Diffractive photoproduction of J/ψ mesons with large momentum transfer at HERA

Physics Letters B (2003)

Å. Aktas V. Andreev T. Anthonis A. Astvatsatourov A. Babaev S. Backović J. Bähr P. Baranov E. Barrelet W. Bartel S. Baumgartner J. Becker M. Beckingham A. Beglarian O. Behnke O. Behrendt A. Belousov Ch. Berger T. Berndt J.C. Bizot J. Böhme M.-O. Boenig V. Boudry J. Braciník W. Braunschweig V. Brisson H.-B. Bröker Dunstan Brown D. Bruncko F.W. Büsser A. Bunyatyan A. Burrage G. Buschhorn L. Bystritskaya A.J. Campbell S. Caron F. Cassol-Brunner V. Chekelian D. Clarke C. Collard J.G. Contreras Y.R. Coppens J. A. Coughlan M.-C. Cousinou B. E. Cox G. Cozzika J. Cvach J.B. Dainton W.D. Dau K. Daum Marcus Davidsson B. Delcourt Nicolas Delerue R. Demirchyan A. De Roeck E. A. De Wolf C. Diaconu J. Dingfelder P. Dixon V. Dodonov J.D. Dowell A. Dubak C. Duprel G. Eckerlin V. Efremenko S. Egli R. Eichler F. Eisele M. Ellerbrock E. Elsen M. Erdmann M. Erdmann Peter Faulkner L. Favart A. Fedotov R. Felst J. Ferencei S. Ferron M. Fleischer P. Fleischmann Y.H. Fleming G. Flucke G. Flügge A. Fomenko I. Foresti J. Formánek G. Franke G. Frising E. Gabathuler K. Gabathuler J. Garvey J. Gassner J. Gayler R. Gerhards C. Gerlich S. Ghazaryan L. Goerlich N. Gogitidze S. Gorbounov C. Grab Varlen Grabski H. Grässler T. Greenshaw G. Grindhammer D. Haidt L. Hajduk J. Haller B. Heinemann G. Heinzelmann R. C. W. Henderson H. Henschel O. Henshaw R. Heremans G. Herrera I. Herynek M. Hildebrandt M. Hilgers K. H. Hiller J. Hladký P. Höting D. Hoffmann R. Horisberger A. Hovhannisyan M. Ibbotson M. Jacquet L. Janauschek X. Janssen V. Jemanov L. Jönsson Carrie L. Johnson Daniel Johnson M.A.S. Jones H. Jung D. Kant M. Kapichine M. Karlsson J. Katzy Frerich J. Keil N. Keller J. Kennedy I. R. Kenyon C. Kiesling M. Klein C. Kleinwort T. Kluge G. Knies B. Koblitz S.D. Kolya V. Korbel P. Kostka R. Koutouev A. Koutov J. Kroseberg K. Krüger J. Kueckens T. Kuhr M. P. J. Landon W. Lange T. Laštovička P. Laycock A. Lebedev B. Leißner R. Lemrani V. Lendermann S. Levonian B. List E. Lobodzinska N. Loktionova R. López-Fernández V. Lubimov H. Lueders S. Lüders D. Lüke L. Lytkin A. Makankine N. Malden E. Malinovski S. Mangano P. Marage J. Marks R. Marshall H.-U. Martyn J. Martyniak S. J. Maxfield D. Meer A. Mehta K. Meier A. Meyer H. Meyer J. Meyer S. Michine S. Mikocki D. A. Milstead S. Mohrdieck F. Moreau A. Morozov J.V. Morris K. Müller П. Мурін V. Nagovizin B. Naroska J. Naumann T. Naumann P. R. Newman F. Niebergall C. Niebuhr D. Nikitin G. Nowak M. Nožička Olivier Bourron J.E. Olsson D. Ozerov V. Panassik C. Pascaud G. D. Patel M. Peez E. Pérez A. Petrukhin J. P. Phillips D. Pitzl R. Pöschl Bogdan Povh N. Raičević J. Rauschenberger P. Reimer B. Reisert C. Risler E. Rizvi P. Robmann R. Roosen A. Rostovtsev S. V. Rusakov K. Rybicki D. P. C. Sankey E. Sauvan S. Schätzel J. Scheins F.-P. Schilling P. Schleper D. Schmidt S. Schmidt S. Schmitt M. Schneider L. Schoeffel A. Schöning V. Schröder H.-C. Schultz-Coulon C. Schwanenberger Kamil Sedlák F. Sefkow I. Sheviakov L.N. Shtarkov Y. Sirois T. Sloan P. Smirnov Y. Soloviev D. South V. Spaskov A. Specka H. Spitzer R. Stamen B. Stella J. Stiewe I. Strauch U. Straumann G. Thompson P. D. Thompson F. Tomasz D. Traynor P. Truöl G. Tsipolitis I. Tsurin J. Turnau J.E. Turney E. Tzamariudaki A. Uraev M. Urban A. Usik Š. Valkár A. Valkárová C. Vallée P. Van Mechelen A. Vargas Trevino S. Vassiliev Y. Vazdik C. Veelken A. Vest A. Vichnevski V. Volchinski K. Wacker J. Wagner R. Wallny B. Waugh G. Weber R. Weber D. Wegener C. Werner N. Werner M. Wessels B. Wessling M. Winde G.G. Winter Ch. Wissing E.-E. Woehrling E. Wünsch A.C. Wyatt J. Žáček J. Zálešâk Z. Zhang A. Zhokin F. Zomer M. zur Nedden

