Signal at subleading order in lattice HQET

Abstract

We discuss the correlators in lattice HQET that are needed to go beyond the static theory. Based on our implementation in the Schrödinger functional we focus on their signal-to-noise ratios and check that a reasonable statistical precision can be reached in quantities like $f_{B_s}$ and $M_{B^{\star }}-M_B$.

Comments: 3 pages, Lattice2004(heavy), v2: corrected definition of X^{kin/spin}