### ColdQCD @LLNL

The ColdQCD group at LLNL has three main research thrusts: Hadron Interactions, Fundamental Symmetries, and Nuclear Matrix Elements.

**Hadron Interactions:**
The goal of this research thrust is to understand the exact lineage of the Nuclear Strong Force directly from QCD, particularly the aspects of the force that are poorly constrained empirically. Recent results of members of LLNL's LQCD group demonstrate the feasibility of extracting two-body scattering and bound states from LQCD, provided sufficient HPC resources. In collaboration with NPLQCD and scientists from LBL (CalLAT), the emphasis is on obtaining precision NN-interactions, and for studying the three-hadron interaction. This research includes determining algorithms for extracting partial waves excited state, which are developed and tested on the omega baryon system. Methods for extracting the tensor interaction will also be tested on this system.

**Fundamental Symmetries:** The goal of this research thrust is to understand, at the fundamental level, the interactions that give rise to violations of symmetries. Research in this area directly supports anticipated Intensity Frontier experiments, such as those planned at the SNS at ORNL. Example calculations include the Delta I=1,2 parity violating amplitudes, and development of algorithms for calculating disconnected diagrams. Our research has a strong eye towards understanding the neutron EDM as well as other sources of CP violation. This research will be done in collaboration with scientists from LBL (CalLAT).

**Nuclear Matrix Elements:** The goal of this research thrust is to provide nuclear matrix elements needed to constrain beyond the standard model (BSM) theories and their interaction with visible matter. This research directly supports anticipated Cosmic Frontier experiments.