Partons recombination

The fundamental interaction is the electromagnetic scattering of the electron on a parton qi. The details of how the struck parton recombines with those partons that did not interact, so as to form physical hadrons, is not well understood. Since partons or quarks are assumed not to exist as real physical particles there must be unit probability for them to transmute into physical hadrons. 

Hormozi K, Parton R, Coote J. Adjuvant and protective properties of native and recombinant bor-dctella pertussis adenylate cyclase toxin preparations in mice. FEMS Immunol Med Microbiol 1999 ... 

Smith, A. J. H., Sousa, M. A. D., Kwabi-Addo, B., Heppell-Parton, A., Impey, H., and Rabbitts, P. (1995) A site-directed chromosomal translocation induced in embryonic stem cells by Cre-loxP recombination. Nature Genetics 9,376-385. 

In case of cluster fragmentation models color-singlet clusters of partons form after the perturbative phase of jet development and then decay into the observed hadrons. The clusters originate from gluon splitting in quark pairs and subsequent recombination with neighboring quarks and antiquarks. Afterward, the clusters are assumed to decay isotropically in their rest frame into pairs of hadrons, where the branching ratios are determined by the density of states. 

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