CERN in Geneva, Switzerland. "The name CERN is derived from the acronym for the French Conseil Européen pour la Recherche Nucléaire, a provisional body founded in 1952 with the mandate of establishing a world-class fundamental physics research organization in Europe" -Angles and Demons. The most recent fantastic discovery made with CERN is the discovery of the Higgs Boson, a particle that gives reality to the field (Higgs Field) that gives some particles their mass.
Relation to Computer Science:
Computer science becomes very important to this subject of physics when it comes to particle accelerators (especially big ones). It is essential in producing machines that require high energies needed to obtain certain interactions between particles. Computer science is needed in order to program the electronics (like detectors) and also is used to store information (in server farms) that the millions of interactions and collisions the particle accelerators can produce. The computers used in the facility also require a certain software necessary to analyze the collisions.
References:
https://home.cern/sites/home.web.cern.ch/files/styles/320/public/image/topic-stub/image/higgs_event_display.jpg?itok=H-IZs8wA
http://angelsanddemons.web.cern.ch/faq/what-does-cern-mean
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