Nov 25 – 29, 2019
University of Pavia
Europe/Rome timezone

Universality and universality-breaking effects in factorized e+e- hadroproduction cross sections

Nov 28, 2019, 11:30 AM
Aula Foscolo (University of Pavia)

Aula Foscolo

University of Pavia

Via Strada Nuova 65, Pavia


Andrea Simonelli (Istituto Nazionale di Fisica Nucleare)


Recent BELLE measurements provide the cross section for single hadron production from e+e- annihilations, differential 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 section to that corresponding to hadron-pair production in e+e- annihilations, where TMD fragmentation functions are defined
through the so-called "square-root definition".
I will examine this correspondence in the framework of CSS factorization and provide the sketch of a scheme that might allow to relate 1-jet to 2-jet e+e- cross sections, neatly separating soft and collinear non-perturbative effects from the terms which can be calculated using a perturbative approach.

Primary author

Andrea Simonelli (Istituto Nazionale di Fisica Nucleare)

Presentation materials