The color structure of gluon emission |
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| Affiliation: | 1. Theoretical Physics Department, CERN, Geneva, Switzerland;2. Institute for Particle Physics Phenomenology, Department of Physics, Durham University, Durham DH1 3LE, UK;3. Rudolf Peierls Centre for Theoretical Physics, University of Oxford, Oxford OX1 3NP, UK;1. Center for Gravitational Physics, Yukawa Institute for Theoretical Physics, Kyoto University, Kyoto 606-8502, Japan;2. Centro de Astrofísica e Gravitação – CENTRA, Departamento de Física, Instituto Superior Técnico – IST, Universidade de Lisboa – UL, Av. Rovisco Pais 1, 1049-001 Lisboa, Portugal;1. Dipartimento di Fisica ed Astronomia, Università di Padova, Via Marzolo 8, 35131 Padova, Italy;2. INFN, Sezione di Padova, Via Marzolo 8, 35131 Padova, Italy;3. Institute for Theoretical Particle Physics, KIT, 76128 Karlsruhe, Germany |
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| Abstract: | The color structure of an arbitrary QCD diagram is studied. A basis for the color form factors of a generic amplitude is suggested, in which all the coherence effects are automatically and simply accounted for to the leading order in Nc. Some applications of this formalism are given for tree-level amplitudes describing processes with one or two pairs of fermions and radiation of gluons and photons. The different coherence properties of the abelian and non-abelian radiation are exhibited with some analytic and explicit examples, leading to the appearance of string-effect-like correlations for hard non-abelian radiation. |
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