Calculations for deep inelastic scattering using fast interpolation grid techniques at NNLO in QCD and the extraction of αs from HERA data

Britzger, D.; Currie, J.; Ridder, A. Gehrmann-De; Gehrmann, T.; Glover, E.W.N.; Gwenlan, C.; Huss, A.; Morgan, T.; Niehues, J.; Pires, J.; Rabbertz, K.; Sutton, M.R.

Abstract

The extension of interpolation-grid frameworks for perturbative QCD calculations at next-to-next-to-leading order (NNLO) is presented for deep inelastic scattering (DIS) processes. A fast and flexible evaluation of higher-order predictions for any a posteriori choice of parton distribution functions (PDFs) or value of the strong coupling constant is essential in iterative fitting procedures to extract PDFs and Standard Model parameters as well as for a detailed study of the scale dependence. The APPLfast project, described here, provides a generic interface between the parton-level Monte Carlo program NNLOjet and both the APPLgrid and fastNLO libraries for the production of interpolation grids at NNLO accuracy. Details of the interface for DIS processes are presented together with the required interpolation grids at NNLO, which are made available. They cover numerous inclusive jet measurements by the H1 and ZEUS experiments at HERA. An extraction of the strong coupling constant is performed as an application of the use of such grids and a best-fit value of αs(MZ)=0.1170(15)exp(25)th is obtained using the HERA inclusive jet cross section data.

Citation

Britzger, D., Currie, J., Ridder, A. G.-D., Gehrmann, T., Glover, E., Gwenlan, C., Huss, A., Morgan, T., Niehues, J., Pires, J., Rabbertz, K., & Sutton, M. (2019). Calculations for deep inelastic scattering using fast interpolation grid techniques at NNLO in QCD and the extraction of αs from HERA data. The European Physical Journal C, 79(10), Article 845. https://doi.org/10.1140/epjc/s10052-019-7351-x

• Journal Article Type: Article
• Acceptance Date: Sep 27, 2019
• Online Publication Date: Oct 14, 2019
• Publication Date: Oct 14, 2019
• Deposit Date: Oct 18, 2019
• Publicly Available Date: Oct 18, 2019
• Journal: European Physical Journal C: Particles and Fields
• Print ISSN: 1434-6044
• Electronic ISSN: 1434-6052
• Publisher: SpringerOpen
• Peer Reviewed: Peer Reviewed
• Volume: 79
• Issue: 10
• Article Number: 845
• DOI: https://doi.org/10.1140/epjc/s10052-019-7351-x
• Public URL: https://durham-repository.worktribe.com/output/1287726