Hoferichter, Martin; Colangelo, Gilberto; Bai, Long; Kubis, Bastian; Ruiz de Elvira, Jacobo; Stamen, Dominik; Stoffer, Peter (2022). Chiral extrapolation of hadronic vacuum polarization and isospin-breaking corrections. In: The 39th International Symposium on Lattice Field Theory 430. Trieste, Italy: Sissa Medialab 10.22323/1.430.0316
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By far the biggest contribution to hadronic vacuum polarization (HVP) arises from the two-pion channel. Its quark-mass dependence can be evaluated by combining dispersion relations with chiral perturbation theory, providing guidance on the functional form of chiral extrapolations, or even interpolations around the physical point. In addition, the approach allows one to estimate in a controlled way the isospin-breaking (IB) corrections that arise from the pion mass difference. As an application, we present an updated estimate of phenomenological expectations for electromagnetic and strong IB corrections to the HVP contribution to the anomalous magnetic moment of the muon. In particular, we include IB effects in the K¯K
channel, which are enhanced due to the proximity of the K¯K
threshold and the ϕ
resonance. The resulting estimates make it unlikely that the current tension between lattice-QCD and data-driven evaluations of the HVP contribution is caused by IB corrections.
Item Type: |
Conference or Workshop Item (Paper) |
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Division/Institute: |
08 Faculty of Science > Institute of Theoretical Physics 10 Strategic Research Centers > Albert Einstein Center for Fundamental Physics (AEC) |
UniBE Contributor: |
Hoferichter, Martin, Colangelo, Gilberto, Bai, Long |
Subjects: |
500 Science > 530 Physics |
Publisher: |
Sissa Medialab |
Language: |
English |
Submitter: |
Binia Marti |
Date Deposited: |
17 Mar 2023 10:48 |
Last Modified: |
17 Mar 2023 23:27 |
Publisher DOI: |
10.22323/1.430.0316 |
BORIS DOI: |
10.48350/179680 |
URI: |
https://boris.unibe.ch/id/eprint/179680 |
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