Work

First extraction of the Λ polarizing fragmentation function from Belle e+e− data

Year: 2020

Type: article

Abstract: We present a thorough phenomenological analysis of the experimental data from Belle Collaboration for the transverse $\mathrm{\ensuremath{\Lambda}}$ and $\overline{\mathrm{\ensuremath{\Lambda}}}$ polarization, measured in ${e}^{+}{e}^{\ensuremath{-}}$ annihilation processes, for the case of associated (with a light charged hadron) and inclusive (plus a jet) production. Within a transverse momentum dependent (TMD) approach we show how this intriguing phenomenon can be accounted for. This allows for the first ever extraction of the quark polarizing fragmentation function for a $\mathrm{\ensuremath{\Lambda}}$ hyperon, a TMD distribution giving the probability that an unpolarized quark fragments into a transversely polarized spin-$1/2$ hadron.

Source: Physical review. D/Physical review. D.

DOI: 10.1103/physrevd.102.054001

Authors: Umberto D’Alesio, Francesco Murgia, Marco Zaccheddu

Institutions: University of Cagliari, Istituto Nazionale di Fisica Nucleare, Sezione di Cagliari

Language: Latvian

Topic: Quantum Chromodynamics and Particle Interactions

Subfield: Nuclear and High Energy Physics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: hybrid

Funders: Strong, European Commission, Horizon 2020 Framework Programme

Awards: G14744916, G3111662533, The strong interaction at the frontier of knowledge: fundamental research and applications, G4191816635, G434337789