Stealth dark matter spectrum using Laplacian Heaviside smearing and irreducible representations

Brower, R. C.; Culver, C.; Cushman, K. K.; Fleming, G. T.; Hasenfratz, A.; Howarth, D.; Ingoldby, J.; Jin, X. Y.; Kribs, G. D.; Meyer, A. S.; Neil, E. T.; Osborn, J. C.; Owen, E.; Park, S.; Rebbi, C.; Rinaldi, E.; Schaich, D.; Vranas, P.; Weinberg, E.; Witzel, O.; Lattice Strong Dynamics (LSD) Collaboration

Abstract

We present nonperturbative lattice calculations in the quenched approximation 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 nonprojected 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.

Citation

Brower, R., Culver, C., Cushman, K., Fleming, G., Hasenfratz, A., Howarth, D., Ingoldby, J., Jin, X., Kribs, G., Meyer, A., Neil, E., Osborn, J., Owen, E., Park, S., Rebbi, C., Rinaldi, E., Schaich, D., Vranas, P., Weinberg, E., Witzel, O., & Lattice Strong Dynamics (LSD) Collaboration. (2024). Stealth dark matter spectrum using Laplacian Heaviside smearing and irreducible representations. Physical Review D, 110(9), https://doi.org/10.1103/physrevd.110.095001

• Journal Article Type: Article
• Acceptance Date: Jun 27, 2024
• Online Publication Date: Nov 5, 2024
• Publication Date: Nov 5, 2024
• Deposit Date: Dec 4, 2024
• Publicly Available Date: Dec 4, 2024
• Journal: Physical Review D
• Print ISSN: 2470-0010
• Electronic ISSN: 2470-0029
• Publisher: American Physical Society
• Peer Reviewed: Peer Reviewed
• Volume: 110
• Issue: 9
• DOI: https://doi.org/10.1103/physrevd.110.095001
• Public URL: https://durham-repository.worktribe.com/output/3200790