منابع مشابه
Rising Publication Delays Inflate Journal Impact Factors
Journal impact factors have become an important criterion to judge the quality of scientific publications over the years, influencing the evaluation of institutions and individual researchers worldwide. However, they are also subject to a number of criticisms. Here we point out that the calculation of a journal's impact factor is mainly based on the date of publication of its articles in print ...
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We calculate electromagnetic pion form factors with an analytic model for αs(Q 2) which is infrared (IR) finite. We show that for the asymptotic pion distribution amplitude Fπ0γ∗γ agrees with the data, whereas the IR-enhanced hard contribution to Fπ and the soft part can jointly account for the data. 12.38.Bx, 12.38.Cy, 12.38.Lg, 13.40.Gp Typeset using REVTEX ∗Email: [email protected]...
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The Fat-Link Irrelevant Clover (FLIC) fermion action provides a new form of nonperturbative O(a) improvement and allows efficient access to the light quark-mass regime. FLIC fermions enable the construction of the nonperturbatively O(a)-improved conserved vector current without the difficulties associated with the fine tuning of the improvement coefficients. The simulations are performed with a...
متن کاملElastic Form Factors in Point-form Approach
Using the point-form approach to relativistic quantum mechanics, a covariant framework is presented for the calculation of proton and neutron electromagnetic form factors. Results for charge radii, magnetic moments, and electric as well as magnetic form factors are produced using the wave functions obtained in the socalled Goldstone-boson-exchange constituent quark model. All the predictions ar...
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Poincaré covariant quark models of the the nucleon, the ∆ resonance and their excitations are explored. The baryon states are represented by eigenfunctions of the four-velocity and a confining mass operator, which reproduces the empirical spectrum up to ∼ 1700 MeV to an accuracy of ∼ 6%. Models of constituent quark currents provide the relations between ground-state properties and transition am...
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ژورنال
عنوان ژورنال: Nuclear Physics B
سال: 1970
ISSN: 0550-3213
DOI: 10.1016/0550-3213(70)90099-4