! E155 Inclusive hadron asymmetries A_LL for the proton. ! Beam Energy: 48.35 GeV; Scattering Angle: ~2.75 deg; ! Source: T.S. Toole, "A Precision Measurement of the Spin Structure ! Functions g1p and g1d", pg197, ! Doctoral Dissertation, American University (2000) unpublished. ! ! p is the momentum of the detected particle. ! A_LL is the inclusive hadron asymmetry, defined as ! (antiparallel - parallel) / (antiparallel + parallel) ! where antiparallel (parallel) refers to the number of events counted, normalized to ! incident beam charge, when the spins of the incident electrons and the target ! nucleons were anti-aligned (aligned). ! "stat" is the statistical error. ! The angle (eg. theta = 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. ! h^(+) indicates when the detected particle was a positively charged hadron. ! h^(-) " " " " " " " negatively " " . ! pi^(+) " " " " " " " positively " pion. ! pi^(-) " " " " " " " negatively " pion. ! Notes: These data differ slightly from those presented in Phys. Lett. B458:536-544,(1999) ! (aka, the E155 Hadron Paper). The differences are primarily due to: ! (1) The inclusion of additional runs. ! (2) These data take advantage of the final corrections to the proton polarization. ! !--------- A_LL(p) for proton at ~2.75------! ! p(GeV) ~2.75 h^(-) ~2.75 h^(+) ! A_LL +-stat A_LL +-stat 10.0 0.004 0.002 0.012 0.005 11.0 0.006 0.002 0.010 0.005 12.0 0.005 0.002 0.012 0.005 13.0 0.006 0.002 0.013 0.006 14.0 0.009 0.003 0.008 0.006 15.0 0.007 0.003 0.010 0.007 16.0 0.009 0.003 0.026 0.008 17.0 0.008 0.004 0.018 0.009 18.0 0.011 0.004 0.023 0.010 19.0 0.013 0.005 0.018 0.013 20.0 0.006 0.006 0.023 0.015 21.0 0.013 0.007 0.012 0.018 22.0 0.007 0.009 0.015 0.021 23.0 0.006 0.010 0.021 0.025 24.0 0.007 0.012 0.044 0.030 25.0 -0.005 0.014 0.045 0.036 26.0 0.017 0.016 0.066 0.042 27.0 0.035 0.018 0.003 0.049 28.0 0.048 0.020 0.141 0.058 29.0 0.047 0.023 --- ---