pdgLive Home   >   LIGHT UNFLAVORED MESONS ($\mathit S$ = $\mathit C$ = $\mathit B$ = 0)   >   ${{\mathit \pi}^{\pm}}$   >   $\mathit R$, SECOND AXIAL-VECTOR FORM FACTOR

${{\mathit \pi}^{\pm}}$ FORM FACTORS

$\mathit R$, SECOND AXIAL-VECTOR FORM FACTOR

INSPIRE   PDGID:

S008FR

VALUE EVTS DOCUMENT ID TECN  COMMENT $0.059$ ${}^{+0.009}_{-0.008}$ 98 EGLI 1989 SPEC ${{\mathit \pi}^{+}}$ $\rightarrow$ ${{\mathit e}^{+}}{{\mathit \nu}_{{e}}}{{\mathit e}^{+}}{{\mathit e}^{-}}$

References:

EGLI 1989 PL B222 533 Measurement of the Decay ${{\mathit \pi}^{+}}$ $\rightarrow$ ${{\mathit e}^{+}}{{\mathit \nu}_{{e}}}{{\mathit e}^{+}}{{\mathit e}^{-}}$ and Search for a Light Higgs Boson Also PL B175 97 First Observation of the Decay ${{\mathit \pi}^{+}}$ $\rightarrow$ ${{\mathit e}^{+}}{{\mathit \nu}_{{e}}}{{\mathit e}^{+}}{{\mathit e}^{-}}$ and a Determination of the Formfactors F$_{V}$, F$_{A}$, R

Except where otherwise noted, content of the 2023 Review of Particle Physics is licensed under a Creative Commons Attribution-NonCommercial 4.0 International (CC BY-NC 4.0) license. The publication of the Review of Particle Physics is supported by US DOE, MEXT (Japan), INFN (Italy), JPS and CERN. Individual collaborators receive support for their PDG activities from their respective institutes or funding agencies. © 2023. See LBNL disclaimers.