Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2002-08-13
Phys.Rev. D66 (2002) 094017
Physics
High Energy Physics
High Energy Physics - Phenomenology
35 pages, 4 figures, misprint in eq. (169) and typos corrected
Scientific paper
10.1103/PhysRevD.66.094017
In this third part of our calculation of the QCD NLO corrections to the photon impact factor we combine our previous results for the real corrections with the singular pieces of the virtual corrections and present finite analytic expressions for the quark-antiquark-gluon intermediate state inside the photon impact factor. We begin with a list of the infrared singular pieces of the virtual correction, obtained in the first step of our program. We then list the complete results for the real corrections (longitudinal and transverse photon polarization). In the next step we define, for the real corrections, the collinear and soft singular regions and calculate their contributions to the impact factor. We then subtract the contribution due to the central region. Finally, we combine the real corrections with the singular pieces of the virtual corrections and obtain our finite results.
Bartels Jochen
Colferai Dimitri
Gieseke St.
Kyrieleis Albrecht
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