Exclusive $J/\psi$ and $\psi(2S)$ production in $pp$ collisions at $\sqrt{s}=7$ TeV
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A. Martín Sánchez
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S. Redford
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M. M. Reid
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A. C. Dos Reis
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S. Ricciardi
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A. Richards
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K. Rinnert
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V. Rives Molina
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Diego Alejandro Roa Romero
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E. Rodrigues
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P. Rodriguez Perez
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G. J. Rogers
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S. Roiser
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V. Romanovsky
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A. Romero Vidal
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J. Rouvinet
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T. Ruf
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H. Ruiz
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G. Sabatino
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J. J. Saborido Silva
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N. Sagidova
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P. Sail
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B. Saitta
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C. Salzmann
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B. Sanmartin Sedes
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M. Sannino
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C. Santamarina Rios
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A. Sarti
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- IdHAL : alessandro-sarti
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C. Satriano
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A. Satta
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M. Savrie
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D. Savrina
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P. Schaack
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M. Schiller
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H. Schindler
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S. Schleich
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M. Schlupp
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M. Schmelling
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B. Schmidt
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O. Schneider
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A. Schopper
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R. Schwemmer
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B. Sciascia
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A. Sciubba
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M. Seco
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A. Semennikov
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K. Senderowska
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I. Sepp
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N. Serra
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J. Serrano
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P. Seyfert
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M. Shapkin
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I. Shapoval
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P. Shatalov
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Y. Shcheglov
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T. Shears
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L. Shekhtman
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O. Shevchenko
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A. Shires
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T. Skwarnicki
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N. A. Smith
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M. Smith
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M. D. Sokoloff
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F. J. P. Soler
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F. Soomro
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D. Souza
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B. Souza de Paula
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B. Spaan
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A. Sparkes
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P. Spradlin
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F. Stagni
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S. Stahl
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O. Steinkamp
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S. Stoica
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S. Stone
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B. Storaci
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M. Straticiuc
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U. Straumann
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V. K. Subbiah
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S. Swientek
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V. Syropoulos
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M. Szczekowski
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P. Szczypka
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T. Szumlak
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E. Teodorescu
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F. Teubert
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C. Thomas
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W. C. Zhang
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Y. Zhang
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A. Zhelezov
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A. Zhokhov
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L. Zhong
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A. Zvyagin
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Abstract
Exclusive $J/\psi$ and $\psi(2S)$ vector meson production has been observed in the dimuon channel using the LHCb detector. The cross-section times branching fractions to two muons with pseudorapidities between 2.0 and 4.5 are measured to be $ \sigma_{pp\rightarrow J/\psi (\rightarrow \mu^{+} \mu^{-})} (2.0 <\eta_{\mu^{\pm}}< 4.5) = 307 \pm 21 \pm 36~\text{pb}, \sigma_{pp\rightarrow \psi(2S) (\rightarrow \mu^{+} \mu^{-})} (2.0 <\eta_{\mu^{\pm}}< 4.5) = 7.8 \pm 1.3 \pm 1.0~\text{pb}, $ where the first uncertainties are statistical and the second are systematic. The measurements are found to be in good agreement with results from previous experiments and theoretical predictions. The $J/\psi$ photoproduction cross-section has been measured as a function of the photon-proton centre-of-mass energy. The results are consistent with measurements obtained at HERA and confirm a similar power law behaviour for the photoproduction cross-section.