Alexandrou, Constantia; Bacchio, Simone; Burri, Sebastian Andreas; Finkenrath, Jacob; Gasbarro, Andrew; Hadjiyiannakou, Kyriakos; Jansen, Karl; Kanwar, Gurtej; Kostrzewa, Bartosz; Ottnad, Konstantin; Petschlies, Marcus; Pittler, Ferenc; Urbach, Carsten; Wenger, Urs (2023). η → γ * γ * transition form factor and the hadronic light-by-light η -pole contribution to the muon g − 2 from lattice QCD. Physical review. D - particles, fields, gravitation, and cosmology, 108(5) American Physical Society 10.1103/PhysRevD.108.054509
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We calculate the double-virtual η→γ∗γ∗ transition form factor Fη→γ∗γ∗(q21,q22) from first principles using a lattice QCD simulation with Nf=2+1+1 quark flavors at the physical pion mass and at one lattice spacing and volume. The kinematic range covered by our calculation is complementary to the one accessible from experiment and is relevant for the η-pole contribution to the hadronic light-by-light scattering in the anomalous magnetic moment aμ=(g−2)/2 of the muon. From the form factor calculation we extract the partial decay width Γ(η→γγ)=338(87)stat(17)syst eV and the slope parameter bη=1.34(28)stat(14)syst GeV−2. For the η-pole contribution to aμ we obtain aη-poleμ=13.8(5.2)stat(1.5)syst×10−11.
Item Type: |
Journal Article (Original Article) |
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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: |
Burri, Sebastian Andreas, Gasbarro, Andrew David, Kanwar, Gurtej Singh, Wenger, Urs |
Subjects: |
500 Science > 530 Physics 500 Science |
ISSN: |
2470-0010 |
Publisher: |
American Physical Society |
Language: |
English |
Submitter: |
Franziska Stämpfli |
Date Deposited: |
14 Dec 2023 11:59 |
Last Modified: |
14 Dec 2023 11:59 |
Publisher DOI: |
10.1103/PhysRevD.108.054509 |
BORIS DOI: |
10.48350/189761 |
URI: |
https://boris.unibe.ch/id/eprint/189761 |
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