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Paper   IPM / Particles And Accelerator / 13975
School of Particles and Accelerator
  Title:   Fragmentation functions of g→ ηc (1S0) and gJ/ψ(3S1) considering the role of heavy quarkonium spin
  Author(s):  Seyed Mohammad Moosavi Nejad
  Status:   Published
  Journal: Eur. Phys. J. plus
  No.:  136
  Vol.:  130
  Year:  2015
  Supported by:  IPM
The production of heavy quarkonia is a powerful tool to test our understanding of strong interaction dynamics. It is well-known that the dominant production mechanism for heavy quarkonia with large transverse momentum is fragmentation. In this work we, analytically, calculate the QCD leading order contribution to the process-independent fragmentation functions (FFs) for a gluon to split into the vector (J/ψ) and pseudoscalar (ηc) S-wave charmonium states. The analyses of this paper differ in which we present, for the first time, an analytical form of the gJ/ψ FF using a different approach (Suzuki's model) in comparison with other results presented in literatures, where the Braaten's scheme was used and the two-dimensional integrals were presented for the gluon FFs which must be evaluated numerically. The universal fragmentation probability for the gJ/ψ is about 10−6 which is in good consistency with the result obtained in the Braaten's model.

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