! E155 virtual photon asymmetry A2 for the proton and deuteron. ! Beam Energy: 38.80 GeV; Scattering Angle: ~2.75 deg; ! Source: P.L. Anthony, et al., ! "Measurement of the Proton and Deuteron Spin Structure Functions g2 and Asymmetry A2", pg532, ! Phys. Lett. B458: 529-535 (1999). ! ! "x" pertains to the kinematic variable Bjorken x. ! The data presented here use coarse binning from SLAC E143. ! is the statistically weighted average value of x for a particular bin. ! is the statistically weighted average value of the 4-momentum transferred squared. ! A2 is the virtual photon absorption asymmetry. See reference source above for details. ! "stat" is the statistical error on A2. ! The angle (eg. 2.75, 5.5, or 10.5) represents the scattering angle at the ! center of a particular spectrometer's acceptance. It is measured ! relative to the beam direction. The angle "name" of the spectrometer ! is an approximate scattering angle for the electrons detected in that spectrometer. ! Notes: ! !------------------------ ~2.75 deg----------------------------! ! x bin range !----proton---!!---deuteron---! ! low high A2 +-stat A2 +-stat 0.014 0.023 0.022 1.15 0.149 0.111 -0.036 0.074 0.023 0.029 0.026 1.32 -0.020 0.032 0.023 0.021 0.029 0.047 0.039 1.56 -0.034 0.025 0.023 0.017 0.047 0.075 0.062 1.94 0.025 0.033 0.012 0.021 0.075 0.120 0.099 2.34 0.016 0.046 0.040 0.031 0.120 0.193 0.159 2.71 0.033 0.069 0.061 0.047 0.193 0.310 0.255 3.01 0.075 0.107 -0.108 0.076 0.310 0.498 0.411 3.25 -0.004 0.212 0.273 0.166 0.498 0.700 0.621 3.37 -0.842 0.594 0.501 0.503 0.700 0.900 0.796 3.42 -0.294 1.734 -2.329 1.460