Polarised Deep Inelastic MuonProton Scattering at 200 Gev/c.
Abstract
Available from UMI in association with The British Library. Results are presented for the spin dependent asymmetry parameter A_1 and the structure function g_1 measured in deep inelastic scattering of polarised muons from a polarised ammonia target. The asymmetry has been extracted from data taken at an incident beam energy of 200 GeV and cover the kinematic range of Bjorken scaling variable x from 0.02 to 0.5 and fourmomentum transfer squared, Q^2 from 3 to ~eq60 (GeV/C) ^2. Thus these data greatly extend the kinematic region studied by the experiments performed at SLAC using an electron beam. The asymmetry A_1 is evaluated as a function of xBjorken and Q^2 and is compared to the SLAC data. It is concluded that there is no evidence for scaling violations and that at high x the EMC data are consistent with the SLAC results. At lowx however, the new asymmetry tends to be smaller than predictions from the extrapolation of the 0.94 surdx fit to the SLAC data to the lowx region. The integral of g_1(x) in the interval 0 < x < 1 is evaluated and is compared to the predictions of the Bjorken and EllisJaffe sumrules. It is found that _0int^1g_1(x) dx = 0.11 +/ 0.03 which is two standard deviations lower than the value of 0.174 predicted by the EllisJaffe sumrule.
 Publication:

Ph.D. Thesis
 Pub Date:
 1986
 Bibcode:
 1986PhDT........60J
 Keywords:

 Physics: Elementary Particles and High Energy