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Next-to-next-to-leading order prediction for the photon-to-pion transition form factor

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Polje Vrijednost
 
Relacija http://fulir.irb.hr/548/
http://link.aps.org/doi/10.1103/PhysRevD.68.014013
10.1103/PhysRevD.68.014013
 
Naslov Next-to-next-to-leading order prediction for the photon-to-pion transition form factor
 
Autor Melić, Blaženka
Muller, D.
Passek-Kumerički, Kornelija
 
Tema Physics
Astronomy and Astrophysics
 
Opis We evaluate the next-to-next-to-leading order corrections to the hard-scattering amplitude of the photon-to-pion transition form factor. Our approach is based on the predictive power of the conformal operator product expansion, which is valid for a vanishing beta function in the so-called conformal scheme. The Wilson coefficients appearing in the nonforward kinematics are then entirely determined from those of the polarized deep inelastic scattering known to next-to-next-to-leading order accuracy. We propose different schemes to include explicitly also the conformal symmetry breaking term proportional to the beta function and discuss numerical predictions calculated in different kinematical regions. It is demonstrated that the photon-to-pion transition form factor can provide a fundamental testing ground for our QCD understanding of exclusive reactions.
 
Izdavač American Physical Society
 
Datum 2003-07
 
Vrsta resursa Article
PeerReviewed
 
Format (na primjer PDF) application/pdf
 
Jezik en
english
 
Identifikator http://fulir.irb.hr/548/1/Next-to-next-leading.pdf
Melić, Blaženka; Muller, D.; Passek-Kumerički, Kornelija (2003) Next-to-next-to-leading order prediction for the photon-to-pion transition form factor. Physical Review D, 68 (1). 014013-1-014013-36. ISSN 1550-7998