TY  - JOUR
AU  - Bermudez Martinez, A.
AU  - Connor, P.
AU  - Jung, H.
AU  - Lelek, A.
AU  - Žlebčík, R.
AU  - Hautmann, F.
AU  - Radescu, V.
TI  - Collinear and TMD parton densities from fits to precision DIS measurements in the parton branching method
JO  - Physical review / D
VL  - 99
IS  - 7
SN  - 2470-0010
CY  - College Park, MD
PB  - APS
M1  - PUBDB-2019-02099
M1  - arXiv:1804.11152
M1  - DESY-18-042
SP  - 074008
PY  - 2019
AB  - Collinear and transverse momentum dependent (TMD) parton densities are obtained from fits to precision measurements of deep inelastic scattering (DIS) cross sections at HERA. The parton densities are evolved by DGLAP evolution with next-to-leading-order (NLO) splitting functions using the parton branching method, allowing one to determine simultaneously collinear and TMD densities for all flavors over a wide range in x, μ<sup>2</sup> and k<sub>t</sub>, relevant for predictions at the LHC. The DIS cross section is computed from the parton densities using perturbative NLO coefficient functions. Parton densities satisfying angular ordering conditions are presented. Two sets of parton densities are obtained, differing in the renormalization scale choice for the argument in the strong coupling α<sub>s</sub>. This is taken to be either the evolution scale μ or the transverse momentum q<sub>t</sub>. While both choices yield similarly good χ<sup>2</sup> values for the fit to DIS measurements, especially the gluon density turns out to differ between the two sets. The TMD densities are used to predict the transverse momentum spectrum of Z-bosons at the LHC.
KW  - parton: density (INSPIRE)
KW  - gluon: density (INSPIRE)
KW  - parton: transverse momentum (INSPIRE)
KW  - collinear (INSPIRE)
KW  - Z0: transverse momentum (INSPIRE)
KW  - transverse momentum: momentum spectrum (INSPIRE)
KW  - scale: renormalization (INSPIRE)
KW  - higher-order: 1 (INSPIRE)
KW  - deep inelastic scattering (INSPIRE)
KW  - CERN LHC Coll (INSPIRE)
KW  - splitting function (INSPIRE)
KW  - DGLAP equation (INSPIRE)
KW  - DESY HERA Stor (INSPIRE)
KW  - data analysis method (INSPIRE)
KW  - numerical calculations (INSPIRE)
LB  - PUB:(DE-HGF)29 ; PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000464740700005
DO  - DOI:10.1103/PhysRevD.99.074008
UR  - https://bib-pubdb1.desy.de/record/421688
ER  -