APS » PROLA » Phys. Rev. Lett. » Volume 90 » Issue 5

Phys. Rev. Lett. 90, 052501 (2003) [6 pages]

Q2 Dependence of Nuclear Transparency for Exclusive ρ0 Production
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A. Airapetian et al. HERMES Collaboration
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Received 30 September 2002; published 6 February 2003

Exclusive coherent and incoherent electroproduction of the ρ0 meson from 1H and 14N targets has been studied at the HERMES experiment as a function of coherence length (lc), corresponding to the lifetime of hadronic fluctuations of the virtual photon, and squared four-momentum of the virtual photon (-Q2). The ratio of 14N to 1H cross sections per nucleon, called nuclear transparency, was found to increase (decrease) with increasing lc for coherent (incoherent) ρ0 electroproduction. For fixed lc, a rise of nuclear transparency with Q2 is observed for both coherent and incoherent ρ0 production, which is in agreement with theoretical calculations of color transparency.


©2003 The American Physical Society

URL: http://link.aps.org/abstract/PRL/v90/e052501
DOI: 10.1103/PhysRevLett.90.052501
PACS: 24.85.+p, 13.60.Le, 14.40.Cs, 25.30.Rw

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