“School of Particles And Accelerator”

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Paper   IPM / Particles And Accelerator / 14583
School of Particles and Accelerator
  Title:   Proton fragmentation functions considering finite-mass corrections
1.  Seyed Mohammad Moosavi Nejad
2.  Maryam Soleymaninia
3.  A Maktoubian
  Status:   Published
  Journal: Eur. Phys. J. A
  No.:  316
  Vol.:  52
  Year:  2016
  Supported by:  IPM
We present new sets of proton fragmentation functions (FFs) describing the production of protons from the gluon and each of the quarks, obtained by the NLO QCD fits to all relevant data sets of single-inclusive electron-positron annihilation. Specifically, we determine their uncertainties using the Gaussian method for error estimation. Our analysis is in good agreement with the e+e annihilation data. We also include finite-mass effects of the proton in our calculations, a topic with very little attention paid to in the literatures. Proton mass effects turn out to be appreciable for gluon and light quark FFs. The inclusion of finite-mass effects tends to improve the overall description of the data by reducing the minimized χ2 values significantly. As an application, we apply the extracted FFs to make predictions for the scaled-energy distribution of protons inclusively produced in top quark decays at next-to-leading order, relying on the universality and scaling violations of FFs.

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