Cascade Baryon Spectrum from Lattice QCD
Nilmani Mathur, John M. Bulava, Robert G. Edwards, Eric Engelson,, Balint Joo, Adam Lichtl, Huey-Wen Lin, Colin Morningstar, David G. Richards,, and Stephen J. Wallace
TL;DR
This paper uses lattice QCD to predict the masses and quantum numbers of cascade baryons, especially those with two strange quarks, aiding experimental discovery and understanding of these particles.
Contribution
It provides preliminary lattice QCD results for the cascade baryon spectrum, focusing on states with reduced chiral effects and narrow widths.
Findings
Predicted masses of unobserved cascade states
Determined spin and parity for some states
Used anisotropic N_f=2 Wilson lattices with high temporal resolution
Abstract
A comprehensive study of the cascade baryon spectrum using lattice QCD affords the prospect of predicting the masses of states not yet discovered experimentally, and determining the spin and parity of those states for which the quantum numbers are not yet known. The study of the cascades, containing two strange quarks, is particularly attractive for lattice QCD in that the chiral effects are reduced compared to states composed only of u/d quarks, and the states are typically narrow. We report preliminary results for the cascade spectrum obtained by using anisotropic N_f = 2 Wilson lattices with temporal lattice spacing inverse 5.56 GeV.
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