We re-examine the perturbative properties of four-dimensional non-com\-mutative QED by extending the pinch techniques to the θ-deformed case. The explicit independence of the pinched gluon self-energy from gauge-fixing parameters and the absence of unphysical thresholds in the resummed propagators permits a complete check of the optical theorem for the off-shell two-point function. The known tachyonic dispersion relations are recovered within this framework, as well as their improved version in the (softly-broken) SUSY case. These applications should be considered as a first step in constructing gauge-invariant truncations of the Schwinger-Dyson equations in the non-commutative case. An interesting result of our formalism appears when considering the theory in two dimensions: we observe a finite gauge-invariant contribution to the photon mass because of a novel incarnation of IR/UV mixing, which survives the commutative limit when matter is present. © SISSA 2006
Caporaso, N., & Pasquetti, S. (2006). Gauge-invariant resummation formalism and unitarity in non-commutative QED. JOURNAL OF HIGH ENERGY PHYSICS, 2006(4) [10.1088/1126-6708/2006/04/016].
Citazione: | Caporaso, N., & Pasquetti, S. (2006). Gauge-invariant resummation formalism and unitarity in non-commutative QED. JOURNAL OF HIGH ENERGY PHYSICS, 2006(4) [10.1088/1126-6708/2006/04/016]. | |
Tipo: | Articolo in rivista - Articolo scientifico | |
Carattere della pubblicazione: | Scientifica | |
Presenza di un coautore afferente ad Istituzioni straniere: | No | |
Titolo: | Gauge-invariant resummation formalism and unitarity in non-commutative QED | |
Autori: | Caporaso, N; Pasquetti, S | |
Autori: | PASQUETTI, SARA (Ultimo) | |
Data di pubblicazione: | 2006 | |
Lingua: | English | |
Rivista: | JOURNAL OF HIGH ENERGY PHYSICS | |
Digital Object Identifier (DOI): | http://dx.doi.org/10.1088/1126-6708/2006/04/016 | |
Appare nelle tipologie: | 01 - Articolo su rivista |