Abstract
We investigate associated prompt photon and hadronic jet production at the LHC energies using the $k_T$-factorization approach. Our consideration is based on the $\mathcal O(\alpha\alpha_s^2)$ off-shell gluon-gluon fusion subprocess $g^*g^*\to \gamma q\bar q$ and several subleading quark-initiated contributions from $\mathcal O(\alpha\alpha_s)$ and $\mathcal O(\alpha\alpha_s^2)$ subprocesses, taken into account in the conventional (collinear) QCD factorization. The transverse momentum dependent (or unintegrated) gluon densities in a proton are derived from Catani-Ciafaloni-Fiorani-Marchesini (CCFM) evolution equation. We achieve reasonably good agreement with the experimental data taken by CMS and ATLAS Collaborations and demonstrate the importance of initial state parton showers for jet determination in the $k_T$-factorization approach.
Highlights
Investigation of prompt photon and associated hadronic jet production is an important topic of modern experimental and theoretical research [1,2,3,4,5,6]
Our consideration is based on the Oðαα2s Þ off-shell gluon-gluon fusion subprocess gÃgà → γqqand several subleading quark-initiated contributions from OðααsÞ and Oðαα2sÞ subprocesses, taken into account in the conventional QCD factorization
We have considered associated production of prompt photon and hadronic jets at LHC conditions
Summary
Investigation of prompt photon and associated hadronic jet production is an important topic of modern experimental and theoretical research [1,2,3,4,5,6]. The photons are called prompt if they originate from the hard partonic subprocess, rather than from secondary decays. Such events provide a direct probe of the hard subprocess dynamics since the produced photons are largely insensitive to the effects of final-state hadronization. The measured γ þ jet total and differential cross sections are sensitive to the quark and gluon densities in the proton over the whole kinematical region of longitudinal momentum fraction x and hard scale μ2 and represent an important background to many processes involving photons in the final state, including Higgs boson production (in the diphoton decay mode).
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