Abstract
Diffractive electroproduction of ρ and ϕ mesons is measured at HERA with the H1 detector in the elastic and proton dissociative channels. The data correspond to an integrated luminosity of 51 pb−1. About 10500 ρ and 2000 φ events are analysed in the kinematic range of squared photon virtuality 2.5 ≤ Q 2 ≤ 60 GeV2, photon-proton centre of mass energy 35 ≤ W ≤ 180 GeV and squared four-momentum transfer to the proton |t| ≤ 3 GeV2. The total, longitudinal and transverse cross sections are measured as a function of Q 2, W and |t|. The measurements show a transition to a dominantly “hard” behaviour, typical of high gluon densities and small \( q\overline q \) dipoles, for Q 2 larger than 10 to 20 GeV2. They support flavour independence of the diffractive exchange, expressed in terms of the scaling variable (Q 2+M 2 V )/4, and proton vertex factorisation. The spin density matrix elements are measured as a function of kinematic variables. The ratio of the longitudinal to transverse cross sections, the ratio of the helicity amplitudes and their relative phases are extracted. Several of these measurements have not been performed before and bring new information on the dynamics of diffraction in a QCD framework. The measurements are discussed in the context of models using generalised parton distributions or universal dipole cross sections.
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ArXiv ePrint: 0910.5831
Also at Physics Department, National Technical University, Zografou Campus, GR-15773 Athens, Greece
Also at Rechenzentrum, Universität Wuppertal, Wuppertal, Germany
Also at University of P.J. Šafárik, Košice, Slovak Republic
Also at CERN, Geneva, Switzerland
Also at Max-Planck-Institut für Physik, München, Germany
Also at Comenius University, Bratislava, Slovak Republic
Also at DESY and University Hamburg, Helmholtz Humboldt Research Award
Also at Faculty of Physics, University of Bucharest, Bucharest, Romania
Supported by a scholarship of the World Laboratory Björn Wiik Research Project 51 Also at Ulaanbaatar University, Ulaanbaatar, Mongolia
Supported by the Bundesministerium für Bildung und Forschung, FRG, under contract numbers 05 H1 1GUA /1, 05 H1 1PAA /1, 05 H1 1PAB /9, 05 H1 1PEA /6, 05 H1 1VHA /7 and 05 H1 1VHB /5
Supported by the UK Science and Technology Facilities Council, and formerly by the UK
Particle Physics and Astronomy Research Council
Supported by FNRS-FWO-Vlaanderen, IISN-IIKW and IWT and by Interuniversity
Attraction Poles Programme, Belgian Science Policy
Partially Supported by Polish Ministry of Science and Higher Education, grant PBS/DESY/70/2006
Supported by the Deutsche Forschungsgemeinschaft
Supported by VEGA SR grant no. 2/7062/ 27
Supported by the Swedish Natural Science Research Council
Supported by the Ministry of Education of the Czech Republic under the projects LC527, INGO-1P05LA259 and MSM0021620859
Supported by the Swiss National Science Foundation
Supported by CONACYT, México, grant 48778-F
Russian Foundation for Basic Research (RFBR), grant no 1329.2008.2
This project is co-funded by the European Social Fund (75%) and National Resources (25%) - (EPEAEK II) - PYTHAGORAS II
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The H1 Collaboration., Aaron, F.D., Aldaya Martin, M. et al. Diffractive electroproduction of ρ and ϕ mesons at HERA. J. High Energ. Phys. 2010, 32 (2010). https://doi.org/10.1007/JHEP05(2010)032
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DOI: https://doi.org/10.1007/JHEP05(2010)032