Constraints on the hadronic light-by-light tensor in corner kinematics for the muon g − 2
Year: 2025
Type: article
Abstract: A bstract The dispersive approach to the hadronic light-by-light contribution to the muon g − 2 involves an integral over three virtual photon momenta appearing in the light-by-light tensor. Building upon previous works, we systematically derive short-distance constraints in the region where two momenta are large compared to the third, the so-called Melnikov-Vainshtein or corner region. We include gluonic corrections for the different scalar functions appearing in the Lorentz decomposition of the underlying tensor, and explicitly check analytic agreement with alternative operator product expansions in overlapping regimes of validity. A very strong pattern of cancellations is observed for the final g − 2 integrand. The last observation suggests that a very compact expression only containing the axial current form factors can provide a good approximation of the corner region of the hadronic light-by-light tensor.
Source: Journal of High Energy Physics
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: diamond
Awards: G1175115578, G1422035950, G1849103467, G2215508199, G2262748287, G2281333282, G300979063, Effective field theories from hadrons to Higgs, G34346518, G3480869486, The consequences of flavour: from precision measurements to fundamental physics, Precision Physics in Finite and Infinite Volume, G4214789025, G425668148, G5080475149, Problems in Quantum Chromo Dynamical Field Theory and Beyond, G6898042138, G7084143925, G792975244, G899293041
OpenAlex ID: W4408499477