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Diffractive electroproduction of ρ and ϕ mesons at HERA

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 ≤...

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Bibliographic Details
Main Authors: Aaron, Francisc Dionisie (Author) , Schöning, André (Author) , Schultz-Coulon, Hans-Christian (Author)
Corporate Author: H1 Collaboration (Author)
Format: Article (Journal)
Language:English
Published: 07 May 2010
In: Journal of high energy physics
Year: 2010, Issue: 5, Pages: 1-111
ISSN:1029-8479
DOI:10.1007/JHEP05(2010)032
Online Access:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1007/JHEP05(2010)032
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Author Notes:The H1 Collaboration*

MARC

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520 |a 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 ≤ Q2 ≤ 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 Q2, 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 Q2 larger than 10 to 20 GeV2. They support flavour independence of the diffractive exchange, expressed in terms of the scaling variable (Q2+M2V)/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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