N_f=1+2 mass dependence of the topological susceptibility

2016/11/22 by Julien Frison, Frison, Julien, Ryuichiro Kitano +3 · 1 citation
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Lattice (hep-lat) #hep-lat

paper · pdf · doi:10.48550/arxiv.1611.07150

6 pages, talk presented at 34th annual International Symposium on Lattice Field Theory, 24-30 July 2016, University of Southampton, UK

arxiv created 2016/11/22 · arxiv updated 2016/11/23

Abstract

A massless up quark has long been proposed as a solution to the strong CP problem. While this solution is sometimes thought to have been excluded, it is actually still ill-defined. In this work, we study the mass dependence of the physical observable χ_t, the topological susceptibility. Assigning an unphysically large value to the down mass allows to be more sensitive to the non-perturbative effects behind the m_u=0 ambiguity. Preliminary results are presented for four masses of clover fermions.

Cited by

• Dynamical Up-quark Mass Generation in QCD-like theories

Related

• Lattice QCD results for the topological up-quark mass contribution: too small to rescue the m_u=0 solution to the strong CP problem
• Finite T topological Susceptibility with heavy Quarks
• The topological susceptibility and f_pi from lattice QCD
• Missing (up) Mass, Accidental Anomalous Symmetries, and the Strong CP Problem
• Partially Quenched Chiral Perturbation Theory and a Massless Up Quark: A Lattice Calculation of the Light-Quark-Mass Ratio