An exploratory study of heavy domain wall fermions on the lattice

作者：Boyle P^*; Juettner A^*; Marinkovic M Krstic^*; Sanfilippo F^*; Spraggs M^*; Tsang J T^*

来源：The Journal of High Energy Physics, 2016, 2016(4): 037.

DOI：10.1007/JHEP04(2016)037

• Heavy Quark Physics
• Lattice QCD
• Lattice Quantum Field Theory

We report on an exploratory study of domain wall fermions (DWF) as a lattice regularisation for heavy quarks. Within the framework of quenched QCD with the tree-level improved Symanzik gauge action we identify the DWF parameters which minimise discretisation effects. We find the corresponding effective 4 d overlap operator to be exponentially local, independent of the quark mass. We determine a maximum bare heavy quark mass of am(h) approximate to 0.4, below which the approximate chiral symmetry and O(a)-improvement of DWF are sustained. This threshold appears to be largely independent of the lattice spacing. Based on these findings, we carried out a detailed scaling study for the heavy-strange meson dispersion relation and decay constant on four ensembles with lattice spacings in the range 2.0-5.7 GeV. We observe very mild a(2) scaling towards the continuum limit. Our findings establish a sound basis for heavy DWF in dynamical simulations of lattice QCD with relevance to Standard Model phenomenology.

• 出版日期2016-4-6