Virtuality Distributions and Pion Transition Form Factor
نویسندگان
چکیده
منابع مشابه
Pion Electromagnetic Form Factor in Virtuality Distribution Formalism
We discuss two applications of the Virtuality Distribution Amplitudes (VDA) formalism developed in our recent papers. We start with an overview of the main properties of the pion distribution amplitude emphasizing the quantitative measures of its width, and possibility to access them through the pion transition form factor studies. We formulate the basic concepts of the VDA approach and introdu...
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Article history: Received 5 May 2014 Received in revised form 9 June 2014 Accepted 30 June 2014 Available online 3 July 2014 Editor: B. Grinstein We outline basics of a new approach to transverse momentum dependence in hard processes. As an illustration, we consider hard exclusive transition process γ ∗γ → π0 at the handbag level. Our starting point is coordinate representation for matrix eleme...
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The behavior of the pion transition form factor for the processes γγ → π and γγ → π at space-like values of photon momenta is estimated within the nonlocal covariant quarkmeson model. The nonlocal contributions are important to install the axial anomaly at zero virualitites and give the contributions to the twist-4 power correction to the form factor at large virtualities. The leading and next-...
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The pion wave function is discussed in the light of the recent CLEO data on the πγ transition form factor. It turns out that the wave function is close to the asymptotic form whereas wave functions strongly concentrated in the end-point regions are disfavoured. Consequences for other exclusive quantities, as for instance the pion’s electromagnetic form factor, are also discussed. kroll@theorie....
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We discuss the photon to meson transition form factor for virtual photons, which can be measured in ee collisions. We demonstrate that this form factor is independent of the shape of the meson distribution amplitude over a wide kinematical range. This leads to a parameter-free prediction of perturbative QCD to leading twist accuracy, which has a status comparable to the famous leading-twist pre...
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ژورنال
عنوان ژورنال: International Journal of Modern Physics: Conference Series
سال: 2015
ISSN: 2010-1945,2010-1945
DOI: 10.1142/s2010194515600502