Extended Data Fig. 1: Comparison of NuSea and SeaQuest data with NLO calculations.
a, b, Comparison of the data from the present work and the NuSea measurements with NLO calculations made at the integrated kinematics of SeaQuest (a) and average kinematics of NuSea (b) based on the CT18 and CTEQ6m parton distributions. Events in the SeaQuest data were produced by a 120-GeV proton beam, whereas in the NuSea data were from an 800-GeV beam. In addition, the spectrometers, although similar in concept, had different acceptances. As a consequence, the cross-section ratios, which convolve xt with xb, are expected to differ because of their distinct distributions in accepted xb. These kinematic effects can clearly be seen by the difference between the curves. Because an acceptance table analogous to Extended Data Table 3 was not available for NuSea, those calculations used ⟨xt⟩, ⟨xb⟩ and ⟨M⟩ of the NuSea data. Both CTEQ6m and CT18 have included the NuSea data in their global analysis, so calculations based on those probability distribution functions are expected to agree better with the NuSea data. The red (violet) curve in a (b) is the same as that in Fig. 1a and is repeated here for comparison.
