PHENIX Experiment

The PHENIX Experiment is the largest of the four experiments that have taken data at the Relativistic Heavy Ion Collider (RHIC) at Brookhaven National Laboratory. RHIC is the most versatile collider in the world, having collided nuclei from hydrogen (protons) to uranium, at center-of-mass energies ranging from a few to hundreds of GeV per nucleon-nucleon collision. RHIC furthermore has the ability to collide polarized proton beams, permitting a range of spin-spin and spin-momentum correlation measurements.

PHENIX, the Pioneering High Energy Nuclear Interaction eXperiment, is an experiment for the investigation of high energy collisions of heavy and light nuclei and protons. PHENIX is designed specifically to measure direct probes of the collisions such as electrons, muons, and photons. In broad strokes, the physics program of PHENIX is to study a wide range of QCD systems, from protons as the simplest stable QCD bound state to collections of QCD bound states in the form of nuclei, to QCD matter at such high energy densities that bound states can't form, and instead a quark-gluon plasma is created. PHENIX took data from 2000 until June 2016 and is now in full-time data analysis mode.

Click here for PHENIX publications and public talks.

sPHENIX is a proposed follow-up experiment at RHIC. The sPHENIX collaboration was officially formed in 2015. See the sPHENIX wiki for more information on the project.


The SeaQuest experiment (E906) is part of a series of fixed target Drell-Yan experiments that have taken place at Fermi National Accelerator Laboratory designed to measure the quark and antiquark structure of the nucleon and the modifications to that structure which occur when the nucleon is embedded in a nucleus. With these measurements, we are also able to quantify the energy loss of a colored parton (quark) travelling through cold, strongly-interacting matter. SeaQuest was commissioned in 2012, started taking physics data in the first half of 2014, and completed data taking in July 2017. Data analysis is ongoing.

Click here for SeaQuest publications and public talks.


The LHCb experiment, which stands for "Large Hadron Collider beauty" experiment, was designed primarily to study beauty (or "bottom") quark bound states and CP violation, related to the matter-antimatter asymmetry in the visible universe. However, with access to the high-energy proton-proton as well as the proton-lead collisions at the Large Hadron Collider, a wealth of QCD measurements sensitive to proton structure, quark and gluon dynamics, and hadronization is also possible.