Report/Journal Article

PUBDB-2019-02099

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Collinear and TMD parton densities from fits to precision DIS measurements in the parton branching method

Bermudez Martinez, A.DESY* ; Connor, P.DESY* ; Jung, H. (Corresponding author)DESY* ; Lelek, A. ; Žlebčík, R.DESY* ; Hautmann, F. ; Radescu, V.

2019
APS College Park, MD

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Please use a persistent id in citations: doi:10.1103/PhysRevD.99.074008  doi:10.3204/PUBDB-2019-02099

Report No.: DESY-18-042; arXiv:1804.11152

Abstract: 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 $x$, $\mu^2$ and $k_t$, 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 $\alpha_s$. This is taken to be either the evolution scale $\mu$ or the transverse momentum $q_t$. While both choices yield similarly good $\chi^2$ 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.

Keyword(s): parton: density ; gluon: density ; parton: transverse momentum ; collinear ; Z0: transverse momentum ; transverse momentum: momentum spectrum ; scale: renormalization ; higher-order: 1 ; deep inelastic scattering ; CERN LHC Coll ; splitting function ; DGLAP equation ; DESY HERA Stor ; data analysis method ; numerical calculations

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Contributing Institute(s):

1. LHC/CMS Experiment (CMS)

Research Program(s):

1. 611 - Fundamental Particles and Forces (POF3-611) (POF3-611)

Experiment(s):

1. No specific instrument

Appears in the scientific report 2019

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Database coverage:
; ; ; ; Clarivate Analytics Master Journal List ; Current Contents - Physical, Chemical and Earth Sciences ; Ebsco Academic Search ; IF < 5 ; JCR ; Nationallizenz ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Web of Science Core Collection

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Linked articles:

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Preprint/Report Connor, P.DESY* ; Hautmann, F. ; Jung, H. (Corresponding author)DESY* ; Lelek, A.DESY* ; Radescu, V. ; Zlebcik, R.DESY* ; Bermudez Martinez, A.DESY*
Collinear and TMD parton densities from fits to precision DIS measurements in the parton branching method
[10.3204/PUBDB-2018-01961]     Files  Fulltext Fulltext by arXiv.org BibTeX | EndNote: XML, Text | RIS

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