Observation of color transparency in diffractive dissociation of pions

We have studied the diffractive dissociation into di-jets of 500 GeV/c pions scattering coherently from carbon and platinum targets. Extrapolating to asymptotically high energies (where t_{min} approaches 0) we find that when the per-nucleus cross-section for this process is parameterized as

\sigma = \sigma_0 A^{\alpha}

,

\alpha

has values near 1.6, the exact result depending on jet transverse momentum. These values are in agreement with those predicted by theoretical calculations of color-transparency.

pi- nucleus: coherent interaction
carbon
platinum
diffraction: dissociation
jet: pair production
color: transparency
cross section: parametrization
transverse momentum: spectrum
dependence: mass number
magnetic spectrometer: experimental results

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