Measurement of elastic electroproduction of phi mesons at HERA
H1 Collaboration, C. Adloff
Abstract
The elastic electroproduction of phi mesons is studied at HERA with the H1 detector for photon virtualities 1 < Q2 < 15 GeV2 and hadronic centre of mass energies 40 < W < 130 GeV. The Q2 and t dependences of the cross section are extracted (t being the square of the four-momentum transfer to the target proton). When plotted as function of (Q2 + MV2) and scaled by the appropriate SU(5) quark charge factor, the phi meson cross section agrees within errors with the cross sections of the vector mesons V = rho, omega and J/psi. A detailed analysis is performed of the phi meson polarisation state and the ratio of the production cross sections for longitudinally and transversely polarised phi mesons is determined. A small but significant violation of s-channel helicity conservation (SCHC) is observed.
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