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High Energy Physics - Theory

arXiv:2111.11570 (hep-th)
[Submitted on 22 Nov 2021 (v1), last revised 3 Mar 2023 (this version, v3)]

Title:Generalized unitarity method for unstable particles

Authors:Gabriel Menezes
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Abstract:In theories with unstable particles, unitarity is satisfied by the inclusion of only stable states in unitarity sums. Hence unitarity cuts are not to be taken through unstable particles. This raises a challenge to the generalized unitarity method, whose aim is to reconstruct amplitudes by analyzing sets of unitarity cuts. Nevertheless, under some general physical conditions, and perhaps some methodological modifications, we prove that the method is still reliable for one-loop amplitudes containing resonances. We discuss some simple examples which illustrate these features.
Comments: 23 pages, 2 figures; v2: Extensively revised version, many discussions have been extended, conclusions unchanged. Published version
Subjects: High Energy Physics - Theory (hep-th); High Energy Physics - Phenomenology (hep-ph)
Cite as: arXiv:2111.11570 [hep-th]
  (or arXiv:2111.11570v3 [hep-th] for this version)
  https://doi.org/10.48550/arXiv.2111.11570
Related DOI: https://doi.org/10.3390/universe9010028

Submission history

From: Gabriel Menezes [view email]
[v1] Mon, 22 Nov 2021 23:09:32 UTC (46 KB)
[v2] Tue, 25 Oct 2022 00:52:48 UTC (55 KB)
[v3] Fri, 3 Mar 2023 22:47:23 UTC (54 KB)
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