Electromagnetic transition form factors of mesons
نویسندگان
چکیده
منابع مشابه
Electromagnetic Transition Form Factors of Nucleon Resonances
Recent measurements of nucleon resonance transition form factors with CLAS at Jefferson Lab are discussed. The new data resolve a long-standing puzzle of the nature of the Roper resonance, and confirm the assertion of the symmetric constituent quark model of the Roper as the first radial excitation of the nucleon. The data on high Q nπ production confirm the slow fall off of the S11(1535) trans...
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The photon-meson transition form factors of light pseudoscalar mesons π0, η, and η′ are systematically calculated in a light-cone framework, which is applicable as a light-cone quark model at low Q2 and is also physically in accordance with the light-cone pQCD approach at large Q2. The calculated results agree with the available experimental data at high energy scale. We also predict the low Q2...
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Its value depends on the shape of φπ(x). In particular, using the asymptotic form[2, 1] φ as π (x) = 6fπx(1 − x) one obtains I0 = 3fπ which gives the F as γγ∗π0(Q ) = 4πfπ/Q 2 prediction for the large-Q behavior[1]. Brodsky and Lepage[1] proposed the interpolation formula F γγ∗π0(Q ) = 1/[πfπ(1 + Q2/s0)] which reproduces, for s0 = 4π f π , both the Q 2 = 0 value and the high-Q behavior. The sam...
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Preliminary results of a calculation of disconnected nucleon electromagnetic factors factors on the lattice are presented. The implementation of the numerical subtraction scheme is outlined. A comparison of results for electric and magnetic disconnected form factors on two lattice sizes with those of the Kentucky group is presented. Unlike previous results, the results found in this calculation...
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The determination of light hadron physics properties is of considerable interest to experimental labs such as Jefferson Lab. Many quantities, such as hadron form-factors and generalized structure functions, are not well understood theoretically. The available and forthcoming high precision experimental data presents considerable challenges and many opportunities for corresponding lattice calcul...
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ژورنال
عنوان ژورنال: Progress in Particle and Nuclear Physics
سال: 2012
ISSN: 0146-6410
DOI: 10.1016/j.ppnp.2011.12.051