Coherent $\psi$(2S) photo-production in ultra-peripheral Pb-Pb collisions at ${\sqrt{s}}_{\mathrm{NN}}$ = 2.76 TeV

Abstract

We have has performed the first measurement of the coherent $\psi$(2S) photo-production cross section in ultra-peripheral Pb-Pb collisions at the LHC. This charmonium excited state is reconstructed via the $\psi$(2S) $\to l^{+}{l}^{-}$ and $\psi$(2S) $\to$ J/$\psi {\pi }^{+}{\pi }^{-}$ decays, where the J/$\psi$ decays into two leptons. The analysis is based on an event sample corresponding to an integrated luminosity of about 22 $\mu {\mathrm{b}}^{-1}$. The cross section for coherent $\psi$(2S) production in the rapidity interval $-0.9<y<0.9$ is $\mathrm{d}{\sigma }_{\psi (2S)}^{\mathrm{coh}}/\mathrm{d}y=0.83\pm 0.19(\mathrm{stat}+\mathrm{syst})$ mb. The $\psi$(2S) to J/$\psi$ coherent cross section ratio is $0.34_{-0.07}^{+0.08}(\mathrm{stat}+\mathrm{syst})$. The obtained results are compared to predictions from theoretical models.

22 pages, 5 captioned figures, 3 tables, authors from page 17, published version, figures at http://aliceinfo.cern.ch/ArtSubmission/node/1854

References in corpus (9)

• Parton distributions for the LHC
• EPS09 - a New Generation of NLO and LO Nuclear Parton Distribution Functions
• The Physics of Ultraperipheral Collisions at the LHC
• Determination of nuclear parton distribution functions and their uncertainties at next-to-leading order
• Observation of exclusive charmonium production and gamma+gamma to mu+mu- in p+pbar collisions at sqrt{s} = 1.96 TeV
• J/Psi production in ultraperipheral Pb+Pb and p+Pb collisions at energies available at the CERN Large Hadron Collider
• Vector Meson Production in Coherent Hadronic Interactions: An update on predictions for RHIC and LHC
• Small x gluon from exclusive J/psi production
• Asymmetric Statistical Errors

Cited by in corpus (35)

• STARlight: A Monte Carlo simulation program for ultra-peripheral collisions of relativistic ions
• Coherent J/$\psi$ photoproduction at forward rapidity in ultra-peripheral Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV
• Coherent photoproduction of vector mesons in heavy ion ultraperipheral collisions: Update for run 2 at the CERN Large Hadron Collider
• On the one loop ${\gamma }^{(\ast )}\to q\bar{q}$ impact factor and the exclusive diffractive cross sections for the production of two or three jets
• Observation of centrality-dependent acoplanarity for muon pairs produced via two-photon scattering in Pb+Pb collisions at $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV with the ATLAS detector
• Heavy-ion collisions at the Large Hadron Collider: a review of the results from Run 1
• First measurement of the $|\text{t}|$-dependence of coherent $J/\psi$ photonuclear production
• Coherent $J/\psi$ and ${\psi }^{\prime }$ photoproduction at midrapidity in ultra-peripheral Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV
• The Present and Future of QCD
• A generator of forward neutrons for ultra-peripheral collisions: $\textbf{n$\mathbf{_O^O}$n}$
• Investigating saturation effects in ultraperipheral collisions at the LHC with the color dipole model
• Inclusive dijet photoproduction in ultraperipheral heavy-ion collisions at the CERN LHC in next-to-leading order QCD
• Diffractive charmonium spectrum in high energy collisions in the basis light-front quantization approach
• Diffractive dijet photoproduction in ultraperipheral collisions at the LHC in next-to-leading order QCD
• Selected topics in diffraction with protons and nuclei: past, present, and future
• Light-front wavefunctions of mesons by design
• Prospects for quarkonium studies at the high-luminosity LHC
• Exclusive photoproduction of excited quarkonia in ultraperipheral collisions
• Photoproduction of heavy vector mesons in ultra-peripheral Pb-Pb collisions
• Charmonium production in ultra-peripheral heavy ion collisions with two-photon processes
• Single-Transverse-Spin Asymmetries in Exclusive Photo-production of J/psi in Ultra-Peripheral Collisions in the Fixed-Target Mode at the LHC and in the Collider Mode at RHIC
• Incoherent vector mesons production in PbPb ultraperipheral collisions at the LHC
• Nuclear dependence of the transverse-single-spin asymmetry for forward neutron production in polarized $p$$+$$A$ collisions at $\sqrt{s_{{}_{NN}}}=200$ GeV
• Exclusive photoproduction of vector mesons in proton-lead ultraperipheral collisions at the LHC
• Momentum transfer squared dependence of exclusive quarkonia photoproduction in UPCs
• Photoproduction of vector mesons in proton-proton ultraperipheral collisions at the CERN Large Hadron Collider
• D-wave effects in heavy quarkonium production in ultraperipheral nuclear collisions
• New opportunities at the photon energy frontier
• Vector meson photoproduction in UPCs with FoCal
• Coherent photo- and electroproduction of charmonia on nuclear targets revisited: Green function formalism
• Coherent photoproduction of light vector mesons off nuclear targets in the dipole picture
• Charmonium spectrum and diffractive production in a light-front Hamiltonian approach
• The reggeometric pomeron and exclusive production of $J/\psi$ and $\psi (2S)$ in ultraperipheral collisions at the LHC
• Photon-hadron and photon-photon collisions in ALICE
• Small-x, Diffraction and Vector Mesons