The production of ground state vector mesons, V = ρ, ω, φ, J/ψ,Y, has been extensively studied at ep collider. Latest results were obtained from the study of two pion exclusive electroproduction in the mass range 0.4 < Mππ < 2.5 GeV using 82 pb-1 of integrated luminosity collected during 1998 - 2000 on ep collider with center-of-mass energy 318 GeV. The analysis was carried out in the kinematic range of 2 < Q2 < 80 GeV2, 32 < W < 180 GeV and |t| < 0.6 GeV2. The two-pion invariant mass distribution is interpreted in terms of the pion electromagnetic form factor, |F(M ππ)|, assuming that the studied mass range includes the contributions of the ρ, ρ′ and ρ″ vector meson states. The masses and widths of resonances are obtained and subsequently the Q 2 dependence of the cross-section ratios σ(ρ′ → ππ)/σ(ρ) and σ(ρ″ → ππ)/ σ(ρ) was extracted. The pion form factor obtained in the present analysis is compared to that obtained in e+e- → π+π-.
|Number of pages||5|
|State||Published - 2013|
|Event||4th International Conference on Current Problems in Nuclear Physics and Atomic Energy, NPAE 2012 - Kyiv, Ukraine|
Duration: 3 Sep 2012 → 7 Sep 2012
|Conference||4th International Conference on Current Problems in Nuclear Physics and Atomic Energy, NPAE 2012|
|Period||3/09/12 → 7/09/12|