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**1 - 3**of**3**### Vector Meson Production in the Forward and Backward Region of the H1 Experiment at HERA Diploma Thesis by

"... In this thesis, the Forward and Backward Silicon Detectors of the H1 experiment are used for the first time to identify a hadron from an invariant mass distribution of two decay particles. The purpose of this investigation is to observe elastic photoproduction of J/ψ particles in electron proton col ..."

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In this thesis, the Forward and Backward Silicon Detectors of the H1 experiment are used for the first time to identify a hadron from an invariant mass distribution of two decay particles. The purpose of this investigation is to observe elastic photoproduction of J/ψ particles in electron proton collisions with data taken by the H1 detector during 2006 and 2007. The main physics motivation is to extend the measurement of elastic J/ψ photoproduction to high and low total hadronic energies. A study of the detector components necessary to identify the J/ψ mesons from their decays into two muons is performed. After the signal reconstruction from the invariant mass distribution, the cross section of the production mechanism is extracted and compared with previously published measurements and model predictions. Kurzfassung In dieser Arbeit werden die Vorwärts- und Rückwärts-Siliziumdetektoren des H1-Experimentes benutzt, um zum ersten Mal ein Hadron aus der invarianten Massenverteilung von zwei Zerfallsteilchen zu bestimmen. Das Ziel dieser Untersuchung ist die Beobachtung elastischer J/ψ Photoproduktion in Elektron-Proton-Streuprozessen mit Daten des

### THERA - Electron-Proton Scattering at √s ~ 1TeV

"... aor 40 , M. McDermott 23 , K. Nagano 19 , T. Naumann 13 ,W.vanNeerven 22 ,P.Newman 6 , N. Nikolaev 18 ,C.Pascaud 34 , E. Perez 39 ,D.Pitzl 13 ,B.Potter 32 ,G.Radel 1 , V. Ravindran 3 , I. Redondo 26 , E. Reya 14 ,A.DeRoeck 11 ,E.Rondio 42 ,J.Ruan 15 ,W.Schafer ..."

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aor 40 , M. McDermott 23 , K. Nagano 19 , T. Naumann 13 ,W.vanNeerven 22 ,P.Newman 6 , N. Nikolaev 18 ,C.Pascaud 34 , E. Perez 39 ,D.Pitzl 13 ,B.Potter 32 ,G.Radel 1 , V. Ravindran 3 , I. Redondo 26 , E. Reya 14 ,A.DeRoeck 11 ,E.Rondio 42 ,J.Ruan 15 ,W.Schafer 18 ,S.Schlenstedt 13 , P. Schleper 13 , U. Schneekloth 13 ,S.Soldner-Rembold 16,11 , H. Spiesberger 27 , U. Stosslein 13 , M. Strikman 36 , S. Sultansoy 5 , K. Tuchin 40 , W.K. Tung 29 ,R.Wallny 46 , D. Waters<

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, 804

"... We study the possible holographic connection between the Regge limit in QCD and critical gravitational collapse of a perfect fluid in higher dimensions. We begin by analyzing the problem of critical gravitational collapse of a perfect fluid in any number of dimensions and numerically compute the ass ..."

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We study the possible holographic connection between the Regge limit in QCD and critical gravitational collapse of a perfect fluid in higher dimensions. We begin by analyzing the problem of critical gravitational collapse of a perfect fluid in any number of dimensions and numerically compute the associated Choptuik exponent in d = 5, 6 and 7 for a range of values of the speed of sound of the fluid. Using continuous self-similarity as guiding principle, a holographic correspondence between this process and the phenomenon of parton saturation in high-energy scattering in QCD is proposed. This holographic connection relates strong gravitational physics in the bulk with (nonsupersymmetric) QCD at weak coupling in four dimensions. 1