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Type: Journal article
Title: Chiral extrapolation of the magnetic polarizability of the neutral pion
Author: He, F.
Leinweber, D.B.
Thomas, A.W.
Wang, P.
Citation: Physical Review D, 2020; 102(11):114509-1-114509-8
Publisher: American Physical Society (APS)
Issue Date: 2020
ISSN: 2470-0010
Statement of
Fangcheng He, D.B. Leinweber, A.W. Thomas , and P. Wang
Abstract: The magnetic polarizability of the neutral pion has been calculated in the background magnetic-field formalism of lattice QCD. In this investigation, the chiral extrapolation of these lattice results is considered in a formalism preserving the exact leading nonanalytic terms of chiral perturbation theory. The (n)(f) = 2 + 1 numerical simulations are electro-quenched, such that the virtual sea quarks of the QCD vacuum do not interact with the background field. To understand the impact of this, we draw on partially quenched chiral perturbation theory and identify the leading contributions of quark-flow connected and disconnected diagrams. While electro-quenching does not impact the leading-loop contribution to the magnetic polarizability, the loops which generate the leading term have yet to be considered in lattice QCD simulations. Lattice QCD results are used to constrain the analytic terms in the chiral expansion and supplementing those with the two-loop result from chiral perturbation theory enables an evaluation of the polarizability at the physical quark mass. The resulting magnetic polarizability of the neutral pion is β(π)(0)=3.44(19)(stat)(37)(syst) × 10⁻⁴  fm³, which lies just above the 1σ error bound of the experimental measurement.
Rights: © 2020 American Physical Society
DOI: 10.1103/physrevd.102.114509
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