EPJ Web of Conferences will be set by the publisher DOI: will be set by the publisher c © Owned by the authors, published by EDP Sciences, 2014 The Effect of Vector Meson Decays on Dihadron Fragmentation Functions

Abstract. Dihadron Fragmentation Functions (DFF) provide a vast amount of informa-tion on the intricate details of the parton hadronization process. Moreover, they provide a unique access to the "clean " extraction of nucleon transversity parton distribution func-tions in semi inclusive deep inelastic two hadron production process with a transversely polarised target. On the example of the u → pi+pi−, we analyse the properties of unpo-larised DFFs using their probabilistic interpretation. We use both the NJL-jet hadroniza-tion model and PYTHIA 8.1 event generator to explore the effect of the strong decays of the vector mesons produced in the quark hadronization process on the pseudoscalar DFFs. Our study shows that, even though it is less probable to produce vector mesons in the hadronization process than pseudo scalar mesons of the same charge, the products of their strong decays drastically affect the DFFs for pions because of the large combinato-rial factors. Thus, an accurate description of both vector meson production and decays are crucial for theoretical understanding of DFFs.