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Abstract:

The diffractive photoproduction of J/psi mesons is measured with the H1 detector at the ep collider HERA using an integrated luminosity of 78 pb^-1. The differential cross section d sigma(gamma p -> J/psi Y) / d t is studied in the range 2 < |t| < 30 GeV^2, where t is the square of the four-momentum transferred at the proton vertex. The cross section is also presented as a function of the photon-proton centre-of-mass energy W in three t intervals, spanning the range 50 < W < 200 GeV. A fast rise of the cross section with W is observed for each t range and the slope for the effective linear Pomeron trajectory is measured to be alpha^\prime= -0.0135 \pm 0.0074 (stat.) \pm 0.0051 (syst.) GeV^-2. The measurements are compared with perturbative QCD models based on BFKL and DGLAP evolution. The data are found to be compatible with s-channel helicity conservation.

Keywords:

Perturbative QCD

Pomeron

Helicity

Momentum transfer

Topics:

High-Energy Particle Collisions Research

Particle physics theoretical and experimental studies

Quantum Chromodynamics and Particle Interactions

10.1016/j.physletb.2003.06.056

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Where are the BFKL Pomeron and shadowing corrections in DIS?

arXiv (Cornell University) (1997)

Eugene Levin

In this talk, I will argue that the HERA experimental data show that the typical parameter ($κ$) responsible for the value of the shadowing corrections (SC) in DIS is so large that the BFKL Pomeron is hidden under SC. The SC turn out to be large enough but mostly for the gluon structure function which is not well determined by the available experimental data and by the current theoretical procedure.

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10.48550/arxiv.hep-ph/9709226

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Citations (1)

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Physics Letters B (1994)

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AIP conference proceedings (2017)

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arXiv (Cornell University) (1999)

S. V. Goloskokov

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Physics Letters B (1999)

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Physics Letters B (1994)

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Where are the BFKL Pomeron and shadowing corrections in DIS

arXiv (Cornell University) (1997)

E. Levin

In this talk, I will argue that the HERA experimental data show that the typical parameter ($\kappa$) responsible for the value of the shadowing corrections (SC) in DIS is so large that the BFKL Pomeron is hidden under SC. The SC turn out to be large enough but mostly for the gluon structure function which is not well determined by the available experimental data and by the current theoretical procedure.

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Journal of High Energy Physics (2014)

E. Levin I. K. Potashnikova

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arXiv (Cornell University) (1994)

Marco Genovese Б. Г. Захаров N. N. Nikolaev

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Zeitschrift für Physik C (1993)

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Citations (39)