Quark structure of pseudoscalar mesons

Abstract

I review to which extent the properties of pseudoscalar mesons can be understood in terms of the underlying quark (and eventually gluon) structure. Special emphasis is put on the progress in our understanding of eta-eta' mixing. Process-independent mixing parameters are defined, and relations between different bases and conventions are studied. Both, the low-energy description in the framework of Chiral Perturbation Theory and the high-energy application in terms of light-cone wave functions for partonic Fock states, are considered. A thorough discussion of theoretical and phenomenological consequences of the mixing approach will be given. Finally, I will discuss mixing with other states pi^0, eta(c), ...).

48 pages, 7 figures, using epsfig.sty

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• Properties of the ${\eta }_q$ leading-twist distribution amplitude and its effects to the $B/D^{+}\to {\eta }^{(\prime )}{\ell }^{+}{\nu }_{\ell }$ decays
• The ${\pi }^0-\eta -{\eta }^{\prime }$ mixing in a generalized multi-quark interaction scheme
• The Coupling of eta Mesons to Quarks and Baryons from D_s^* -> D_s pi^0 Decay
• The Polarised Photon $g_1^{\gamma }$ Sum Rule at the Linear Collider and High Luminosity B Factories
• Revisiting the $P$-wave charmonium radiative decays $h_c\to \gamma {\eta }^{(\prime )}$ with relativistic corrections
• $\eta$ and ${\eta }^{\prime }$ mesons in nuclear matter and nuclei
• The study of $B\to J/\Psi {\eta }^{(\prime )}$ decays and determination of $\eta -{\eta }^{\prime }$ mixing angle
• Tension between $e^{+}{e}^{-}\to \eta {\pi }^{-}{\pi }^{+}$ and ${\tau }^{-}\to \eta {\pi }^{-}{\pi }^0{\nu }_{\tau }$ data and non-standard interactions
• eta-prime Meson Production in Nucleon-Nucleon Collisions Near The Threshold
• A $U_A(1)$ symmetry restoration scenario supported by the generalized Witten-Veneziano relation and its analytic solution
• e+e- annihilation to (pi0 pi0 gamma) and (pi0 eta gamma) as a source of information on scalar and vector mesons
• A theoretical determination of the eta-eta' mixing
• ${\bar{B}}_s^0\to ({\pi }^0{\eta }^{(\ast )},{\eta }^{(\ast )}{\eta }^{(\ast )})$ decays and the effects of next-to-leading order contributions in the perturbative QCD approach
• Effective-Lagrangian study of ${\psi }^{\prime }(J/\psi )\to VP$ and the insights into $\rho \pi$ puzzle
• Temperature Dependence of the Axion Mass in a Scenario Where the Restoration of Chiral Symmetry Drives the Restoration of the $U_A(1)$ Symmetry
• Tri-meson-mixing of $\pi$-$\eta$-${\eta }^{\prime }$ and $\rho$-$\omega$-$\varphi$ in the light-cone quark model
• Eta-nucleon and eta-prime-nucleon coupling constants in QCD and the role of gluons
• Axial U(1) dynamics in eta and eta' photoproduction
• A contact interaction model for the $\eta$ and ${\eta }^{\prime }$ mesons in a SDE-BSE approach to QCD: masses, decay widths and transition form factors
• Pseudoscalar Meson Mixing in Effective Field Theory
• $B\to K{\eta }^{(\prime )}\gamma$ decays in the standard model and in scenarios with universal extra dimensions
• Primakoff effect in eta-photoproduction off protons
• The Pion Form Factor Within the Hidden Local Symmetry Model
• Couplings of the eta and eta' Mesons to the Nucleon
• QCD analysis of electromagnetic Dalitz decays $J/\psi \to {\eta }^{(\prime )}{\ell }^{+}{\ell }^{-}$
• Determination of the strangeness contents of light-flavour isoscalars from its production rates in hadronic Z decays measured at LEP
• Eta-nucleon coupling constant in QCD with SU(3) symmetry breaking
• Instantons As Unitary Spin Maker
• Pion-Photon Transition Form Factor and Pion Distribution Amplitude in QCD: Facing the Enigmatic Behavior of the BaBar Data
• Scalar and Pseudoscalar Glueballs
• Penguin induced (B -> eta) transition form factor in light cone QCD
• $\eta$ and ${\eta }^{\prime }$ masses and decay constants
• ${\chi }_c$ decays and the gluon content of the ${\eta }^{\prime }$, $\eta$ mesons
• QCD sum rules for the pseudoscalar decay constants - To constrain the strange quark mass
• Improved measurement of the branching fraction of $h_c\to \gamma {\eta }^{\prime }/\eta$ and search for $h_c\to \gamma {\pi }^0$
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• On the $\eta$ and f${}_1$(1420) Couplings to the Nucleon
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• Mixing effects of $\eta -{\eta }^{\prime }$ in ${\Lambda }_b\to \Lambda {\eta }^{{(}^{\prime })}$ decays
• Radiative decays of light vector mesons in a quark level linear sigma model
• Strong and electromagnetic contributions to the U_A(1) anomaly and the P^0 to gamma gamma decays
• Correlations of $C$ and $CP$ violation in $\eta \to {\pi }^0{\ell }^{+}{\ell }^{-}$ and ${\eta }^{\prime }\to \eta {\ell }^{+}{\ell }^{-}$
• The physics of the $\eta$--${\eta }^{\prime }$ system versus $B^0\to J/\Psi \eta ({\eta }^{\prime })$ and $B_s\to J/\Psi \eta ({\eta }^{\prime })$ decays
• Account for axial vector mesons in the $\eta \to {\pi }^{+}{\pi }^{-}\gamma$ and ${\eta }^{\prime }\to {\pi }^{+}{\pi }^{-}\gamma$ decays
• Quark distributions and gluon contents of eta and etaprime
• Newly observed $\kappa$(2600) and the highly excited states of the $K_0^{\ast }$ family
• $\rho -\omega$ Mixing in $J/\psi \to VP$ Decays
• Pseudoscalar mixing in J/psi and psi(2S) decay
• Mirror matter admixtures in K_S to gamma gamma
• QCD analysis of the $P$-wave charmonium electromagnetic Dalitz decays $h_c\to {\eta }^{(\prime )}{\ell }^{+}{\ell }^{-}$
• Improved measurement of $\eta /{\eta }^{\prime }$ mixing in $B_{(s)}^0\to J/\psi {\eta }^{(\prime )}$ decays
• Mirror matter admixtures in K_L to mu^+ mu^-
• Mirror matter admixtures in K_L \to γγ
• Radiative vertex $VP\gamma$ and $\eta -{\eta }^{\prime }$ mixing in light-cone sum rules
• Heavy-to-light form factors: Symmetries at large recoil and calculation of alpha_s corrections
• Soft end-point and mass corrections to the eta' g*g* vertex function
• Flavour structure of low-energy hadron pair photoproduction
• Probing leptophobic dark sector with a pseudoscalar portal in the NA64 experiment at CERN
• Strange pentaquark molecules in QCD sum rules
• Probing neutrino-night-quark effective scalar interactions from neutrino masses
• Sub-leading power corrections to transition form factors of $\eta$ and ${\eta }^{\prime }$ mesons from twist-six contributions
• Quark flavor decomposition of the nucleon axial form factors