Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2000-05-05
Phys.Lett.B483:360-372,2000
Physics
High Energy Physics
High Energy Physics - Experiment
17 pages, 7 figures and 2 tables
Scientific paper
10.1016/S0370-2693(00)00613-4
The elastic electroproduction of phi mesons is studied at HERA with the H1 detector for photon virtualities 1 < Q^2 < 15 GeV^2 and hadronic centre of mass energies 40 < W < 130 GeV. The Q^2 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 (Q^2 + M_V^2) 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.
Adloff Catherine
H1 Collaboration
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