Exploring minijets beyond the leading power

Abstract

The crucial parameter of the current Monte Carlo models of high energy hadron-hadron interaction is the transverse momentum cutoff $p_{T0}$ for parton-parton interactions which slowly grows with energy and regularizes the cross section. This modification of the collinear factorization formula goes beyond the leading power and thus a natural question arises if such cutoff can be extracted from a formalism which takes into account power corrections. In this work, we consider the High Energy Factorization (HEF) valid at small $x$ and a new model, based on a similar principle to HEF, which in addition has a limit respecting the Dokshitzer-Dyakonov-Troyan formula for the dijet momentum disbalance spectrum. Minijet cross section and its suppression is then analyzed in two ways. First, we study minijets directly in the low-$p_T$ region, and demonstrate that higher twist corrections do generate suppression of the inclusive jet production cross section though these effects are not leading to the increase of the cutoff with incident energy. Second, we consider hard inclusive dijet production where Multi Parton Interactions (MPIs) with minijets produce power corrections. We introduce an observable constructed from differential cross section in the ratio $\tau$ of dijet disbalance to the average dijet $p_T$ and demonstrate that the $\tau >1$ region is sensitive to the cutoff $p_{T0}$ in the MPI minijet models. The energy dependence of the cutoff is reflected in the energy dependence of the bimodality coefficient $b$ of the $\tau$ distribution. We compare $b$ calculated from $\mathsf{pythia}$, where one can conveniently control MPIs by the program parameters, and HEF for a few unintegrated gluon distributions (UGDs). We find that the energy dependence of $b$ is very sensitive to the particular choice of UGD and in some models it resembles predictions of the Monte Carlo models.

35 pages, 15 figures

References in corpus (67)

• PYTHIA 6.4 Physics and Manual
• PYTHIA 6.2 Physics and Manual
• Herwig++ Physics and Manual
• Operator expansion for high-energy scattering
• Direct Proof Of Tree-Level Recursion Relation In Yang-Mills Theory
• Small-x F_2 Structure Function of a Nucleus Including Multiple Pomeron Exchanges
• New Recursion Relations for Tree Amplitudes of Gluons
• Multi-Parton Amplitudes in Gauge Theories
• JaxoDraw: A graphical user interface for drawing Feynman diagrams
• QCD Factorization for Semi-Inclusive Deep-Inelastic Scattering at Low Transverse Momentum
• Unintegrated parton distributions
• High-Energy Factorization and Small-X Deep Inelastic Scattering Beyond Leading Order
• Gauge invariant effective action for high-energy processes in QCD
• The Color Glass Condensate and hadron production in the forward region
• Hard-scattering factorization with heavy quarks: A general treatment
• High energy pA collisions in the color glass condensate approach I. Gluon production and the Cronin effect
• No Generalized TMD-Factorization in the Hadro-Production of High Transverse Momentum Hadrons
• A unified BFKL and GLAP description of $F_2$ data
• Elements of a theory for multiparton interactions in QCD
• Feynman rules for effective Regge action
• The four jet production at LHC and Tevatron in QCD
• Improved TMD factorization for forward dijet production in dilute-dense hadronic collisions
• Unintegrated parton distributions and prompt photon hadroproduction
• Constraining MPI models using sigma_effective and recent Tevatron and LHC Underlying Event data
• Gluon saturation in dijet production in p-Pb collisions at Large Hadron Collider
• Forward di-jet production in p+Pb collisions in the small-x improved TMD factorization framework
• Forward Jet Production at the Large Hadron Collider
• TMDlib and TMDplotter: library and plotting tools for transverse-momentum-dependent parton distributions
• Open charm production at the LHC - $k_t$-factorization approach
• Helicity amplitudes for high-energy scattering
• Cancellation of Glauber gluon exchange in the double Drell-Yan process
• Dijet azimuthal decorrelations at the LHC in the parton Reggeization approach
• QCD factorization of exclusive processes beyond leading twist: gamma*T -> rhoT impact factor with twist three accuracy
• Operator product expansion in QCD in off-forward kinematics: Separation of kinematic and dynamical contributions
• Scattering amplitudes with off-shell quarks
• Multi-gluon helicity amplitudes with one off-shell leg within high energy factorization
• The CCFM uPDF evolution uPDFevolv
• Transverse Momentum Resummation for Dijet Correlation in Hadronic Collisions
• Foam: A General-Purpose Cellular Monte Carlo Event Generator
• The Linked Dipole Chain Monte Carlo
• Forward Jets and Energy Flow in Hadronic Collisions
• Production of $c\bar{c}c\bar{c}$ in double-parton scattering within $k_t$-factorization approach -- meson-meson correlations
• Small-$x$ dynamics in forward-central dijet decorrelations at the LHC
• Gluon splitting in a shockwave
• Wilson lines and gauge invariant off-shell amplitudes
• Four-jet production in single- and double-parton scattering within high-energy factorization
• BCFW recursion for off-shell gluons
• Saturation effects in forward-forward dijet production in p+Pb collisions
• Hadronic Total Cross-sections Through Soft Gluon Summation in Impact Parameter Space
• Single jet and prompt-photon inclusive production with multi-Regge kinematics: From Tevatron to LHC
• Resummation effects in forward production of Z0+jet at LHC
• Angular and momentum asymmetry in particle production at high energies
• Unitarity Constraints on Semi-hard Jet Production in Impact Parameter Space
• Multiple Hard Partonic Collisions with Correlations in Proton-Proton Scattering
• Inclusive b-jet and b\bar b-dijet production at the LHC via Reggeized gluons
• Diphoton production at Tevatron in the quasi-multi-Regge-kinematics approach
• BCFW recursion for TMD parton scattering
• Underlying event characteristics and their dependence on jet size of charged-particle jet events in pp collisions at sqrt(s) = 7 TeV with the ATLAS detector
• Central exclusive quark-antiquark dijet and Standard Model Higgs boson production in proton-(anti)proton collisions
• Single and double inclusive forward jet production at the LHC at $\sqrt{s}$ = 7 and 13 TeV
• Recursion relations for multi-gluon off-shell amplitudes on the light-front and Wilson lines
• Three jet production and gluon saturation effects in p-p and p-Pb collisions within high-energy factorization
• Hadronic Collisions in the Linked Dipole Chain Model
• General Mass Scheme for Jet Production in DIS
• Off-shell amplitudes as boundary integrals of analytically continued Wilson line slope
• Minijets and Transverse Energy Flow in High Energy Collisions
• Unintegrated gluon distributions for forward jets at LHC

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