Hadron spectrum of QCD with one quark flavor

TL;DR

This paper reports on lattice QCD simulations with a single quark flavor, analyzing the spectrum of bound states and exploring potential supersymmetry relics in the mass spectrum.

Contribution

It presents new lattice simulation results for one-flavor QCD using improved actions and discusses potential supersymmetry signatures in the spectrum.

Findings

Lightest pion mass ~300 MeV at the lightest quark mass

Computed masses of scalar, pseudoscalar mesons, glueball, and baryon

Discussion of SUSY relics in the mass spectrum

Abstract

The latest results of an ongoing project for the lattice simulation of QCD with a single quark flavor are presented. The Symanzik tree-level-improved Wilson action is adopted in the gauge sector and the (unimproved) Wilson action for the fermion. Results from new simulations with one step of Stout-smearing (rho=0.15) in the fermion action are discussed. The one-flavor theory is simulated by a polynomial hybrid Monte Carlo algorithm (PHMC) at beta=4.0 corresponding to a = 0.13fm, on 16^3x32 and 24^3x48 lattices; the box-size is L = 2.1fm and L = 3.1fm, respectively. At the lightest simulated quark mass the (partially quenched) pion mass is ~300 MeV. The masses of the lightest bound states are computed, including the flavor singlet scalar and pseudoscalar mesons sigma_s and eta_s, the scalar glueball 0^++, and the Delta^++ baryon. Relics of SUSY in the mass spectrum, expected from a large N_c orientifold equivalence with the N=1 supersymmetric Yang-Mills theory, are discussed.