Reaction $γ p \to p ρ^{0}$ with Linearly Polarized Photons at 2.8 and 4.7 GeV: Cross Sections and the $ρ^{0}$ Mass Shift

Rho photoproduction is studied at 2.8 and 4.7 GeV using a linearly polarized photon beam in a hydrogen bubble chamber. The dependence of the

ρ^{0}

mass shape on the momentum transfer is inconsistent with the Ross-Stodolsky factor. The production of

π^{+} π^{-}

pairs in the

s

-channel c.m. helicity-conserving

p

-wave state accounts for almost all events in the

ρ

region. Evidence is presented for an interference of

ρ^{0}

production with background. The data are compared with the Söding model and total and differential cross sections for

ρ^{0}

production are presented.

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Reactionγp→pρ0with Linearly Polarized Photons at 2.8 and 4.7 GeV: Cross Sections and theρ0Mass Shift