GRANIITTI: A Monte Carlo Event Generator for High Energy Diffraction

Abstract

We describe the physics and computational power of GRANIITTI Monte Carlo event generator, a new fully multithreaded engine designed for high energy diffraction, written in modern C++. The emphasis is especially on the low-mass domain of central exclusive processes of the S-matrix, where exotic QCD phenomena such as glueballs are expected and holographic dualities with gravity may be tested. The generator includes photon-photon, photon-pomeron, pomeron-pomeron, Durham QCD model and Tensor pomeron model type scattering amplitudes and advanced spin analysis tools. The generator combines a full parametric resonance spectrum with continuum interference and forward + central spin correlations together with event-by-event eikonal screening loop and forward proton excitation kinematics. We demonstrate the state-of-the-art capabilities and show how the enigmatic `glueball filter' observable is driven by spin polarization.

arXiv comment81 pages, 25 figures, v2: minor modifications

References in corpus (29)

• A Brief Introduction to PYTHIA 8.1
• LHAPDF6: parton density access in the LHC precision era
• Saturation Effects in Deep Inelastic Scattering at low $Q^2$ and its Implications on Diffraction
• The Pomeron and Gauge/String Duality
• Event-by-event gluon multiplicity, energy density and eccentricities at RHIC and LHC
• STARlight: A Monte Carlo simulation program for ultra-peripheral collisions of relativistic ions
• A Portable High-Quality Random Number Generator for Lattice Field Theory Simulations
• Measurement of inelastic, single- and double-diffraction cross sections in proton-proton collisions at the LHC with ALICE
• Evidence of strong proton shape fluctuations from incoherent diffraction
• Strings, Black Holes and Lorentz Contraction
• Soft diffraction and the elastic slope at Tevatron and LHC energies: a multi-Pomeron approach
• Proton structure function at small Q^2
• Central exclusive diffractive production as a spin--parity analyser: from hadrons to Higgs
• Observation of Exclusive Electron-Positron Production in Hadron-Hadron Collisions
• A Glueball- $q\bar{q}$ Filter in Central Hadron Production
• Measurement of diffraction dissociation cross sections in pp collisions at sqrt(s) = 7 TeV
• Measurement of the exclusive $\gamma \gamma \to {\mu }^{+}{\mu }^{-}$ process in proton--proton collisions at $\sqrt{s}=13$ TeV with the ATLAS detector
• Measurement of exclusive $\gamma \gamma \to {\ell }^{+}{\ell }^{-}$ production in proton-proton collisions at $\sqrt{s}=7$ TeV with the ATLAS detector
• Exclusive $pp\to pp{\pi }^{+}{\pi }^{-}$ reaction: from the threshold to LHC
• Central exclusive diffractive production of ${\pi }^{+}{\pi }^{-}$ continuum, scalar and tensor resonances in $pp$ and $p\bar{p}$ scattering within tensor pomeron approach
• Central Exclusive Production in QCD
• Modeling exclusive meson pair production at hadron colliders
• A simple form for the low-x generalized parton distributions in the skewed regime
• Observation of Exclusive Gamma Gamma Production in p pbar Collisions at sqrt{s}=1.96 TeV
• Longitudinal structure function from logarithmic slopes of $F_2$ at low $x$
• Pomeron Interactions from the Einstein-Hilbert Action
• Central Diffraction in ALICE
• Exclusive diffractive resonance production in proton-proton collisions at high energies
• DeepEfficiency - optimal efficiency inversion in higher dimensions at the LHC