Extraction of R=sigma_L/sigma_T from CCFR Neutrino and Antinetrino Differential Cross Sections

Bodek, A.; Adams, T.; Alton, A.; Arroyo, C. G.; Avvakumov, S.; deBarbaro, L.; deBarbaro, P.; Bazarko, A. O.; Bernstein, R. H.; Bolton, T.; Brau, J.; Buchholz, D.

Extraction of R=sigma_L/sigma_T from CCFR Neutrino and Antinetrino Differential Cross Sections

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Description

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).
4 pages, 1 figure. Presented by Arie Bodek for the CCFR/NuTeV collaboration at DIS2001, Bologna, April 2001 (to be published in Proceedings). UR-1635