منابع مشابه
Extrapolations of Lattice Meson Form Factors
Abstract We use chiral perturbation theory to study the extrapolations necessary to make physical predictions from lattice QCD data for the electromagnetic form factors of pseudoscalar mesons. We focus on the quark mass, momentum, lattice spacing, and volume dependence and apply our results to simulations employing mixed actions of Ginsparg-Wilson valence quarks and staggered sea quarks. To det...
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In a double polarised electron scattering experiment data have been taken from which G n E can be extracted for Q 2 = 0.2 GeV 2 /c 2. We have measured asymmetries corresponding to the spin-spin correlation functions A ′ x and A ′ z and to the target analyzing power A 0 y. In order to investigate the influence of the reaction mechanisms and the different components of the 3 He wave function, als...
متن کاملStructure of the rho meson and the pion form-factor
From the electromagnetic form factor of the pion and from the decay modes of the τ lepton involving two or three pions one can see that the isovector–vector quark current couples strongly to the ρ meson whereas the isovector– axial-vector current couples strongly to the a1. Therefore such reactions provide excellent access to studies of the properties of (axial-)vector mesons. It has been shown...
متن کاملB - Meson Distribution Amplitude from the B → π Form Factor
Employing the light-cone sum rule approach in QCD, we relate the B-meson distribution amplitude to the B → π form factor at zero momentum transfer. In leading order, the sum rule is converted into a simple expression for the inverse moment λB of the distribution amplitude φ+. Using as an input the B → π form factor calculated from the light-cone sum rule in terms of pion distribution amplitudes...
متن کاملNucleon axial form factor from lattice QCD.
Results for the isovector axial form factors of the proton from a lattice QCD calculation are presented for both point-split and local currents. They are obtained on a quenched 163 × 24 lattice at β = 6.0 with Wilson fermions for a range of quark masses from strange to charm. For each quark mass, we find that the axial form factor falls off slower than the corresponding proton electric form fac...
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ژورنال
عنوان ژورنال: Physical Review D
سال: 1985
ISSN: 0556-2821
DOI: 10.1103/physrevd.32.3282