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A measurement of the t dependence of the helicity structure of diffractive rho meson electroproduction at HERA

MPS-Authors
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Bunyatyan,  A.
Prof. Bogdan Povh, Emeriti, MPI for Nuclear Physics, Max Planck Society;

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Dodonov,  V.
Prof. Bogdan Povh, Emeriti, MPI for Nuclear Physics, Max Planck Society;

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Lytkin,  L.
Prof. Bogdan Povh, Emeriti, MPI for Nuclear Physics, Max Planck Society;

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Potachnikova,  I.
Prof. Bogdan Povh, Emeriti, MPI for Nuclear Physics, Max Planck Society;

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Povh,  B.
Prof. Bogdan Povh, Emeriti, MPI for Nuclear Physics, Max Planck Society;

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Weber,  M.
Division Prof. Dr. Manfred Lindner, MPI for Nuclear Physics, Max Planck Society;

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Citation

Adloff, C., Andreev, V., Andrieu, B., Anthonis, T., Arkadov, V., Astvatsatourov, A., et al. (2002). A measurement of the t dependence of the helicity structure of diffractive rho meson electroproduction at HERA. Physics Letters B, 539(1-2), 25-39.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0011-82EA-2
Abstract
The helicity structure of the diffractive electroproduction of rho mesons, e + p --> e + rho + Y, is studied in a previously unexplored region of large four-momentum transfer squared at the proton vertex, t: 0 < t' < 3 GeV2, where t' = \t\ - \t\ min. The data used are collected with the HI detector at HERA in the kinematic domain 2.5 < Q(2) < 60 GeV2, 40 < W < 120 GeV No t dependence of the r(00)(04) spin density matrix element is found. A significant t dependent helicity non-conservation from the virtual photon to the rho meson is observed for the spin density matrix element combinations r(00)(5) + 2r(11)(5) and r(00)(1) + 2r(11)(1). These t dependences are consistently described by a perturbative QCD model based on the exchange of two gluons. (C) 2002 Elsevier Science B.V. All rights reserved.