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Paper   IPM / Particles And Accelerator / 17033
School of Particles and Accelerator
  Title:   Global QCD analysis of diffractive parton distribution function considering higher twist corrections within the xFitter framework
1.  Maral Salajegheh
2.  Hamzeh Khanpour
3.  Ulf-G Meissner
4.  Hadi Hashamipour
5.  Maryam Soleymaninia
  Status:   Published
  Journal: Phys. Rev. D
  No.:  054012
  Vol.:  106
  Year:  2022
  Supported by:  IPM
We present {\tt SKMHS22}, a new set of diffractive parton distribution functions (PDFs) and their uncertainties at next-to-leading-order accuracy in perturbative QCD within the {\tt xFitter} framework. We describe all available diffractive DIS data sets from HERA and the most recent high-precision H1/ZEUS combined measurements considering three different scenarios. First, we extract the diffractive PDFs considering the standard twist-2 contribution. Then, we include the twist-4 correction from the ongitudinal virtual photons. Finally, the contribution of subleading Reggeon exchange to the structure-function $F_2^D$ is also examined. For the contribution of heavy flavors, we utilize the Thorne-Roberts general mass variable number scheme. We show that for those corrections, in particular, the twist-4 contribution allows to include the high-$\beta$ region and leads to a better description of the diffractive DIS data sets. We find that the inclusion of the subleading Reggeon exchange significantly improves the description of the diffractive DIS cross-section measurements. The resulting sets are in good agreement with all diffractive DIS data analyzed, which cover a wider kinematical range than in previous fits. The {\tt SKMHS22} diffractive PDFs sets presented in this work are available via the {\tt LHAPDF} interface. We also make suggestions for future research in this area.

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