Uncertainty of parton distribution functions due to physical observables in a global analysis

  • The recent measurement of the differential γ+c-jet cross section, performed at the Tevatron collider in Run II by the D0 collaboration, is studied in a next-to-leading order (NLO) global QCD analysis to assess its impact on the proton parton distribution functions (PDFs). We show that these data lead to a significant change in the gluon and charm quark distributions. We demonstrate also that there is an inconsistency between the new high precision HERA I+II combined data and Tevatron measurement. Moreover, in this study we investigate the impact of older EMC measurements of charm structure function Fc2 on the PDFs and compare the results with those from the analysis of Tevatron data. We show that both of them have the same impact on the PDFs, and thus can be recognized as the same evidence for the inefficiency of perturbative QCD in dealing with charm production in some kinematic regions.
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Alireza Aleedaneshvar, Muhammad Goharipour and Saeedeh Rostami. Uncertainty of parton distribution functions due to physical observables in a global analysis[J]. Chinese Physics C, 2017, 41(2): 023101. doi: 10.1088/1674-1137/41/2/023101
Alireza Aleedaneshvar, Muhammad Goharipour and Saeedeh Rostami. Uncertainty of parton distribution functions due to physical observables in a global analysis[J]. Chinese Physics C, 2017, 41(2): 023101.  doi: 10.1088/1674-1137/41/2/023101 shu
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Received: 2016-09-05
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Uncertainty of parton distribution functions due to physical observables in a global analysis

Abstract: The recent measurement of the differential γ+c-jet cross section, performed at the Tevatron collider in Run II by the D0 collaboration, is studied in a next-to-leading order (NLO) global QCD analysis to assess its impact on the proton parton distribution functions (PDFs). We show that these data lead to a significant change in the gluon and charm quark distributions. We demonstrate also that there is an inconsistency between the new high precision HERA I+II combined data and Tevatron measurement. Moreover, in this study we investigate the impact of older EMC measurements of charm structure function Fc2 on the PDFs and compare the results with those from the analysis of Tevatron data. We show that both of them have the same impact on the PDFs, and thus can be recognized as the same evidence for the inefficiency of perturbative QCD in dealing with charm production in some kinematic regions.

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