Data di Pubblicazione:
2024
Abstract:
In the context of infrared subtraction algorithms beyond next-to-leading
order, it becomes necessary to consider multiple infrared limits of scattering
amplitudes, in which several particles become soft or collinear in a
strongly-ordered sequence. We study these limits from the point of view of
infrared factorisation, and we provide general definitions of strongly-ordered
soft and collinear kernels in terms of gauge-invariant operator matrix
elements. With these definitions in hand, it is possible to construct local
subtraction counterterms for strongly-ordered configurations. Because of their
factorised structure, these counterterms cancel infrared poles of real-virtual
contributions by construction. We test these ideas at tree level for multiple
emissions, and at one loop for single and double emissions, contributing to
NNLO and N3LO distributions, respectively.
Tipologia CRIS:
03A-Articolo su Rivista
Keywords:
High Energy Physics - Phenomenology; High Energy Physics - Phenomenology
Elenco autori:
Lorenzo Magnea; Calum Milloy; Chiara Signorile-Signorile; Paolo Torrielli
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