TY  - JOUR
AU  - Lipatov, Artem
AU  - Zotov, Nikolai
TI  - TMD parton densities in associated real and virtual photon and jet production at LHC
JO  - Physical review / D
VL  - 90
IS  - 9
SN  - 1550-7998
CY  - [S.l.]
PB  - Soc.
M1  - PUBDB-2014-04204
M1  - DESY-14-197
M1  - arXiv:1409.0514
SP  - 094005
PY  - 2014
N1  - OA
AB  - 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<sub>T</sub>-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 γ<sup>*</sup>−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.
KW  - photon: virtual (autogen)
KW  - parton: density (autogen)
KW  - gluon: density (autogen)
KW  - quark: density (autogen)
KW  - photon: production (autogen)
KW  - jet: production (autogen)
KW  - spin: correlation (autogen)
KW  - jet: hadronic (autogen)
KW  - Z0: exchange (autogen)
KW  - quark: sea (autogen)
KW  - transverse momentum: factorization (autogen)
KW  - p p: scattering (autogen)
KW  - transverse momentum dependence (autogen)
KW  - quantum chromodynamics (autogen)
KW  - CERN LHC Coll (autogen)
KW  - associated production (autogen)
KW  - evolution equation (autogen)
KW  - Compton scattering (autogen)
KW  - splitting function (autogen)
KW  - leptonic decay (autogen)
KW  - CCFM equation (autogen)
KW  - interference (autogen)
KW  - quark gluon (autogen)
KW  - splitting (autogen)
KW  - off-shell (autogen)
KW  - ATLAS (autogen)
LB  - PUB:(DE-HGF)16 ; PUB:(DE-HGF)15
DO  - DOI:10.1103/PhysRevD.90.094005
UR  - https://bib-pubdb1.desy.de/record/192622
ER  -