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arXiv · 2206.13788

A global QCD analysis of diffractive parton distribution function considering higher twist corrections within the xFitter framework

Maral Salajegheh·Hamzeh Khanpour·Ulf-G Meißner·Hadi Hashamipour·Maryam Soleymaninia
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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 $F_2^D$ 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-$β$ 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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Maral Salajegheh, Hamzeh Khanpour, Ulf-G Meißner, Hadi Hashamipour, Maryam Soleymaninia. 2022-06-28. A global QCD analysis of diffractive parton distribution function considering higher twist corrections within the xFitter framework. https://doi.org/10.1103/physrevd.106.054012

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