Transverse-momentum resummation and the structure of hard factors at the\n NNLO

2014/07/18 by Leandro Cieri, Cieri, Leandro
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions

paper · pdf · doi:10.48550/arxiv.1407.4980

openalex publication_date 2014/07/18 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

In this proceeding we consider QCD radiative corrections to the production of\ncolourless high-mass systems in hadron collisions. At small transverse momentum\nthe logarithmically-enhanced contributions can be organized to all perturbative\norders by a universal resummation formula that depends on a single\nprocess-dependent hard factor. We show that the hard factor is directly related\nto the all-order virtual amplitude of the corresponding partonic process by a\nuniversal (process independent) formula, which we explicitly evaluate up to\ntwo-loop level. Once the next-to-next-to-leading order (NNLO) scattering\namplitude is available, the corresponding hard factor is directly determined.\nIt can be used in fully-exclusive perturbative calculations (via q_T\nsubtraction formalism) up to NNLO, in resummed calculations at full\nnext-to-next-to-leading logarithmic (NNLL) accuracy, and also, it's a necessary\ningredient to the next subsequent logarithmic order (N³LL).\n

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