Reconsideration of the inclusive prompt photon production at LHC with kt-factorization

Abstract

We reconsider the inclusive production of isolated prompt photons in $pp$ collisions at the LHC energies in the framework of $k_T$-factorization approach. Our analysis is based on the $\mathcal{O}(\alpha {\alpha }_s)$ off-shell (depending on the transverse momenta of initial quarks and gluons) production amplitudes of $q^{\ast }{g}^{\ast }\to \gamma q$ and $q^{\ast }{\bar{q}}^{\ast }\to \gamma g$ partonic subprocesses and transverse momentum dependent (or unintegrated) quark and gluon densities in a proton, which are chosen in accordance with the Kimber-Martin-Ryskin prescription. We show that the sub-leading high-order $\mathcal{O}(\alpha {\alpha }_s^2)$ contributions, not covered by the non-collinear evolution of parton densities, are important to describe latest LHC data.

arXiv comment13 pages, 7 figures

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• Probing proton intrinsic charm in photon or Z boson production accompanied by heavy jets at LHC
• Prompt photon production in proton collisions as a probe of parton scattering in high energy limit
• Study of isolated prompt photon production in $p$-Pb collisions for the ALICE kinematics
• A detail study of the LHC and TEVATRON hadron-hadron prompt-photon pair production experiments in the angular ordering constraint k_t-factorization approaches
• TMD parton showers for associated $\gamma$+jet production in electron-proton collisions at high energies
• Three-photon productions within the $k_t$-factorization for the ATLAS-LHC data
• TMD parton shower effects in associated $\gamma$ + jet production at LHC
• Probing nuclear modifications of parton distribution functions through the isolated prompt photon production at the LHC
• Predictions for the isolated prompt photon production at the LHC at $\sqrt{s}=$13 TeV
• Inclusive jet and dijet productions using $k_t$ and $(z,k_t)\text{-factorizations}$ versus ZEUS collaboration data
• An energy independent scaling of transverse momentum spectra of direct (prompt) photons from two-body processes in high-energy proton-proton collisions
• $k_T$-factorization approach to the Higgs boson production in $Z{Z}^{\ast }\to 4\ell$ channel at the LHC
• A validity check of the KATIE parton level event generator in the $k_t$-factorization and collinear frameworks
• The P-P(P) cross-section of isolated single-photon production in the $k_t$-factorization and different angular ordering unintegrated parton distributions frameworks
• Numerical Study of MRW-Type Unintegrated Double Parton Distribution Functions from Non-Factorized DPDFs
• Single photon production in ppBar collision in the collinear and kt-factorisation framework and investigation of their differences