2015/12/03 by Yasumichi Aoki, Aoki, Yasumichi, Tatsumi Aoyama +21
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Lattice (hep-lat) #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions
paper · doi:10.48550/arxiv.1512.00957
openalex publication_date 2015/12/03 · openalex created_date 2019/06/27 · openalex updated_date 2026/07/29
As a part of the project studying large Nf QCD, the LatKMI Collaboration has been investigating the SU(3) gauge theory with four fundamental fermions (four-flavor QCD). The main purpose of studying four-flavor QCD is to provide a qualitative comparison to Nf= 8, 12, 16 QCD; however, a quantitative comparison to real-world QCD is also interesting. To make such comparisons more meaningful, it is desirable to use the same kind of lattice action consistently, so that qualitative difference of different theories are less affected by artifacts of lattice discretization. Here, we adopt the highly-improved staggered quark action with the tree-level Symanzik gauge action (HISQ/tree), which is exactly the same as the setup for our simulations for SU(3) gauge theories with Nf=8, 12 and 16 fundamental fermions~\citeAoki:2013xza, Aoki:2012eq, Aoki:2014oma. In the next section, we show the fermion mass dependence of Fπ, ⟨ψψ⟩, Mπ, Mρ, MN and their chiral extrapolations. In section 3, preliminary results of the measurement of the mass of the flavor-singlet scalar bound state will be reported.