Measurement of exclusive omega electroproduction at HERA

The exclusive electroproduction of ω mesons, ep → eωp , has been studied in the kinematic range 3< Q 2 <20 GeV 2 , 40< W <120 GeV and | t |<0.6 GeV 2 with the ZEUS detector at HERA using an integrated luminosity of 37.7 pb −1 . The ω mesons were identified via the decay ω → π + π − π 0 . The exclusive cross section in the above kinematic region is σ ep → eωp =0.108±0.014(stat.)±0.026(syst.) nb. The reaction ep → eφp , φ → π + π − π 0 , has also been measured. The cross sections, as well as the ratios σ γ ∗ p→ωp /σ γ ∗ p→ρ 0 p and σ γ ∗ p→ωp /σ γ ∗ p→φp , are presented as a function of W and Q 2 . Thus, for the first time, the properties of ω electroproduction can be compared to those of ρ 0 , φ and J / ψ electroproduction at high W .

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15 pages including 4 figures Report-no: DESY-00-084

positron p: colliding beams
positron p: exclusive reaction
vector meson: electroproduction
omega(783): hadronic decay
Phi(1020): hadronic decay
rho(770)0
channel cross section: ratio
energy dependence
momentum transfer dependence
symmetry: SU(4)

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Figures(5)

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