Extraction of R=sigma_L/sigma_T from CCFR Neutrino and Antinetrino Differential Cross Sections
/ Authors
A. Bodek, T. Adams, A. Alton, C. Arroyo, S. Avvakumov, L. Debarbaro, P. DeBarbaro, A. Bazarko, R. H.Bernstein, T. Bolton
and 3 more authors
/ Abstract
We report on the extraction of R=sigam_L/sigma_T from CCFR neutrino and antineutrino-Iron differential cross sections. R as measured in neutrno scattering is in agreement with $R$ as measured in muon and electron scattering. All data on R for Q2>1 GeV2 are in agreement with a NNLO QCD calculation which uses NNLO PDFs and includes target mass effects. We report on the first measurements of R in the low x and Q2<1 GeV2 region (where an anomalous large rise in R for nuclear targets has been observed by the HERMES collaboration).