Journal Article/Internal Report

PUBDB-2014-04204

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png TMD parton densities in associated real and virtual photon and jet production at LHC

Lipatov, A. (Corresponding Author)Extern* ; Zotov, N.Extern*

2014
Soc. [S.l.]

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Please use a persistent id in citations: doi:10.1103/PhysRevD.90.094005

Report No.: DESY-14-197; arXiv:1409.0514

Abstract: We study the associated production of real (isolated) or virtual photons (with their subsequent leptonic decay) and hadronic jets in proton-proton collisions at the LHC using the ${k}_{T}$-factorization approach of QCD. The consideration is based on the off-shell quark-gluon QCD Compton scattering subprocesses. In the case of virtual photon production, the contributions from $Z$ boson exchange as well as ${\gamma }^{*}-Z$ interference with the full spin correlations are included. The transversemomentum-dependent (TMD) quark and gluon densities in a proton are determined from the Kimber-Martin-Ryskin prescription or Catani-Ciafoloni-Fiorani-Marchesini (CCFM) equation. In the latter, we restrict to the case where the gluon-to-quark splitting occurs at the last evolution step and calculate the sea quark density as a convolution of the CCFM-evolved gluon distribution and the TMD gluon-to-quark splitting function. Our numerical predictions are compared with the recent experimental data taken by the ATLAS Collaboration. We discuss the theoretical uncertainties of our calculations and argue that further studies are capable of constraining the TMD parton densities in the proton.

Keyword(s): photon: virtual ; parton: density ; gluon: density ; quark: density ; photon: production ; jet: production ; spin: correlation ; jet: hadronic ; Z0: exchange ; quark: sea ; transverse momentum: factorization ; p p: scattering ; transverse momentum dependence ; quantum chromodynamics ; CERN LHC Coll ; associated production ; evolution equation ; Compton scattering ; splitting function ; leptonic decay ; CCFM equation ; interference ; quark gluon ; splitting ; off-shell ; ATLAS

Note: OA

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Contributing Institute(s):

1. LHC/CMS Experiment (CMS)

Research Program(s):

1. Experiments at LHC (CMS) (POF2-512) (POF2-512)

Experiment(s):

1. LHC: CMS

Appears in the scientific report 2014

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

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