Measurement of Elastic ${\rm Y}$ Photoproduction at HERA

Abstract

The photoproduction reaction gamma p -> mu+ mu- p has been studied in ep interactions using the ZEUS detector at HERA. The data sample corresponds to an integrated luminosity of 43.2 pb^{-1}. The Upsilon meson has been observed in photoproduction for the first time. The sum of the products of the elastic Upsilon(1S), Upsilon(2S), Upsilon(3S) photoproduction cross sections with their respective branching ratios is determined to be 13.3 +- 6.0(stat.)^{+2.7}_{-2.3}(syst.) pb at a mean photon-proton centre of mass energy of 120 GeV. The cross section is above the prediction of a perturbative QCD model.

13 pages including 3 figures

References in corpus (2)

• Diffractive Heavy Quarkonium Photo- and Electroproduction in QCD
• Measurement of Elastic $J/\psi$ Photoproduction at HERA

Cited by in corpus (84)

• Generalized Parton Distributions
• A Large Hadron Electron Collider at CERN: Report on the Physics and Design Concepts for Machine and Detector
• Electron-Ion Collider in China
• STARlight: A Monte Carlo simulation program for ultra-peripheral collisions of relativistic ions
• Measurement of deeply virtual Compton scattering at HERA
• Deeply virtual Compton scattering at small x_B and the access to the GPD H
• Exclusive electroproduction of J/psi mesons at HERA
• Elastic Photoproduction of J/psi and Upsilon Mesons at HERA
• Measurement of Deeply Virtual Compton Scattering at HERA
• Diffractive Electroproduction of rho and phi Mesons at HERA
• Diffractive Vector Meson Production at HERA: from Soft to Hard QCD
• HERA Collider Physics
• Exclusive photoproduction of a heavy vector meson in QCD
• Diffractive photoproduction of $J/\psi$ and ${\rm Y}$ using holographic QCD: gravitational form factors and GPD of gluons in the proton
• Photoproduction of Exotic Baryon Resonances
• Photoproduction of Quarkonium in Proton-Proton and Nucleus-Nucleus Collisions
• Exclusive electroproduction of $\varphi$ mesons at HERA
• Exclusive photoproduction of {\bf ${\rm Y}$} mesons at HERA
• Q^2 dependence of diffractive vector meson electroproduction
• Selected Science Opportunities for the EicC
• Coherent photoproduction of vector mesons in heavy ion ultraperipheral collisions: Update for run 2 at the CERN Large Hadron Collider
• BFKL evolution and the growth with energy of exclusive J/Psi and Upsilon photo-production cross-sections
• Review of proton and nuclear shape fluctuations at high energy
• Measurement of elastic electroproduction of phi mesons at HERA
• Exclusive photoproduction at the Tevatron and LHC within the dipole picture
• Constraining Gluon Shadowing Using Photoproduction in Ultraperipheral pA and AA Collisions
• Measurement of exclusive ${\rm Y}$ photoproduction from protons in pPb collisions at $\sqrt{s_{\mathrm{NN}}}=$ 5.02 TeV
• Measurement of exclusive omega electroproduction at HERA
• QCD evolution based evidence for the onset of gluon saturation in exclusive photo-production of vector mesons
• Exclusive $J/\psi$ and ${\rm Y}$ photoproduction and the low $x$ gluon
• Exclusive photoproduction of Upsilon: from HERA to Tevatron
• Exclusive coherent production of heavy vector mesons in nucleus-nucleus collisions at LHC
• Small x gluon from exclusive J/psi production
• Exclusive ${\rm Y}$ photoproduction in hadronic collisions at CERN LHC energies
• Exclusive J/psi and Upsilon hadroproduction and the QCD odderon
• Upsilon photoproduction at HERA compared to estimates of perturbative QCD
• Diffractive upsilon production at the LHC
• ${\rm Y}$ photo-production on the proton at the Electron-Ion Collider
• Gluon distributions in nuclei probed at the CERN Large Hadron Collider
• Photoproduction of hidden-bottom pentaquark and related topics
