Recently,a series of new measurements with both the neutral and charge current Drell–Yan processes have been performed at hadron colliders,revealing deviations from the predictions of the current parton distribution ...Recently,a series of new measurements with both the neutral and charge current Drell–Yan processes have been performed at hadron colliders,revealing deviations from the predictions of the current parton distribution functions(PDFs).In this article,the impact of these new measurements is studied by using their results to update the PDFs.Although these new measurements correspond to different boson propagators and colliding energies,they are found to have a similar impact to the light quark parton distributions with a momentum fraction x of approximately 0.1.The deviations are consistent with each other and favor a larger valence d_(v)/u_(v)ratio than the modern PDF predictions.Further study indicates that such tension results dominantly from the deep inelastic scattering measurements of NMC and the fixed target experiments of NuSea,both of which play pivotal roles in detecting the relative u-and d-type quark contributions for modern PDFs.The conclusions of the impact study indicate that these new measurements should be included in the complete PDF global analysis in the future.展开更多
基金Supported by the National Natural Science Foundation of China(12061141005,12105275)。
文摘Recently,a series of new measurements with both the neutral and charge current Drell–Yan processes have been performed at hadron colliders,revealing deviations from the predictions of the current parton distribution functions(PDFs).In this article,the impact of these new measurements is studied by using their results to update the PDFs.Although these new measurements correspond to different boson propagators and colliding energies,they are found to have a similar impact to the light quark parton distributions with a momentum fraction x of approximately 0.1.The deviations are consistent with each other and favor a larger valence d_(v)/u_(v)ratio than the modern PDF predictions.Further study indicates that such tension results dominantly from the deep inelastic scattering measurements of NMC and the fixed target experiments of NuSea,both of which play pivotal roles in detecting the relative u-and d-type quark contributions for modern PDFs.The conclusions of the impact study indicate that these new measurements should be included in the complete PDF global analysis in the future.
