Phys. Rev. Lett. 87, 202301 (2001) [5 pages]Longitudinal Electroproduction of Charged Pions from 1H, 2H, and 3HeReceived 25 May 2001; published 23 October 2001 Separated longitudinal and transverse cross sections for charged pion electroproduction from 1H, 2H, and 3He were measured at Q2 = 0.4(GeV/c)2 for two values of the invariant mass, W = 1.15GeV and W = 1.60GeV, in a search for a mass dependence which would signal the effect of nuclear pions. This is the first such study that includes recoil momenta significantly above the Fermi surface. The longitudinal cross section, if dominated by the pion-pole process, should be sensitive to nuclear pion currents. Comparisons of the longitudinal cross section target ratios to a quasifree calculation reveal a significant suppression in 3He at W = 1.60GeV. The W = 1.15GeV results are consistent with simple estimates of the effect of nuclear pion currents, but are also consistent with pure quasifree production. © 2001 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.87.202301
DOI:
10.1103/PhysRevLett.87.202301
PACS:
25.30.Rw, 13.60.Le, 25.10.+s, 25.30.Fj
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