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Asymptotic behavior of meson transition form factors

Journal Article · · Journal of High Energy Physics (Online)
 [1];  [2]
  1. Univ. of Bern (Switzerland). Inst. for Theoretical Physics. Albert Einstein Center for Fundamental Physics; Univ. of Washington, Seattle, WA (United States). Inst. for Nuclear Theory; OSTI
  2. Univ. of California, San Diego, La Jolla, CA (United States). Dept. of Physics
One of the open issues in evaluations of the contribution from hadronic light-by-light scattering to the anomalous magnetic moment of the muon (g - 2)µ concerns the role of heavier scalar, axial-vector, and tensormeson intermediate states. The coupling of axial vectors to virtual photons is suppressed for small virtualities by the Landau–Yang theorem, but otherwise there are few rigorous constraints on the corresponding form factors. In this paper, we first derive the Lorentz decomposition of the two-photon matrix elements into scalar functions following the general recipe by Bardeen, Tung, and Tarrach. Based on this decomposition, we then calculate the asymptotic behavior of the meson transition form factors from a light-cone expansion in analogy to the asymptotic limits for the pseudoscalar transition form factor derived by Brodsky and Lepage. Finally, we compare our results to existing data as well as previous models employed in the literature.
Research Organization:
Univ. of California, San Diego, CA (United States); Univ. of Washington, Seattle, WA (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
FG02-00ER41132; SC0009919
OSTI ID:
1799995
Journal Information:
Journal of High Energy Physics (Online), Journal Name: Journal of High Energy Physics (Online) Journal Issue: 5 Vol. 2020; ISSN 1029-8479
Publisher:
Springer BerlinCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (2)

Axial vector transition form factors in holographic QCD and their contribution to the muon g-2 conference January 2021
The interplay of transverse degrees of freedom and axial-vector mesons with short-distance constraints in g-2 text January 2020

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