PT Journal
AU Estrada, EJ
   Gonzalez-Solis, S
   Guevara, A
   Roig, P
TI Improved π0, η, η′ transition form factors in resonance chiral theory and their aμHLbL contribution
SO Journal of High Energy Physics
JI J. High Energy Phys.
PY 2024
BP 203
EP 48pp
VL 12
IS 12
DI 10.1007/JHEP12(2024)203
LA English
DE Chiral Lagrangian; Effective Field Theories of QCD
AB Working with Resonance Chiral Theory, within the two resonance multiplets saturation scheme, we satisfy leading (and some subleading) chiral and asymptotic QCD constraints and accurately fit simultaneously the pi 0, eta, eta ' transition form factors, for single and double virtuality. In the latter case, we supplement the few available measurements with lattice data to ensure a faithful description. Mainly due to the new results for the doubly virtual case, we improve over existing descriptions for the eta and eta '. Our evaluation of the corresponding pole contributions to the hadronic light-by-light piece of the muon g – 2 read: a μpi 0-pole=61.9 +/- 0.6-1.5+2.4x10-11, a μeta-pole=15.2 +/- 0.5-0.8+1.1x10-11 and a μeta '-pole=14.2 +/- 0.7-0.9+1.4x10-11, for a total of a μpi 0+eta+eta '-pole=91.3 +/- 1.0-1.9+3.0x10-11, where the first and second errors are the statistical and systematic uncertainties, respectively.
ER