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Asymptotic properties of Born-improved amplitudes with gauge bosons in the final state
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Asymptotic properties of Born-improved amplitudes with gauge bosons in the final state
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| Papavassiliou, Joannis | |||
| Aquest document és un/a article, creat/da en: 1999 | |||
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| For processes with gauge bosons in the final state we show how to continuously connect with a single Born-improved amplitude the resonant region, where resummation effects are important, with the asymptotic region far away from the resonance, where the amplitude must reduce to its tree-level form. While doing so all known field-theoretical constraints are respected, most notably gauge-invariance, unitarity and the equivalence theorem. The calculations presented are based on the process ff¯→ZZ, mediated by a possibly resonant Higgs boson; this process captures all the essential features, and can serve as a prototype for a variety of similar calculations. By virtue of massive cancellations the resulting closed expressions for the differential and total cross-sections are particularly compact. | |||
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