Deep Inelastic Structure Functions from Electron Scattering on Hydrogen, Deuterium, and Iron at 0. 6 GeV Sup 2 Le Q Sup 2 Le 30. 0 GeV Sup 2 PDF Download

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Languages : en
Pages : 203

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Book Description
We report the final results from experiment E140, a recent deep inelastic electron-deuterium and electron-iron scattering experiment at SLAC. In addition, we present the results of a combined global analysis of all SLAC deep inelastic electron-hydrogen and electron-deuterium cross section measurements between 1970 and 1983. Data from seven earlier experiments are re-radiatively corrected and normalized to experiment E140. We report extractions of R(x, Q2) and F2(x, Q2) for hydrogen and deuterium over the entire SLAC kinematic range: .06(less-than or equal to) x (less-than or equal to).90 and 0.6(less-than or equal to) Q2 (less-than or equal to)30.0 (GeV2). We fine that R{sup p} = R{sup d}, as expected by QCD. Extracted values of R(x, Q2) are significantly larger than predictions based on QCD and on QCD with the inclusion of kinematic target mass terms. This difference indicates that dynamical higher twist effects may be important in the SLAC kinematic range. A best fit empirical model of R(x, Q2) is used to extract F2 from each cross section measurement. These F2 extractions are compared with F2 data from EMC and BCDMS. Agreement is observed with EMC when the EMC data are multiplied by 1.07. Agreement is observed with BCDMS over a limited range in x. The ratios of F2{sup d}/F2{sup p} are examined for Q2 dependence. We observe a significant negative slope for x (less-than or equal to) .6, and a significant positive slope above x> .7, in excellent agreement with predictions based on QCD with the inclusion of kinematic target mass terms. 111 refs., 40 figs., 34 tabs.