! E155 Inclusive pion asymmetries A_LL for the deuteron. ! Beam Energy: 48.35 GeV; Scattering Angle: ~5.5 deg; ! Source: T.S. Toole, "A Precision Measurement of the Spin Structure ! Functions g1p and g1d", pg200, ! Doctoral Dissertation, American University (2000) unpublished.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 deuteron at ~5.5 ------! ! p(GeV) ~5.5 pi^(-) ~5.5 pi^(+) ! A_LL +-stat A_LL +-stat 16.0 -0.017 0.033 0.056 0.060 17.0 0.035 0.035 0.126 0.064 18.0 -0.026 0.042 -0.065 0.076 19.0 0.018 0.050 -0.005 0.093 20.0 0.056 0.061 -0.032 0.116 21.0 -0.071 0.074 -0.169 0.149 22.0 -0.006 0.091 0.082 0.188 23.0 0.123 0.104 --- --- 24.0 -0.026 0.121 --- ---