! E155 virtual photon asymmetry A2 for the proton and deuteron. ! Beam Energy: 38.80 GeV; Scattering Angle: ~5.5 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: ! !------------------------ ~5.5 deg----------------------------! ! x bin range !----proton---!!---deuteron---! ! low high A2 +-stat A2 +-stat 0.047 0.075 0.072 3.68 0.185 0.177 -0.177 0.117 0.075 0.120 0.104 4.84 -0.041 0.037 0.034 0.024 0.120 0.193 0.161 6.26 0.019 0.032 0.007 0.022 0.193 0.310 0.256 7.76 0.098 0.044 0.048 0.033 0.310 0.498 0.417 9.20 -0.004 0.079 -0.030 0.063 0.498 0.700 0.625 10.23 0.021 0.211 -0.011 0.186 0.700 0.900 0.828 10.76 -0.298 0.701 1.102 0.603