Observation of a Coherence Length Effect in Exclusive Rho^0 Electroproduction

Abstract

Exclusive incoherent electroproduction of the rho^0(770) meson from 1H, 2H, 3He, and 14N targets has been studied by the HERMES experiment at squared four-momentum transfer Q**2>0.4 GeV**2 and positron energy loss nu from 9 to 20 GeV. The ratio of the 14N to 1H cross sections per nucleon, known as the nuclear transparency, was found to decrease with increasing coherence length of quark-antiquark fluctuations of the virtual photon. The data provide clear evidence of the interaction of the quark- antiquark fluctuations with the nuclear medium.

RevTeX, 5 pages, 3 figures

References in corpus (2)

• Measurement of the Neutron Spin Structure Function $g_1^n$ with a Polarized ^3He Target
• The HERMES Spectrometer

Cited by in corpus (33)

• Coherent gamma-gamma and gamma-A interactions in very peripheral collisions at relativistic ion colliders
• Nonperturbative Effects in Gluon Radiation and Photoproduction of Quark Pairs
• Nuclear Deep-Inelastic Lepton Scattering and Coherence Phenomena
• Coherence Phenomena in Charmonium Production off Nuclei at the Energies of RHIC and LHC
• Hadrons in the Nuclear Medium
• Nuclear transparency from quasielastic A(e,e'p) reactions uo to Q^2=8.1 (GeV/c)^2
• Selected Topics in High Energy Semi-Exclusive Electro-Nuclear Reactions
• Color Transparency versus Quantum Coherence in Electroproduction of Vector Mesons off Nuclei
• Color Transparency: past, present and future
• The Q^2-Dependence of Nuclear Transparency for Exclusive ${\rho }^0$ Production
• Evidence for the Onset of Color Transparency in ${\rho }^0$ Electroproduction off Nuclei
• Nuclear Transparency in 90 Degree c.m. Quasielastic A(p,2p) Reactions
• Study of the A(e,e'${\pi }^{+}$) Reaction on ${}^1$H, ${}^2$H, ${}^{12}$C, ${}^{27}$Al, ${}^{63}$Cu and ${}^{197}$Au
• Nuclear physics with a medium-energy Electron-Ion Collider
• Real and Virtual Compton Scattering in a Regge Approach
• Searching for the properties of nuclear matter using proton-carbon and deuteron-carbon collisions at 4.2 a gev/c
• Rescattering in Meson Photoproduction off Few Body Systems
• Exclusive electroproduction of phi mesons at 4.2 GeV
• Hadron formation in high energy photonuclear reactions
• Double-Spin Asymmetry in the Cross Section for Exclusive rho^0 Production in Lepton-Proton Scattering
• Color Transparency at Low Energies: Predictions for JLAB
• Puzzles of J/Psi production off nuclei
• Hard Exclusive Electroproduction of ${\pi }^{+}{\pi }^{-}$ Pairs
• Incoherent rho^0 electroproduction off nuclei
• Subprocess Size in Hard Exclusive Scattering
• Production of Polarized Vector Mesons off Nuclei
• Breakdown of PCAC in diffractive neutrino interactions
• DIS structure functions and the double-spin asymmetry in ${\rho }^0$ electroproduction within a Regge approach
• Coherence Effects in Diffractive Electroproduction of rho Mesons from Nuclei
• Color transparency in the reaction nuclear rho production by virtual photons
• Diffractive Interactions at DIS99: Experimental Summary
• The search for the onset of Color Transparency: a status report
• Color Transparency via Coherent Exclusive rho Production