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      Behaviour of the Absorptive Part of the W Electromagnetic Vertex

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          Abstract

          The absorptive part of the \(WW\gamma\) vertex induced by massive fermion loops is considered for different kinematical configurations. We show that the axial part of this vertex is different from zero not only when massive fermions are involved but also for massless fermion loops, if one of the W bosons is space-like and the other is time-like. We also discuss in what sense Low's soft photon theorem is satisfied.

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          Bremsstrahlung of Very Low-Energy Quanta in Elementary Particle Collisions

          F. E. Low (1958)
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            Finite Width Effects and Gauge Invariance in Radiative \(W\) Production and Decay

            The naive implementation of finite width effects in processes involving unstable particles can violate gauge invariance. For the example of radiative \(W\) production and decay, \(q\bar q' \to \ell\nu\gamma\), at tree level, it is demonstrated how gauge invariance is restored by including the imaginary part of triangle graphs in addition to resumming the imaginary contributions to the \(W\) vacuum polarization. Monte Carlo results are presented for the Fermilab Tevatron.
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              Author and article information

              Journal
              26 November 1996
              Article
              10.1016/S0550-3213(97)00263-0
              hep-ph/9611434
              81bb2373-6a16-49c6-8b4a-8ed79297db7c
              History
              Custom metadata
              UCL-IPT-96-20
              Nucl.Phys. B498 (1997) 55-67
              17 pages, 1 figure, LaTeX
              hep-ph

              High energy & Particle physics
              High energy & Particle physics

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