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Diffractive Deep-Inelastic Scattering with a Leading Proton at HERA

A. Aktas V. Andreev T. Anthonis S. Aplin A. Asmone A. Astvatsatourov A. Babaev S. Backovic J. Bahr A. Baghdasaryan P. Baranov E. Barrelet 1 W. Bartel S. Baudrand 2 S. Baumgartner J. Becker M. Beckingham O. Behnke O. Behrendt A. Belousov Ch. Berger N. Berger J.C. Bizot 2 M.-O. Boenig V. Boudry 3 J. Bracinik G. Brandt V. Brisson 2 D.P. Brown D. Bruncko F.W. Busser A. Bunyatyan G. Buschhorn L. Bystritskaya A.J. Campbell S. Caron F. Cassol-Brunner 4 K. Cerny V. Cerny V. Chekelian J.G. Contreras J.A. Coughlan B.E. Cox G. Cozzika J. Cvach J.B. Dainton W.D. Dau K. Daum Y. de Boer B. Delcourt 2 A. de Roeck K. Desch E.A. de Wolf C. Diaconu 4 V. Dodonov A. Dubak G. Eckerlin V. Efremenko S. Egli R. Eichler F. Eisele M. Ellerbrock W. Erdmann S. Essenov A. Falkewicz P.J.W. Faulkner L. Favart A. Fedotov R. Felst J. Ferencei L. Finke M. Fleischer P. Fleischmann Y.H. Fleming G. Flucke A. Fomenko I. Foresti G. Franke T. Frisson 3 E. Gabathuler E. Garutti J. Gayler C. Gerlich S. Ghazaryan S. Ginzburgskaya A. Glazov I. Glushkov L. Goerlich M. Goettlich N. Gogitidze S. Gorbounov C. Goyon C. Grab T. Greenshaw M. Gregori B.R. Grell G. Grindhammer C. Gwilliam D. Haidt L. Hajduk M. Hansson G. Heinzelmann R.C.W. Henderson H. Henschel O. Henshaw G. Herrera M. Hildebrandt K.H. Hiller D. Hoffmann 4 R. Horisberger A. Hovhannisyan T. Hreus S. Hussain M. Ibbotson M. Ismail M. Jacquet 2 L. Janauschek X. Janssen V. Jemanov L. Jonsson D.P. Johnson A.W. Jung H. Jung M. Kapichine J. Katzy N. Keller I.R. Kenyon C. Kiesling M. Klein C. Kleinwort T. Klimkovich T. Kluge G. Knies A. Knutsson V. Korbel P. Kostka K. Krastev J. Kretzschmar A. Kropivnitskaya K. Kruger J. Kuckens M.P.J. Landon W. Lange T. Lastovicka G. Lastovicka-Medin P. Laycock A. Lebedev G. Leibenguth V. Lendermann S. Levonian L. Lindfeld K. Lipka A. Liptaj B. List E. Lobodzinska N. Loktionova R. Lopez-Fernandez V. Lubimov A.-I. Lucaci-Timoce H. Lueders D. Luke T. Lux L. Lytkin A. Makankine N. Malden E. Malinovski S. Mangano P. Marage R. Marshall M. Martisikova H.-U. Martyn S.J. Maxfield D. Meer A. Mehta K. Meier A.B. Meyer H. Meyer J. Meyer S. Mikocki I. Milcewicz-Mika D. Milstead D. Mladenov A. Mohamed F. Moreau 3 A. Morozov J.V. Morris M.U. Mozer K. Muller P. Murin K. Nankov B. Naroska T. Naumann P.R. Newman C. Niebuhr A. Nikiforov D. Nikitin G. Nowak M. Nozicka R. Oganezov B. Olivier J.E. Olsson S. Osman D. Ozerov V. Palichik I. Panagoulias T. Papadopoulou C. Pascaud 2 G.D. Patel M. Peez E. Perez D. Perez-Astudillo A. Perieanu A. Petrukhin D. Pitzl R. Placakyte B. Portheault 2 B. Povh P. Prideaux N. Raicevic P. Reimer A. Rimmer C. Risler E. Rizvi P. Robmann B. Roland R. Roosen A. Rostovtsev Z. Rurikova S. Rusakov F. Salvaire D.P.C. Sankey E. Sauvan 4 S. Schätzel F.-P. Schilling S. Schmidt S. Schmitt C. Schmitz L. Schoeffel A. Schoning H.-C. Schultz-Coulon K. Sedlak F. Sefkow R.N. Shaw-West I. Sheviakov L.N. Shtarkov T. Sloan P. Smirnov Y. Soloviev D. South V. Spaskov A. Specka 3 B. Stella J. Stiewe I. Strauch U. Straumann V. Tchoulakov G. Thompson P.D. Thompson F. Tomasz D. Traynor P. Truol I. Tsakov G. Tsipolitis I. Tsurin J. Turnau E. Tzamariudaki Martin Urban A. Usik D. Utkin S. Valkar A. Valkarova C. Vallee 4 P. van Mechelen A. Vargas Trevino Y. Vazdik C. Veelken A. Vest S. Vinokurova V. Volchinski B. Vujicic K. Wacker J. Wagner G. Weber R. Weber D. Wegener C. Werner N. Werner M. Wessels B. Wessling C. Wigmore C. Wissing R. Wolf E. Wunsch S. Xella W. Yan V. Yeganov J. Zacek J. Zalesak Zhiqing Zhang 2 A. Zhelezov A. Zhokin Y.C. Zhu J. Zimmermann T. Zimmermann H. Zohrabyan F. Zomer 2 T.N. Trinh 4
Abstract : The cross section for the diffractive deep-inelastic scattering process $ep \to e X p$ is measured, with the leading final state proton detected in the H1 Forward Proton Spectrometer. The data analysed cover the range \xpom <0.1 in fractional proton longitudinal momentum loss, 0.08 < |t| < 0.5 GeV^{-2} in squared four-momentum transfer at the proton vertex, 2 < Q^2 < 50 GeV^2 in photon virtuality and 0.004 < \beta = x / \xpom < 1, where x is the Bjorken scaling variable. For $\xpom \lapprox 10^{-2}$, the differential cross section has a dependence of approximately ${\rm d} \sigma / {\rm d} t \propto e^{6 t}$, independently of \xpom, \beta and Q^2 within uncertainties. The cross section is also measured triple differentially in \xpom, \beta and Q^2. The \xpom dependence is interpreted in terms of an effective pomeron trajectory with intercept $\alpha_{\pom}(0)=1.114 \pm 0.018 ({\rm stat.}) \pm 0.012 ({\rm syst.}) ^{+0.040}_{-0.020} ({\rm model})$ and a sub-leading exchange. The data are in good agreement with an H1 measurement for which the event selection is based on a large gap in the rapidity distribution of the final state hadrons, after accounting for proton dissociation contributions in the latter. Within uncertainties, the dependence of the cross section on x and Q^2 can thus be factorised from the dependences on all studied variables which characterise the proton vertex, for both the pomeron and the sub-leading exchange.
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Submitted on : Monday, January 8, 2007 - 10:30:46 AM
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A. Aktas, V. Andreev, T. Anthonis, S. Aplin, A. Asmone, et al.. Diffractive Deep-Inelastic Scattering with a Leading Proton at HERA. European Physical Journal C: Particles and Fields, Springer Verlag (Germany), 2006, 48, pp.749-766. ⟨10.1140/epjc/s10052-006-0046-0⟩. ⟨in2p3-00079761⟩

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