Stealth dark matter spectrum using LapH and Irreps

Richard C. Brower, Christopher Culver, Kimmy K. Cushman, George T. Fleming, Anna Hasenfratz, Dean Howarth, James Ingoldby, Xiao Yong Jin, Graham D. Kribs, Aaron S. Meyer, Ethan T. Neil, James C. Osborn, Evan Owen, Sungwoo Park, Claudio Rebbi, Enrico Rinaldi, David Schaich, Pavlos Vranas, Evan Weinberg, Oliver Witzel
High Energy Physics - Lattice, High Energy Physics - Lattice (hep-lat), High Energy Physics - Phenomenology (hep-ph)
FERMILAB-PUB-23-808-T, RIKEN-iTHEMS-Report-23, IPPP/23/71, LLNL-JRNL-858123
2023-12-13 00:00:00
We present non-perturbative lattice calculations of the low-lying meson and baryon spectrum of the SU(4) gauge theory with fundamental fermion constituents. This theory is one instance of stealth dark matter, a class of strongly coupled theories, where the lowest mass stable baryon is the dark matter candidate. This work constitutes the first milestone in the program to study stealth dark matter self-interactions. Here, we focus on reducing excited state contamination in the single baryon channel by applying the Laplacian Heaviside method, as well as projecting our baryon operators onto the irreducible representations of the octahedral group. We compare our resulting spectrum to previous work involving Gaussian smeared non-projected operators and find good agreement with reduced statistical uncertainties. We also present the spectrum of the low-lying odd-parity baryons for the first time.
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