• Sub-threshold $J/\psi$ and ${\rm Y}$ Production in $\gamma A$ Collisions
• Exclusive heavy vector meson photoproduction in hadronic collisions at the LHC: predictions of the Color Glass Condensate model for Run 2 energies
• Review of High Energy Diffraction in Real and Virtual Photon Proton scattering at HERA
• Measurement of the t dependence in exclusive photoproduction of Upsilon(1S) mesons at HERA
• Advances in diffraction of subnuclear waves
• Nuclear shadowing from exclusive quarkonium photoproduction at the BNL RHIC and CERN LHC
• Unifying "soft" and "hard" diffractive exclusive vector meson production and deeply virtual Compton scattering
• The BFKL-Regge factorization and $F_2^b$, $F_2^c$, $F_L$ at HERA: physics implications of nodal properties of the BFKL eigenfunctions
• Non-linear QCD dynamics and exclusive production in $ep$ collisions
• Discovery potential for charmonium-like state Y(3940) by the meson photoproduction
• Systematic study on production of hidden-bottom pentaquark via $\gamma p$ and ${\pi }^{-}p$ scatterings
• Photoproduction of pentaquarks states at the LHC
• Exclusive photoproduction of excited quarkonia in ultraperipheral collisions
• Beauty, charm and $F_L$ at HERA: new data vs. early predictions
• Photo- and electro-production of narrow exotic states: from light quarks to charm and up to bottom
• Nonperturbative and perturbative aspects of photo- and electroproduction of vector mesons
• Estimation of ${\rm Y}$(1S) production in ep process near threshold
• Nonperturbative and Perturbative Aspects of Photo- and Electroproduction of Vector Mesons
• High Energy Photoproduction
• Gluon Saturation Effects in Exclusive Heavy Vector Meson Photoproduction
• Exclusive Double Diffractive Events: Menu for LHC
• Exclusive Double Diffractive Events: general framework and prospects
• The total virtual photoabsorption cross section, deeply virtual Compton scattering and vector-meson production
• Probing hidden-bottom pentaquarks in fixed-target collisions at the LHC
• Probing the hidden-bottom pentaquark resonances in photonuclear bottomonium production near threshold: differential observables
• Heavy Flavour Physics at HERA - a Survey
• Diffractive beauty photoproduction as a short distance probe of QCD pomeron
• Scale Dependent Pomeron Intercept in Electromagnetic Diffractive Processes
• Exclusive quarkonium photoproduction: predictions with the Balitsky-Kovchegov equation including the full impact-parameter dependence
• Factorization of the Q^2 dependence in electroproduction of vector mesons
• Hard exclusive production of a vector meson
• Probing Quantum Phenomena through Photoproduction in Relativistic Heavy-Ion Collisions
• Color Evaporation and Elastic ${\rm Y}$ Photoproduction at DESY HERA
• Testing the double-logarithm asymptotic gluon density in ultraperipheral heavy ion collisions at the Large Hadron Collider
• Soft Gluon Approach for Diffractive Photoproduction of J/psi
• From the exclusive photoproduction of heavy quarkonia at HERA to the EDDE at TeVatron and LHC
• Heavy Flavours in Collider Experiments
• Exclusive production of vector mesons in QCD
• Predictions of exclusive ${\rm Y}$ photoproduction at the LHC and future colliders
• A simple model for high-energy nucleon-nucleon elastic diffraction and exclusive diffractive electroproduction of vector mesons on protons
• Probing nuclear structure with the Balitsky-Kovchegov equation in full impact-parameter dependence
• Coherent photoproductions of $J/\Psi$ and ${\rm Y}$ mesons in pp and PbPb ultraperipheral collisions from dynamical gluon distribution
• Diffractive Physics at HERA
• The growth with energy of exclusive $J/\Psi$ and ${\rm Y}$ photo-production cross-sections and BFKL evolution