Elastic and Inelastic Photoproduction of \jpsi Mesons at HERA

Abstract

Results on \jpsi production in $ep$ interactionsin the H1 experiment at HERA are presented. The \jpsi mesons are produced by almost real photons ($Q^2\approx 0$) and detected via their leptonic decays. The data have been taken in 1994 and correspond to an integrated luminosity of $2.7{pb}^{-1}$. The $\gamma p$ cross section for elastic \jpsi production is observed to increase strongly with the \cm energy. The cross section for diffractive $J/\psi$ production with proton dissociation is found to be of similar magnitude as the elastic cross section. Distributions of transverse momentum and decay angle are studied and found to be in accord with a diffractive production mechanism. For inelastic \jpsi production the total $\gamma p$ cross section, the distribution of transverse momenta, and the elasticity of the \jpsi are compared to NLO QCD calculations in a colour singlet model and agreement is found. Diffractive \psiprime production has been observed and a first estimate of the ratio to \jpsi production in the HERA energy regime is given.

27 pages, latex, 9 Figures appended as uuencoded file, figure 8b replaced

References in corpus (9)

• Total cross sections
• Pinning down the Glue in the Proton
• A Measurement of the Proton Structure Function $F_2(x,Q^2)$
• QCD Corrections to Inelastic $J/\psi$ Photoproduction
• Measurement of the Cross Section for the Reaction $γp \to \jpsi~p$ with the ZEUS Detector at HERA
• Exclusive vector meson production at HERA
• Inelastic J/psi Photoproduction
• Measurement of the Total Photon Proton Cross Section and its Decomposition at 200~GeV Centre of Mass Energy
• The Two Pomerons

Cited by in corpus (66)

• Generalized Parton Distributions
• NLO Production and Decay of Quarkonium
• Elastic J/Psi Production at HERA
• Small x: Two Pomerons!
• Elastic Photoproduction of J/psi and Upsilon Mesons at HERA
• New Observables in Inclusive Production of Quarkonia
• Diffractive Vector Meson Production at HERA: from Soft to Hard QCD
• HERA Collider Physics
• Exclusive photoproduction of a heavy vector meson in QCD
• Measurement of Elastic ${\rm Y}$ Photoproduction at HERA
• Excitation functions of hadronic observables from SIS to RHIC energies
• Photoproduction of Exotic Baryon Resonances
• Diffractive Photoproduction of Psi(2S) Mesons at HERA
• The Hadronic Final State at HERA
• Inelastic Production of J/psi Mesons in Photoproduction and Deep Inelastic Scattering at HERA
• Further success of the colour dipole model
• Quarkonium Photoproduction at Next-to-leading Order
• Scale Anomaly and "Soft" Pomeron in QCD
• Central exclusive chi_c meson production at the Tevatron revisited
• Exclusive $J/\psi$ and ${\rm Y}$ photoproduction and the low $x$ gluon
• J/psi Inclusive Production in ep Deep-Inelastic Scattering at DESY HERA
• Non-linear evolution and parton distributions at LHC and THERA energies
• J/ΨN and Psi' N total cross sections from photoproduction data: failure of vector dominance
• The QCD description of diffractive processes
• Inelastic J/psi and Upsilon hadroproduction
• J/psi production at the Tevatron and HERA: the effect of k_T smearing
• Large-P_T inclusive photoproduction of J/psi in electron-proton collisions at HERA and the EIC
• A Pomeron Approach to Hadron-Nucleus and Nucleus-Nucleus "Soft" Interactions at High Energy
• Photo-production of psi' Mesons at HERA
• Color-Octet Contributions to J/psi Photoproduction via Fragmentation at HERA
• eta_c Production at the Tevatron: A test of NRQCD
• Selected topics in diffraction with protons and nuclei: past, present, and future
• Revisiting NLO QCD corrections to total inclusive J/psi and Upsilon photoproduction cross sections in lepton-proton collisions
• Photo-production of Bound States with Hidden Charms
• The extraction of the bare triple-Pomeron vertex; a crucial ingredient for diffraction
• Heavy quarkonium production in double Pomeron exchange processes in perturbative QCD
• Fermi Motion and Quark Off-Shellness in Elastic Vector-Meson Production
• Production of $J/\Psi$ on the nucleon and deuteron targets
• Measurement of the Charm Production Cross Section in gamma gamma Collisions at LEP
• Systematic study on production of hidden-bottom pentaquark via $\gamma p$ and ${\pi }^{-}p$ scatterings
• Deep inelastic $J/\psi$ production at HERA in the $k_T$-factorization approach and its consequences for the nonrelativistic QCD
• Evidence for no shrinkage in elastic photoproduction of J/Psi
• The Color Evaporation Model in Diffractive $J/\psi$ Photoproduction
• Identify the hidden charm pentaquark signal from non-resonant background in electron-proton scattering
• The H1 Forward Proton Spectrometer at HERA
• Estimation of ${\rm Y}$(1S) production in ep process near threshold
• Behaviour of the forward peak in hard diffractive leptoproduction of vector mesons
• Photoproduction of fully charmed tetraquark at electron-ion colliders
• Inelastic Photoproduction at HERA: a Second Charmonium Crisis?
• Diffractive Photoproduction of Eta_c
• Exclusive Double Diffractive Events: Menu for LHC
• Exploring Baryon Resonances with Transition Generalized Parton Distributions: Status and Perspectives
• Constraining the free parameter of the high parton density effects
• Hadron Collider Tests of Neutrino Mass-Generating Mechanisms
• Color Dipole Systematics of the Diffraction Slope in Diffractive Photo- and Electroproduction of Vector Mesons
• Deep Inelastic Scattering at HERA
• Probing Quantum Phenomena through Photoproduction in Relativistic Heavy-Ion Collisions
• From the exclusive photoproduction of heavy quarkonia at HERA to the EDDE at TeVatron and LHC
• Soft Gluon Approach for Diffractive Photoproduction of J/psi
• Physics with high-luminosity proton-nucleus collisions at the LHC
• Revisit prompt $J/\psi$ production in associated with Higgs Boson via gluon fusion at the LHC
• Heavy-Flavour Production at HERA
• Inclusive photoproduction of vector quarkonium in ultra-peripheral collisions at the LHC
• Parton Propagation in a Gluon Field
• An Investigation of the Hard Contribution to phi Photoproduction
• Coherent photoproductions of $J/\Psi$ and ${\rm Y}$ mesons in pp and PbPb ultraperipheral collisions from dynamical gluon distribution