The quark form factor at higher orders | Zendy

S. Moch | Zendy; J. A. M. Vermaseren | Zendy; A. Vogt | Zendy

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The quark form factor at higher orders

Author(s) -

S. Moch,

J. A. M. Vermaseren,

A. Vogt

Publication year - 2005

Publication title -

journal of high energy physics

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.998

H-Index - 261

eISSN - 1126-6708

pISSN - 1029-8479

DOI - 10.1088/1126-6708/2005/08/049

Subject(s) - physics , resummation , massless particle , quantum chromodynamics , form factor (electronics) , quark , dimensional regularization , particle physics , quantum electrodynamics , coupling constant , regularization (linguistics) , perturbation theory (quantum mechanics) , amplitude , mathematical physics , quantum mechanics , renormalization , artificial intelligence , computer science

We study the electromagnetic on-shell form factor of quarks in masslessperturbative QCD. We derive the complete pole part in dimensionalregularization at three loops, and extend the resummation of the form factor tothe next-to-next-to-leading contributions. These results are employed toevaluate the infrared finite absolute ratio of the time-like and space-likeform factors up to the fourth order in the strong coupling constant. Besidesfor the pole structure of higher-loop QCD amplitudes, our new contributions tothe form factor are also relevant for the high-energy limit of massive gaugetheories like QED. The highest-transcendentality component of our resultsconfirms a result recently obtained in N=4 Super-Yang-Mills theory.Comment: 16 pages, 1 figure, Late

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