scholarly journals Dispersive and chiral symmetry constraints on the light meson form factors

2000 ◽  
Vol 13 (3) ◽  
pp. 471
Author(s):  
I. Caprini
Keyword(s):  
Chiral Symmetry ◽  
Form Factors ◽  
Light Meson ◽  
Symmetry Constraints

scholarly journals Light meson electromagnetic form factors from three-flavor lattice QCD with exact chiral symmetry

2016 ◽  
Vol 93 (3) ◽  
Author(s):  
S. Aoki ◽  
G. Cossu ◽  
X. Feng ◽  
S. Hashimoto ◽  
T. Kaneko ◽  
...  
Keyword(s):  
Lattice Qcd ◽  
Chiral Symmetry ◽  
Form Factors ◽  
Light Meson ◽  
Electromagnetic Form Factors

scholarly journals Chiral symmetry constraints on resonant amplitudes

2018 ◽  
Vol 778 ◽  
pp. 43-47 ◽  
Author(s):  
Peter C. Bruns ◽  
Maxim Mai
Keyword(s):  
Chiral Symmetry ◽  
Symmetry Constraints

scholarly journals Critical analysis of theoretical estimates forB-to-light-meson form factors andB→ψK(K*) data using factorization

1995 ◽  
Vol 51 (11) ◽  
pp. 6235-6252 ◽  
Author(s):  
R. Aleksan ◽  
A. Le Yaouanc ◽  
L. Oliver ◽  
O. Pène ◽  
J.-C. Raynal
Keyword(s):  
Critical Analysis ◽  
Form Factors ◽  
Light Meson

scholarly journals Dispersive analysis of light-meson transition form factors

2019 ◽  
Vol 218 ◽  
pp. 03001
Author(s):  
Bastian Kubis
Keyword(s):  
Light Scattering ◽  
Magnetic Moment ◽  
Anomalous Magnetic Moment ◽  
Form Factors ◽  
Experimental Information ◽  
Light Meson ◽  
Transition Form ◽  
Dispersive Analysis

We discuss status and prospects of a dispersive analysis of the π0, η, and η ′ transition form factors. Particular focus is put on the various pieces of experimental information that serve as input to such a calculation. These can help improve on the precision of an evaluation of the light pseudoscalar pole contributions to hadronic light-by-light scattering in the anomalous magnetic moment of the muon.**

scholarly journals Pseudoscalar pole contribution to the hadronic light-by-light piece of aμ

2018 ◽  
Vol 192 ◽  
pp. 00027
Author(s):  
Adolfo Guevara ◽  
Pablo Roig ◽  
Juan José Sanz Cillero
Keyword(s):  
Form Factor ◽  
Chiral Symmetry ◽  
Chiral Symmetry Breaking ◽  
Form Factors ◽  
Effective Field ◽  
Pole Contribution ◽  
Symmetry Relations ◽  
The Impact ◽  
Best Fit ◽  
Momentum Region

We have studied the P → γ⋆ γ⋆ form factor in Resonance Chiral Theory, with P = π0; η, η', to compute the contribution of the pseudoscalar pole to the hadronic light-by-light piece of the anomalous magnetic moment of the muon. In this work we allow the leading U(3) chiral symmetry breaking terms, obtaining the most general expression for the form factor of order O(m2P). The parameters of the Effective Field Theory are obtained by means of short distance constraints on the form factor and matching with the expected behavior from QCD. Those parameters that cannot be fixed in this way are fitted to experimental determinations of the form factor within the spacelike momentum region of the virtual photon. Chiral symmetry relations among the transition form factors for π0, η and η' allow for a simultaneous fit to experimental data for the three mesons. This shows an inconsistency between the BaBar π0 data and the rest of the experimental inputs. Thus, we find a total pseudoscalar pole contribution of aP,HLbLη = (8:47 ± 0:16) · 10-10 for our best fit (neglecting the BaBar π0 data). Also, a preliminary rough estimate of the impact of NLO in 1=NC corrections and higher vector multiplets (asym) enlarges the uncertainty up to aP,HLbLη = (8:47 ± 0:16stat ± 0:09NC +0:5 -0:0asym).

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