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Finite-width effects in unstable-particle production at hadron colliders

Falgari, P. ; Papanastasiou, A.S. ; Signer, A.

The journal of high energy physics, 2013-05, Vol.2013 (5), p.1-40, Article 156 [Periódico revisado por pares]

Berlin/Heidelberg: Springer-Verlag

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  • Título:
    Finite-width effects in unstable-particle production at hadron colliders
  • Autor: Falgari, P. ; Papanastasiou, A.S. ; Signer, A.
  • Assuntos: Channels ; Classical and Quantum Gravitation ; Computation ; Counting ; Cross sections ; Elementary Particles ; Formalism ; Hadrons ; High energy physics ; Mathematical analysis ; Physics ; Physics and Astronomy ; Quantum Field Theories ; Quantum Field Theory ; Quantum Physics ; Relativity Theory ; String Theory
  • É parte de: The journal of high energy physics, 2013-05, Vol.2013 (5), p.1-40, Article 156
  • Notas: ObjectType-Article-1
    SourceType-Scholarly Journals-1
    ObjectType-Feature-2
    content type line 23
  • Descrição: A bstract We present a general formalism for the calculation of finite-width contributions to the differential production cross sections of unstable particles at hadron colliders. In this formalism, which employs an effective-theory description of unstable-particle production and decay, the matrix element computation is organized as a gauge-invariant expansion in powers of Γ X /m X , with Γ X and m X the width and mass of the unstable particle. This framework allows for a systematic inclusion of off-shell and non-factorizable effects whilst at the same time keeping the computational effort minimal compared to a full calculation in the complex-mass scheme. As a proof-of-concept example, we give results for an NLO calculation of top-antitop production in the partonic channel. As already found in a similar calculation of single-top production, the finite-width effects are small for the total cross section, as expected from the naïve counting ~ Γ t /m t ~ 1%. However, they can be sizeable, in excess of 10%, close to edges of certain kinematical distributions. The dependence of the results on the mass renormalization scheme, and its implication for a precise extraction of the top-quark mass, is also discussed.
  • Editor: Berlin/Heidelberg: Springer-Verlag
  • Idioma: Inglês
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