The flavor dependence of m ϱ /f π

• Main Authors: Daniel Nogradi, Lorinc Szikszai
• Format: Article
• Language: English
• Published: SpringerOpen 2019-05-01
• Series: Journal of High Energy Physics
• Subjects: Lattice QCD; Lattice Quantum Field Theory
• Online Access: http://link.springer.com/article/10.1007/JHEP05(2019)197

Abstract We calculate the m ϱ /f π ratio in the chiral and continuum limit for SU(3) gauge theory coupled to N f = 2, 3, 4, 5, 6 fermions in the fundamental representation. Keeping all systematic effects under full control we find no statistically significant N f -dependence; m ϱ /f π = 7.95(15). Assuming the KSRF-relations we conclude that 3 other low energy quantities related to the vector meson are also N f -independent within errors including the ϱππ coupling g ϱππ . If the model is thought of as a strong dynamics inspired composite Higgs model our results indicate that the experimentally most easily accessible new composite particle, the vector meson, and its properties may be robust and independent of the fermion content of the model as long as the gauge group is SU(3), provided N f -independence extends all the way to the conformal window.