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Phys. Rev. D 49, 5641–5670 (1994)

Measurement of kinematic and nuclear dependence of R=σL/σT in deep inelastic electron scattering

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S. Dasu et al.
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Received 4 November 1993; published in the issue dated 1 June 1994

We report results on a precision measurement of the ratio R=σL/σT in deep inelastic electron-nucleon scattering in the kinematic range 0.2x0.5 and 1Q210 (GeV/c)2. Our results show, for the first time, a clear falloff of R with increasing Q2. Our R results are in agreement with QCD predictions only when corrections for target mass effects and some additional higher twist effects are included. At small x, the data on R favor structure functions with a large gluon contribution. We also report results on the differences RA-RD and the cross section ratio σA/σD between Fe and Au nuclei and the deuteron. Our results for RA-RD are consistent with zero for all x, Q2 indicating that possible contributions to R from nuclear higher twist effects and spin-0 constituents in nuclei are not different from those in nucleons. The ratios σA/σD from all recent experiments, at all x, Q2 values, are now in agreement.

© 1994 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevD.49.5641
DOI:
10.1103/PhysRevD.49.5641
PACS:
13.60.Hb, 12.38.Qk, 25.30.Fj