4-8 November 2024
Mexico/General timezone
Home > Timetable > Contribution details

Contribution

Improved evaluation of the pi^0/eta/eta' contributions to a_mu^{P-pole,HLbL} in RChT

Speakers

  • Mr. Emilio José ESTRADA GONZÁLEZ

Primary authors

Content

orking 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 $\pi^{0},\eta,\eta^{\prime}$ 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 $\eta^\prime$. Our evaluation of the corresponding pole contributions to the hadronic light-by-light piece of the muon $g-2$ read: $a_\mu^{\pi^{0}\text{-}\rm{pole}}=\left(60.4\pm0.5^{+3.2}{-1.8}\right)\times10^{-11}$, $a\mu^{\eta\text{-}\mathrm{pole}}=\left(15.2\pm0.5^{+1.1}{-0.7}\right)\times10^{-11}$ and $a\mu^{\eta^\prime\text{-}\rm{pole}}=\left(14.4\pm0.8^{+1.4}{-1.0}\right)\times10^{-11}$, for a total of $a\mu^{\pi^0+\eta+\eta^{\prime}\text{-}\rm{pole}}=\left(90.0\pm1.1^{+3.7}_{-2.2}\right)\times10^{-11}$, where the first and second error are the statistical and systematic uncertainties, respectively.

Work in collaboration with Sergi Gonzàlez-Solís, Adolfo Guevara & Pablo Roig