Three-photon productions within the $k_t$-factorization for the ATLAS-LHC data

Abstract

Recently, the ATLAS data of isolated three-photon production showed that the next-to-leading order (NLO) collinear factorization is not enough to describe experimental data. Therefore, one needs to calculate the cross section beyond the NLO, and as showed later, these data can be well described by the NNLO calculation within the collinear factorization framework. However, it is shown that the $k_t$-factorization can be quite successful in describing exclusive and high energy collision processes, henceforth we decided to calculate isolated three-photon production within this framework. In this work we use the Martin, Ryskin, and Watt unintegrated parton distribution functions (MRW UPDFs) at LO and NLO levels, in addition to parton branching (PB) UPDFs in order to calculate cross section which we utilize the KATIE parton level event generator. It will be shown that in contrast to collinear factorization, the $k_t$-factorization can describe quiet well the three-photon production ATLAS data. Interestingly our results using the NLO-MRW and PB UPDFs can cover the data within their uncertainty bands, similar to the NNLO collinear results.

References in corpus (32)

• LHAPDF6: parton density access in the LHC precision era
• Parton distributions from high-precision collider data
• New parton distribution functions from a global analysis of quantum chromodynamics
• Parton distributions in the LHC era: MMHT 2014 PDFs
• Isolated photons in perturbative QCD
• Unintegrated parton distributions
• Unintegrated parton distributions and inclusive jet production at HERA
• Small x Phenomenology: Summary and Status
• NLO prescription for unintegrated parton distributions
• Soft-gluon resolution scale in QCD evolution equations
• Collinear and TMD parton densities from fits to precision DIS measurements in the parton branching method
• Forward Jet Production at the Large Hadron Collider
• TMDlib and TMDplotter: library and plotting tools for transverse-momentum-dependent parton distributions
• Triphoton production at hadron colliders in NNLO QCD
• NNLO QCD corrections to three-photon production at the LHC
• Small x Phenomenology - summary of the 3rd Lund Small x Workshop in 2004
• Collinear and TMD Quark and Gluon Densities from Parton Branching Solution of QCD Evolution Equations
• Dynamical resolution scale in transverse momentum distributions at the LHC
• Forward Jets and Energy Flow in Hadronic Collisions
• On the use of the KMR unintegrated parton distribution functions
• Measurement of the production cross section of three isolated photons in $pp$ collisions at $\sqrt{s}$ = 8 TeV using the ATLAS detector
• Consistent treatment of charm production in higher-orders at tree-level within $k_T$-factorization approach
• Calculations with off-shell matrix elements, TMD parton densities and TMD parton showers
• Particle Event Generator: A Simple-in-Use System PEGASUS version 1.0
• Diphoton production at Tevatron and the LHC in the NLO* approximation of the Parton Reggeization Approach
• The general behavior of $NLO$ unintegrated parton distributions based on the single-scale evolution and the angular ordering constraint
• Reconsideration of the inclusive prompt photon production at LHC with kt-factorization
• LHC production of forward-center and forward-forward di-jets in the $k_t$-factorization $unintegrated$ parton distribution frameworks
• $KMR$ $k_t$-factorization procedure for the description of the $LHCb$ forward hadron-hadron $Z^0$ production at $\sqrt{s}=13TeV$
• A detail study of the LHC and TEVATRON hadron-hadron prompt-photon pair production experiments in the angular ordering constraint k_t-factorization approaches
• Inclusive jet and dijet productions using $k_t$ and $(z,k_t)\text{-factorizations}$ versus ZEUS collaboration data
• The P-P(P) cross-section of isolated single-photon production in the $k_t$-factorization and different angular ordering unintegrated parton distributions frameworks

Cited by in corpus (5)

• Two-Loop QCD Corrections for Three-Photon Production at Hadron Colliders
• On the ambiguity between differential and integral forms of the Martin-Ryskin-Watt unintegrated parton distribution function model
• Production of three isolated photons in the parton Reggeization approach at high energies
• On validity of different PDFs sets using the proton $k_t$-factorization structure functions and the Gaussian $k_t$-dependence of KMR UPDFs
• Numerical Study of MRW-Type Unintegrated Double Parton Distribution Functions from Non-Factorized DPDFs