Abstract
Multi-particle states with additional pions are expected to result in a difficult-to-control excited-state contamination in lattice simulations. We show that heavy meson chiral perturbation theory can be employed to estimate the contamination due to two-particle Bpi states in various B-meson observables, like the B-meson decay constant and the B^*Bpi coupling. We work in the static limit and to next-to-leading order in the chiral expansion, i.e. including textrm{O}(p). The Bpi states are found to typically lead to an overestimation of the observables at the few percent level. We determine two of the LECs from Brightarrow pi form factor computations of the KEK group (Colquhoun et al. in Phys. Rev. D 106:054502, 2022) and discuss ways to determine the others. In particular, one LEC which is associated with smeared interpolating fields seems to be easily accessible and thus opens up a way to systematically study the effect of smearing on excited-state effects.
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