First global next-to-leading order determination of diffractive parton distribution functions and their uncertainties within the xFitter framework

Abstract

We present GKG18-DPDFs, a next-to-leading order (NLO) QCD analysis of diffractive parton distribution functions (diffractive PDFs) and their uncertainties. This is the first global set of diffractive PDFs determined within the xFitter framework. This analysis is motivated by all available and most up-to-date data on inclusive diffractive deep inelastic scattering (diffractive DIS). Heavy quark contributions are considered within the framework of the Thorne-Roberts (TR) general mass variable flavor number scheme (GM-VFNS). We form a mutually consistent set of diffractive PDFs due to the inclusion of high-precision data from H1/ZEUS combined inclusive diffractive cross sections measurements. We study the impact of the H1/ZEUS combined data by producing a variety of determinations based on reduced data sets. We find that these data sets have a significant impact on the diffractive PDFs with some substantial reductions in uncertainties. The predictions based on the extracted diffractive PDFs are compared to the analyzed diffractive DIS data and with other determinations of the diffractive PDFs.

Role of higher twist effects in diffractive DIS and determination of diffractive parton distribution functions

“…After introducing the phenomenological framework and experimental diffractive DIS datasets used in the present analysis, in this section, we aim to present the results obtained for diffractive PDFs with and without considering the HT effects. In order to present more detailed discussions on our findings, we also compare the results with other available diffractive PDFs analyses from H1-2006 [16], ZEUS-2010 [17] and GKG18 [13]. Several comparisons of the NLO theoretical predictions and experimental data will be presented to check the quality of the fits in different kinematics.…”

“…We have used three different datasets in this analysis. The latest H1/ZEUS combined dataset for the reduced diffractive cross sections, σ cent analyses from GKG18-DPDF [13], HK19-DPDF [18] and the analysis in Ref. [50], used the H1/ZEUS combined datasets in their analyses, however, those studies make no attempt to consider the beneficial effect arising from the inclusion of HT terms.…”

“…The approach used in this investigation is similar to that used by other analysis in literature (see for example Refs. [13,[16][17][18] for clear review).…”

Exclusive and diffractive quarkonium-pair production at the LHC and FCC

“…[30] considering a more recent parameterization for the diffractive gluon distribution, which was obtained in Ref. [32] by fitting the latest HERA data for diffractive ep reactions. Moreover, we will present, for the first time, our predictions for the diffractive double quarkonium production at the energies of the Future Circular Collider (FCC) [33].…”

“…[30], where we have used the fit B obtained by the H1 Collaboration at DESY-HERA [42] several years ago, in what follows we will consider the more recent parameterization obtained in Ref. [32] using the high -precision data from H1/ZEUS combined inclusive diffractive cross sections measurements. We will use the fit A proposed in Ref.…”