Volume 508 - QCD at the Extremes (QCDEX2025) - Session: Parton Densities and TMDs at low scales, including saturation and recombination.
An investigation of different unintegrated parton distribution functions
Z.Β Badieian* and M.Β Modarres
*: corresponding author
Full text: pdf
Pre-published on: November 19, 2025
Published on: β€”
Abstract
We investigate unintegrated parton distribution functions (UPDFs) by using the KimberMartin-
Ryskin (KMR) and leading-order MartinRyskinWatt (LOMRW) methods and compare them with
trans- verse momentum dependent PDFs from the parton branching (PB) approach. The UPDFs
are computed for various partons over a range π‘₯, πœ‡2, and π‘˜π‘‘ , revealing that all methods yield
similar results at small values of π‘˜π‘‘ , while at higher π‘˜π‘‘ , the LOMRW UPDFs remain larger and
the PB distributions decrease more rapidly. We then compute the reduced cross section (RCS) in
deep inelastic scattering at 𝑄2 = 4.5 and 12𝐺𝑒𝑉2, finding that KMR and LOMRW predictions
are consistent with PB results and experimental data at mid-π‘₯, though they overestimate the data
at small π‘₯ due to omission of the longitudinal structure function 𝐹𝐿.
DOI: https://doi.org/10.22323/1.508.0014
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