Article Dans Une Revue Physical Review D Année : 2026

A model for baryon production in spin-dependent string fragmentation

Résumé

We introduce spin-1/2 baryons in the string+${}^3P_0$ model of hadronization, previously restricted to the production of pseudoscalar and vector mesons. Baryons are modeled as quark-diquark bound states and baryon production is described by the tunneling of diquark-antidiquark pairs at string breaking points. Diquarks can be scalar or pseudovector, the latter being produced in the relative ${}^5D_0$ state. Introducing the quark-baryon-diquark coupling, the relevant splitting amplitudes for the emission of baryons are constructed and used to explore analytically the model predictions. We find a Collins effect for baryon production in the fragmentations of transversely polarized quarks or diquarks as well as a baryon spontaneous transverse polarization. The hadronic decays of polarized hyperons are also included in the model, which is presented in a form suitable for the implementation in a Monte Carlo event generator.

Dates et versions

hal-05178489 , version 1 (23-07-2025)

Identifiants

Citer

Albi Kerbizi, Xavier Artru. A model for baryon production in spin-dependent string fragmentation. Physical Review D, 2026, 113 (3), pp.034007. ⟨10.1103/7dd2-61z8⟩. ⟨hal-05178489⟩
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