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Universality-breaking effects in e+e- hadronic production processes
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DOI：10.1140/epjc/s10052-020-08821-y.png)
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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.
期刊
IF:
4.8
论文数:
1.8W
被引数:
4.7W
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引用论文
Kinematics of current region fragmentation in semi-inclusive deeply inelastic scattering半包容深非弹性散射中电流区域破碎的运动学.png)
PHYSICS LETTERS B
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PHYSICS LETTERS BIF4.5
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