Exclusive electroproduction of phi mesons at 4.2 GeV

Abstract

We studied the exclusive reaction e p --> e' p' phi using the phi --> K^+ K^- decay mode. The data were collected using a 4.2 GeV incident electron beam and the CLAS detector at Jefferson Lab. Our experiment covers the range in Q^2 from 0.7 to 2.2 GeV^2, and W from 2.0 to 2.6 GeV. Taken together with all previous data, we find a consistent picture of phi production on the proton. Our measurement shows the expected decrease of the t-slope with the vector meson formation time c Delta tau below 2 fm. At = 0.6 fm, we measure b_phi = 2.27 +- 0.42 GeV^-2. The cross section dependence on W as W^{0.2+-0.1} at Q^2 = 1.3 GeV^2 was determined by comparison with phi production at HERA after correcting for threshold effects. This is the same dependence as observed in photoproduction.

arXiv comment13 pages, LaTeX, 16 eps figures, 3 tables, submitted to Phys Rev C; revised Fig 9 and Subsec "Differential Cross Section"

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• First measurement of coherent $\varphi$-meson photoproduction on deuteron at low energies
• Electroproduction of the $\Lambda (1520)$ hyperon
• Exclusive channels in semi-inclusive production of pions and kaons
• Asymmetries in phi photoproduction and the OZI violation
• Channel coupling effects in $\rho$-meson photoproduction
• Investigation of electroproduction of $\varphi$ mesons off protons
• Spectral-fluctuations test of the quark-model baryon spectrum
• Spectral-statistics properties of the experimental and theoretical light baryon and meson spectra