May 23 – 27, 2022
Almo Collegio Borromeo, Pavia, Italy
Europe/Rome timezone

Transverse $Lambda$-hyperon polarization in e+e- annihilation processes within the TMD formalism.

May 24, 2022, 4:30 PM
Almo Collegio Borromeo, Pavia, Italy

Almo Collegio Borromeo, Pavia, Italy

P.zza Borromeo 9 27100 Pavia Italy
Standard talk Plenary session


Marco Zaccheddu (Istituto Nazionale di Fisica Nucleare)


Data from Belle Collaboration for associated (with a light unpolarized hadron) and single-inclusive production of transversely polarized $\Lambda$-hyperons in $e^+e^-$ annihilation processes allowed to extract, for the first time, the $\Lambda$ polarizing fragmentation function, by adopting a simplified TMD approach. Recent theoretical developments on the computation of cross sections for single-inclusive hadron production in $e^+e^-$ annihilation, within a Soft Collinear Effective Theory approach, combined with the CSS formalism for the double-hadron production case, have been used to perform a renewed analysis, adopting a proper TMD factorization scheme. A detailed a comparison with the former analysis will be discussed. Preliminary estimates for the transverse $\Lambda$ polarization at OPAL and at $\sqrt s = M_Z$ will also be presented.

Primary authors

Marco Zaccheddu (Istituto Nazionale di Fisica Nucleare) Umberto D'Alesio (Istituto Nazionale di Fisica Nucleare) Leonard Gamberg (Penn State University) Francesco Murgia (Istituto Nazionale di Fisica Nucleare)

Presentation materials