A global QCD analysis of diffractive parton distribution function considering higher twist corrections within the xFitter framework
Abstract
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 longitudinal virtual photons. Finally, the contribution of subleading Reggeon exchange to the structure-function 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- 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.
Cite
@article{arxiv.2206.13788,
title = {A global QCD analysis of diffractive parton distribution function considering higher twist corrections within the xFitter framework},
author = {Maral Salajegheh and Hamzeh Khanpour and Ulf-G Meißner and Hadi Hashamipour and Maryam Soleymaninia},
journal= {arXiv preprint arXiv:2206.13788},
year = {2022}
}