How the recent BABAR data for P to γγ* affect the Standard Model predictions for the rare decays P to l+l-

Abstract

Measuring the lepton anomalous magnetic moments $(g-2)$ and the rare decays of light pseudoscalar mesons into lepton pairs $P\to l^{+}{l}^{-}$, serve as important tests of the Standard Model. To reduce the theoretical uncertainty in the standard model predictions, the data on the charge and transition form factors of the light pseudoscalar mesons play a significant role. Recently, new data on the behavior of the transition form factors $P\to \gamma \gamma \ast$ at large momentum transfer were supplied by the BABAR collaboration. There are several problems with the theoretical interpretation of these data: 1) An unexpectedly slow decrease of the pion transition form factor at high momenta, 2) the qualitative difference in the behavior of the pion form factor and the $\eta$ and ${\eta }^{\prime }$ form factors at high momenta, 3) the inconsistency of the measured ratio of the $\eta$ and ${\eta }^{\prime }$ form factors with the predicted one. We comment on the influence of the new BABAR data on the rare decay branchings.

11 pages, 3 figures

References in corpus (21)

• Measurement of the gamma gamma* --> pi0 transition form factor
• Muon g-2: Review of Theory and Experiment
• Precise measurement of the e+ e- to pi+ pi- (gamma) cross section with the Initial State Radiation method at BABAR
• Update of the e^+e^-\toπ^+π^- cross section measured by SND detector in the energy region 400<\sqrt{s}<1000 MeV
• Reevaluation of the hadronic contribution to the muon magnetic anomaly using new e+e- -> pi+pi- cross section data from BABAR
• Shape of Pion Distribution Amplitude
• On the Pion Distribution Amplitude Shape
• Measurement of the rare decay pi0 -> e+ e-
• Transition form factors of the pion in light-cone QCD sum rules with next-to-next-to-leading order contributions
• Rare decay pi0 -> e+e-: theory confronts KTeV data
• Pion transition form factor in k_T factorization
• Rare decay π^0 \to e^+e^- as a Test of Standard Model
• Electron, muon and tau magnetic moments: a theoretical update
• Constraining Light Bosons with Radiative ${\rm Y}(1S)$ Decays
• Complete structure dependent analysis of the decay $P\to l^{+}{l}^{-}$
• Photon distribution amplitudes and light-cone wave functions in chiral quark models
• QED radiative corrections to the decay pi^0 to e^+e^-
• On mass corrections to the decays P \to l^+l^-
• $\eta$ and ${\eta }^{\prime }$ Physics at BES-III
• Gluonic components of the pion and the transition form factor ${\gamma }^{\ast }{\gamma }^{\ast }\to {\pi }^0$
• Muon g-2, rare decays P \to l^+l^- and transition form factors P \to γγ^*

Cited by in corpus (19)

• The form factors for the photon to pseudoscalar meson transitions - an update
• The pseudoscalar hadronic channel contribution of the light-by-light process to the muon (g-2) within the nonlocal chiral quark model
• Electromagnetic decays of the neutral pion
• Two-photon form factors of the pi0, eta and eta-prime mesons in the chiral theory with resonances
• Two-loop QED radiative corrections to the decay pi0 -> e+ e- : The virtual corrections and soft-photon bremsstrahlung
• EKHARA Monte Carlo generator for e+e- to e+e-pi0 and e+e- to e+e- pi+pi- processes
• $\eta$ and ${\eta }^{\prime }$ decays into lepton pairs
• The puzzle of the π-> γγ* transition form factor
• Universal behaviour of the ${\gamma }^{\ast }\gamma \to ({\pi }^0,\eta ,{\eta }^{\prime })$ transition form factors
• On the ${\gamma }^{\ast }\gamma \to \pi (\eta ,{\eta }^{\prime })$ transition form factors
• The Pion-Photon Transition Form Factor and New Physics in the Tau Sector
• The ${\gamma }^{\ast }{\gamma }^{\ast }\to {\eta }_c$ transition form factor
• Pseudoscalar meson form factors and decays
• A model of a transition neutral pion formfactor measured in annihilation and scattering channels
• Direct Searches for New Physics Particles at BABAR
• Search for new ${\pi }^0$-like particles produced in association with a $\tau$-lepton pair
• EKHARA - new gamma gamma generator
• Electromagnetic decays of the neutral pion investigated in the Dyson-Schwinger formalism
• Elastic and transition form factors of light pseudoscalar mesons from QCD sum rules