Electromagnetic pion and kaon form factors in light-cone resummed perturbative QCD

Abstract

We analyze the electromagnetic pion and kaon form factor by including radiative and higher-twist effects within the framework of resummed pQCD in the space-like region. We focus on the transition from the perturbative to non-perturbative behavior in the phenomenological intermediate energy regime. Using a modified k_T factorization scheme with transverse degrees of freedom, we evaluate the non-perturbative soft contributions as distinct from the hard contributions, ensuring no double counting via the Ward identity at Q^2=0. The soft contributions are obtained via local quark-hadron duality while the hard contributions rest on the well known collinear factorization theorem using model wave functions with modified Brodsky-Huang-Lepage type ansatz and distribution amplitudes derived from light-cone QCD sum rules. Our analysis shows that the perturbative hard part prevails for large Q^2 beyond 50-100 GeV^2, while for low and moderate momentum transfers below 10-16 GeV^2 the soft contributions dominate over the hard part. Thus, we demonstrate the importance of including the soft contributions for explaining the experimental form-factor data.

arXiv comment40 pages, 19 figures, LATEX, corresponds to published version

References in corpus (51)

• Symmetry-breaking corrections to heavy-to-light B meson form factors at large recoil
• Analytic Model for the QCD Running Coupling with Universal ${\bar{\alpha }}_s(0)$ Value
• Theoretical Update of Pseudoscalar Meson Distribution Amplitudes of Higher Twist: The Nonsinglet Case
• Higher-Twist Distribution Amplitudes of the K Meson in QCD
• Measurement of the Charged Pion Electromagnetic Form Factor
• Determination of the Charged Pion Form Factor at Q2=1.60 and 2.45 (GeV/c)2
• Leading-power contributions to $B\to \pi ,\rho$ transition form factors
• Measurement of gamma p --> K+ Lambda and gamma p --> K+ Sigma0 at photon energies up to 2.6 GeV
• Evidence for a missing nucleon resonance in kaon photoproduction
• Determination of the pion charge form factor for Q^2=0.60-1.60 GeV^2
• Hyperon Photoproduction in the Nucleon Resonance Region
• Threshold resummation for exclusive B meson decays
• Pion Form Factor in QCD at Intermediate Momentum Transfers
• Beam polarization asymmetries for the p(gamma,K+)Lambda and p(gamma,K+)Sigma0 reactions at Egamma=1.5-2.4 GeV
• Pion form factor in QCD: From nonlocal condensates to NLO analytic perturbation theory
• Soft contribution to the pion form factor from light-cone QCD sum rules
• Kaon Distribution Amplitude from QCD Sum Rules
• Applicability of Perturbative QCD to $B\to D$ Decays
• Form Factors of Meson Decays in the Relativistic Constituent Quark Model
• Analytic coupling and Sudakov effects in exclusive processes: pion and ${\gamma }^{\ast }\gamma \to {\pi }^0$ form factors
• The pion form factor from lattice QCD with two dynamical flavours
• Analytic Approach in Quantum Chromodynamics
• Exploring Light-Cone Sum Rules for Pion and Kaon Form Factors
• SU(3) Breaking in K and K* Distribution Amplitudes
• The systematic study of $B\to \pi$ form factors in pQCD approach and its reliability
• Sudakov effects in B -> pi l nu form factors
• Form Factors and QCD in Spacelike and Timelike Region
• Pair term in the Electromagnetic Current within the Front-Form Dynamics: Spin-0 Case
• Lattice Computations of the Pion Form Factor
• Photon--meson transition form factors $\gamma {\pi }^0$, $\gamma \eta$ and $\gamma {\eta }^{\prime }$ at low and moderately high $Q^2$
• Analytic Approach to Perturbative QCD and Renormalization Scheme Dependence
• Pion form factors with improved infrared factorization
• Timelike form factors at high energy
• Pion Eletromagnetic Current in the Ligth-Cone Formalism
• Quark structure of the pion and pion form factor
• A Model for the Twist-3 Wave Function of the Pion and Its Contribution to the Pion Form Factor
• A Critical Analysis of the Proton Form Factor with Sudakov Suppression and Intrinsic Transverse Momentum
• Flavour SU(3) Symmetry in Charmless B Decays
• The perturbative pion-photon transition form factors with transverse momentum corrections
• Pion form factor at spacelike momentum transfers from local-duality QCD sum rule
• Dispersion approach to quark-binding effects in weak decays of heavy mesons
• Pion Form Factor in the $k_T$ Factorization Formalism
• QCD Sum Rules For Pion Wave Function Revisited
• Exclusive Processes at Intermediate Energy, Quark-Hadron Duality and the Transition to Perturbative QCD
• Conformal Symmetry and Pion Form Factor: Soft and Hard Contributions
• Deep Elastic Processes of Composite Particles in Field Theory and Asymptotic Freedom
• Transverse momentum distribution in hadrons. What can we learn from QCD?
• Conformal Symmetry and Pion Form Factor: Space- and Time-like Region
• Kaon Electromagnetic Form Factor within the $k_T$ Factorization Formalism and It's Light-Cone Wave Function
• Constraining the low energy pion electromagnetic form factor with space-like data
• Hard Exclusive Scattering in QCD

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• QCD sum rules with nonlocal condensates and the spacelike pion form factor
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• Valence-quark distributions of pions and kaons in a nuclear medium
• Pseudoscalar mesons with symmetric bound state vertex functions on the light front
• New results on Pionic Twist-3 Distribution Amplitudes within the QCD Sum Rules
• SU(3) symmetry breaking in decay constants and electromagnetic properties of pseudoscalar heavy mesons
• The pion wave function in covariant light-front dynamics
• Pions valence quark distributions in asymmetric nuclear matter at finite temperature
• Space- and time-like electromagnetic pion form factors in light-cone pQCD
• The $\rho {\gamma }^{\ast }\to \pi (\rho )$ transition form factors in the Perturbative QCD factorization approach
• Pion and Kaon form factors in the perturbative QCD approach
• Space-and Time-like Electromagnetic Kaon Form Factors
• Constraining the low energy Pion electromagnetic form factor with space-like and phase of time-like data
• Two-photon exchange effects in $e^{+}{e}^{-}\to {\pi }^{+}{\pi }^{-}$ and time-like pion electromagnetic form factor
• New constraints on the Pion EM form factor using Pi'(-Q^2)
• Electroweak properties of kaons in a nuclear medium
• RQM description of PS meson form factors, constraints from space-time translations, and underlying dynamics
• Twist-3 contributions to $\gamma \gamma \to {\pi }^{+}{\pi }^{-},K^{+}{K}^{-}$ processes in perturbative QCD approach
• Pion Form Factor in QCD: How to Calculate?