Preprint

PUBDB-2025-02016

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png A novel phenomenological approach to total cross-section measurements at the LHC

Yang, Y.DESY* ; Geiser, A. (Corresponding author)DESY* ; Moch, S.-O.Extern* ; Zenaiev, O.Extern*

2025

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Please use a persistent id in citations: doi:10.3204/PUBDB-2025-02016

Report No.: DESY-25-091; arXiv:2506.22616

Abstract: We propose a novel, data-driven method for determining total charm cross sections in proton-proton collisions by extrapolating measured fiducial cross sections without assuming any particular fragmentation model. In this way, the method accounts for the recently observed charm fragmentation non-universality at the LHC through a data-driven extrapolation function called ddFONLL. Applied to $D^0$ production at 5 and 13 TeV, this approach yields total charm cross sections that fully incorporate fragmentation non-universality. The results, which differ significantly from previous universality-based estimates, are consistent with NNLO QCD predictions and enable direct comparisons free from fragmentation assumptions. We use this to evaluate the sensitivity of total cross-section measurements to parton distribution functions and the charm-quark mass. An outlook is given on the potential of further expanding the use of the ddFONLL method.

Note: This is *not* a CMS paper, but a phenomenology paper

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Contributing Institute(s):

1. Uni Hamburg / Theorie (UNI/TH)
2. LHC/CMS Experiment (CMS)

Research Program(s):

1. 611 - Fundamental Particles and Forces (POF4-611) (POF4-611)
2. MSCA4Ukraine - MSCA4Ukraine (101101923) (101101923)

Experiment(s):

1. No specific instrument

Appears in the scientific report 2025

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