期刊
EUROPEAN PHYSICAL JOURNAL C
卷 81, 期 1, 页码 -出版社
SPRINGER
DOI: 10.1140/epjc/s10052-020-08821-y
关键词
-
资金
- European Unions Horizon 2020 research and innovation programme [824093]
Recent experimental measurements have explored the relationship between cross sections for single hadron production and hadron-pair production in e+e- annihilations within the framework of TMD factorization. A scheme has been proposed to relate TMD parton densities in 1-hadron and 2-hadron processes, addressing the regularization of rapidity divergences and the arbitrariness of cut-offs. This allows for global phenomenological studies of TMD physics and the analysis of data from different hadron classes.
Recent BELLE measurements provide the cross section for single hadron production in e+e- annihilations, differential in thrust and in the hadron transverse momentum with respect to the thrust axis. Universality breaking effects due to process-dependent soft factors make it very difficult to relate this cross sections to those corresponding to hadron-pair production in e+e- annihilations, where transverse momentum dependent (TMD) factorization can be applied. The correspondence between these two cross sections is examined in the framework of the Collins-Soper-Sterman factorization, in the collinear as well as in the TMD approach. We propose a scheme that allows to relate the TMD parton densities defined in 1-hadron and in 2-hadron processes, neatly separating, within the soft and collinear parts, the non-perturbative terms from the contributions that can be calculated perturbatively. The regularization of rapidity divergences introduces cut-offs, the arbitrariness of which will be properly reabsorbed by means of a mechanism closely reminiscent of a gauge transformation. In this way, we restore the possibility to perform global phenomenological studies of TMD physics, simultaneously analyzing data belonging to different hadron classes.
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