PoS - Proceedings of Science
Volume 430 - The 39th International Symposium on Lattice Field Theory (LATTICE2022) - Weak Decays and Matrix Elements
Estimating excited states contamination of $B \to \pi$ Form Factors Using Heavy Meson Chiral Perturbation Theory
O. Bar, A. Broll* and R. Sommer
Full text: pdf
Pre-published on: November 07, 2022
Published on: April 06, 2023
Using Heavy Meson Chiral Perturbation Theory (HMChPT), the $B^* \pi$ excited states contamination of the $B \to \pi$ vector form factors is computed to NLO in the chiral expansion and in the static limit. The results suggest that the excited states for $h_\parallel$ are of the order of a few percent whereas $h_\perp$ receives large negative contributions and thus might be significantly underestimated in lattice simulations.
DOI: https://doi.org/10.22323/1.430.0406
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