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Elastic Photoproduction of $J/\psi$ and $\Upsilon$ Mesons at HERA

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  • [Phys:Hexp] Physics/High Energy Physics - Experiment
  • [Phys:Hexp] Physique/Physique Des Hautes Energies - Expérience
  • Physics


[in2p3-00013500, v1] Elastic Photoproduction of $J/\psi$ and $\Upsilon$ Mesons at HERA DESY 00-037 ISSN 0418-9833 March 2000 Elastic Photoproduction of J= andΥMesons at HERA H1 Collaboration Abstract Cross sections for elastic photoproduction of J/ψ and Υ mesons are presented. For J/ψ mesons the dependence on the photon-proton centre-of-mass energy Wγp is analysed in an extended range with respect to previous measurements of 26 � Wγp � 285 GeV. The measured energy dependence is parameterized as σγp/ W �γp with δ = 0.83 � 0.07. The differential cross section dσ/dt for J/ψ mesons is derived, its dependence onWγp and on t is analysed and the effective trajectory (in terms of Regge theory) is determined to be α(t) = (1.27 � 0.05) + (0.08 � 0.17) � t/GeV2. Models based on perturbative QCD and on pomeron exchange are compared to the data. Submitted to Phys. Lett. B in 2p 3- 00 01 35 00 , v er sio n 1 - 1 7 O ct 2 00 0 Author manuscript, published in "N/P" C. Adloff33, V. Andreev24, B. Andrieu27, V. Arkadov35, A. Astvatsatourov35, I. Ayyaz28, A. Babaev23, J. Ba¨hr35, P. Baranov24, E. Barrelet28, W. Bartel10, U. Bassler28, P. Bate21, A. Beglarian34, O. Behnke10, C. Beier14, A. Belousov24, T. Benisch10, Ch. Berger1, G. Bernardi28, T. Berndt14, J.C. Bizot26, K. Borras7, V. Boudry27, W. Braunschweig1, V. Brisson26, H.-B. Bro¨ker2, D.P. Brown21, W. Bru¨ckner12, P. Bruel27, D. Bruncko16, J. Bu¨rger10, F.W. Bu¨sser11, A. Bunyatyan12;34, H. Burkhardt14, A. Burrage18, G. Buschhorn25, A.J. Campbell10, J. Cao26, T. Carli25, S. Caron1, E. Chabert22, D. Clarke5, B. Clerbaux4, C. Collard4, J.G. Contreras7;41, J.A. Coughlan5, M.-C. Cousinou22, B.E. Cox21, G. Cozzika9, J. Cvach29, J.B. Dainton18, W.D. Dau15, K. Daum33;39, M. David9;y, M. Davidsson20, B. Delcourt26, N. Delerue22, R. Demirchyan34, A. De Roeck10;43, E.A. De Wolf4, C. Diaconu22, P. Dixon19, V. Dodonov12, J.D. Dowell3, A. Droutskoi23, C. Duprel2, G. Eckerlin10, D. Eckstein35, V. Efremenko23, S. Egli32, R. Eichle

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