Renormalization of massless fields with hard-soft infrared decomposition

✍ Scribed by J.H Lowenstein; P.K Mitter

• Book ID: 102986996
• Publisher: Elsevier Science
• Year: 1977
• Tongue: English
• Weight: 568 KB
• Volume: 105
• Category: Article
• ISSN: 0003-4916
• DOI: 10.1016/0003-4916(77)90230-5

✦ Synopsis

The decomposition of Feynman integrals with massless propagators into hard and soft contributions is systematically effected in renormalized field theory. It is shown that the decomposition leads to an elegant method of renormalizing massless field theories. Ultraviolet and infrared finite composite fields (normal products) are defined and renormalized field equations are derived. Exploiting a gauge principle, scalar ghosts arising in the hardsoft decomposition are eliminated and a renormalization group equation is derived to describe the effects of changes in the mass scale.