Determination of diffractive PDFs from global QCD analysis of inclusive diffractive DIS and dijet cross-section measurements at HERA

TL;DR

This paper updates diffractive parton distribution functions by incorporating recent HERA diffractive dijet data and higher-order QCD calculations, resulting in more accurate quark and gluon density determinations with improved data-theory agreement.

Contribution

The paper introduces new diffractive PDFs at NLO and NNLO accuracy that include dijet data, enhancing the constraints on gluon density in diffraction.

Findings

Excellent agreement between predictions and data at NLO and NNLO.

Inclusion of dijet data improves gluon density determination.

Higher order corrections significantly impact PDF extraction.

Abstract

We present an updated set of {\tt SKMHS} diffractive parton distribution functions (PDFs). In addition to the diffractive deep-inelastic scattering (diffractive DIS) data sets, the recent diffractive dijet cross sections measurements by the H1 experiment from the HERA collider are added to the data sample. The new set of diffractive PDFs, entitled {\tt SKMHS23} and {\tt SKMHS23-dijet}, are presented at next-to-leading order (NLO) and next-to-next-to-leading order (NNLO) accuracy in perturbative QCD. Since the gluons directly contribute to jet production through the boson-gluon fusion process, the data on diffractive dijet production in inclusive DIS help to constrain the gluon density, allowing for the determination of both the quark and gluon densities with better accuracy. The NLO and NNLO theory predictions calculated using both {\tt SKMHS23} and {\tt SKMHS23-dijet} are compared to the analyzed data showing excellent agreements. The effect arising from the inclusion of diffractive dijet data and higher order QCD corrections on the extracted diffractive PDFs and data/theory agreements are clearly examined and discussed.