Observation of a coherence length effect in exclusive rho0 electroproduction

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.

Note:

RevTeX, 5 pages, 3 figures Report-no: DESY 98-178

positron p: exclusive reaction
positron nucleus: incoherent interaction
deuteron
helium: nuclide
nitrogen
photon: resolved
quark antiquark: initial-state interaction
rho(770)0: electroproduction
rho(770)0: hadronic decay
mass spectrum: two-pion

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