Abstract
Factorization theorems allow to separate out the universal, non-perturbative content of the hadronic cross section from its perturbative part, which can be computed in perturbative QCD, up to the desired order. In this paper, we derive a rigorous proof of factorization of the e+e− → hX cross section, sensitive to the transverse momentum of the detected hadron with respect to the thrust axis, in a completely general framework, based on the Collins-Soper-Sterman approach. This procedure naturally leads to a partition of the e+e− → hX kinematics into three different regions, each associated to a different factorization theorem. In one of these regions, which covers the central and widest range, the factorization theorem has a new structure, which shares the features of both TMD and collinear factorization schemes. In the corresponding cross section, the role of the rapidity cut-off is investigated, as its physical meaning becomes increasingly evident. An algorithm to identify these three kinematic regions, based on ratios of observable quantities, is provided.
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Boglione, M., Simonelli, A. Kinematic regions in the e+e− → hX factorized cross section in a 2-jet topology with thrust. J. High Energ. Phys. 2022, 13 (2022). https://doi.org/10.1007/JHEP02(2022)013
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DOI: https://doi.org/10.1007/JHEP02(2022)013