! E155 spin structure function xg2 for the proton and deuteron. ! Beam Energy: 38.80 GeV. ! Source: E155 Collaboration (P.L. Anthony, et al.), ! "Measurement of the Proton and Deuteron Spin Structure Functions g2 ! and Asymmetry A2", pg532Phys. 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. ! g2 is the spin structure function. ! See reference source above for details. ! "stat" is the statistical error on g2. ! 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. ! !------------- xg2 for the three E155 Spectrometers ------------------! ! spect x bin range !----proton---!!---deuteron---! ! low high xg2 +-stat xg2 +-stat 2 0.014 0.023 0.022 1.15 0.439 0.335 -0.103 0.212 2 0.023 0.029 0.026 1.32 -0.069 0.088 0.060 0.056 2 0.029 0.047 0.039 1.56 -0.090 0.057 0.043 0.035 2 0.047 0.075 0.062 1.94 0.024 0.054 0.013 0.034 2 0.075 0.120 0.099 2.34 -0.020 0.054 0.041 0.034 2 0.120 0.193 0.159 2.71 -0.021 0.056 0.024 0.035 2 0.193 0.310 0.255 3.01 -0.008 0.056 -0.077 0.035 2 0.310 0.498 0.411 3.25 -0.049 0.056 0.032 0.036 2 0.498 0.700 0.621 3.37 -0.123 0.054 0.019 0.035 2 0.700 0.900 0.796 3.42 -0.019 0.042 -0.043 0.024 5 0.047 0.075 0.072 3.68 0.367 0.370 -0.353 0.231 5 0.075 0.120 0.104 4.84 -0.102 0.064 0.050 0.040 5 0.120 0.193 0.161 6.26 -0.022 0.042 -0.007 0.027 5 0.193 0.310 0.256 7.76 0.030 0.039 0.018 0.025 5 0.310 0.498 0.417 9.20 -0.059 0.034 -0.032 0.022 5 0.498 0.700 0.625 10.23 -0.027 0.026 -0.015 0.017 5 0.700 0.900 0.828 10.76 -0.010 0.014 0.012 0.008 10 0.120 0.193 0.168 9.77 0.011 0.115 -0.118 0.070 10 0.193 0.310 0.258 13.70 -0.001 0.070 -0.016 0.043 10 0.310 0.498 0.432 20.06 0.006 0.045 -0.013 0.029 10 0.498 0.700 0.643 25.46 0.005 0.020 0.030 0.015 10 0.700 0.900 0.841 29.25 0.008 0.006 -0.006 0.004