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Model for baryon production in spin-dependent string fragmentation

Kerbizi, A. LU and Artru, X. (2026) In Physical Review D 113(3).
Abstract

We introduce spin-1/2 baryons in the string + 3P0 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 5D0 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... (More)

We introduce spin-1/2 baryons in the string + 3P0 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 5D0 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 pT-dependent transverse polarization. The model is presented in a form suitable for implementation in aMonte Carlo event generator. The hadronic decays of polarized hyperons are also included.

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author
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organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Physical Review D
volume
113
issue
3
article number
034007
publisher
American Physical Society
external identifiers
  • scopus:105029744099
ISSN
2470-0010
DOI
10.1103/7dd2-61z8
language
English
LU publication?
yes
id
5d592ffa-59d6-430b-9090-497e0952d2f4
date added to LUP
2026-03-03 12:05:27
date last changed
2026-03-03 12:06:01
@article{5d592ffa-59d6-430b-9090-497e0952d2f4,
  abstract     = {{<p>We introduce spin-1/2 baryons in the string + <sup>3</sup>P<sub>0</sub> 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 <sup>5</sup>D<sub>0</sub> 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 p<sub>T</sub>-dependent transverse polarization. The model is presented in a form suitable for implementation in aMonte Carlo event generator. The hadronic decays of polarized hyperons are also included.</p>}},
  author       = {{Kerbizi, A. and Artru, X.}},
  issn         = {{2470-0010}},
  language     = {{eng}},
  number       = {{3}},
  publisher    = {{American Physical Society}},
  series       = {{Physical Review D}},
  title        = {{Model for baryon production in spin-dependent string fragmentation}},
  url          = {{http://dx.doi.org/10.1103/7dd2-61z8}},
  doi          = {{10.1103/7dd2-61z8}},
  volume       = {{113}},
  year         = {{2026}},
}