Constraints on charm-anticharm asymmetry in the nucleon from lattice QCD

Raza Sabbir Sufian, Tianbo Liu, Andrei Alexandru, Stanley J. Brodsky, Guy F. de Téramond, Hans Günter Dosch, Terrence Draper, Keh Fei Liu, Yi Bo Yang

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Abstract

We present the first lattice QCD calculation of the charm quark contribution to the nucleon electromagnetic form factors GE,Mc(Q2) in the momentum transfer range 0≤Q2≤1.4 GeV2. The quark mass dependence, finite lattice spacing and volume corrections are taken into account simultaneously based on the calculation on three gauge ensembles including one at the physical pion mass. The nonzero value of the charm magnetic moment μMc=−0.00127(38)stat(5)sys, as well as the Pauli form factor, reflects a nontrivial role of the charm sea in the nucleon spin structure. The nonzero GEc(Q2) indicates the existence of a nonvanishing asymmetric charm-anticharm sea in the nucleon. Performing a nonperturbative analysis based on holographic QCD and the generalized Veneziano model, we study the constraints on the [c(x)−c¯(x)] distribution from the lattice QCD results presented here. Our results provide complementary information and motivation for more detailed studies of physical observables that are sensitive to intrinsic charm and for future global analyses of parton distributions including asymmetric charm-anticharm distribution.

Original languageEnglish
Article number135633
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume808
DOIs
StatePublished - Sep 10 2020

Bibliographical note

Funding Information:
RSS thanks Jeremy R. Green, Luka Leskovec, Jian-Wei Qiu, Anatoly V. Radyushkin, and David G. Richards for useful discussions. The authors thank the RBC/UKQCD collaborations for providing their DWF gauge configurations. This work is supported by the U.S. Department of Energy , Office of Science, Office of Nuclear Physics under contract DE-AC05-06OR23177 . A. Alexandru is supported in part by U.S. DOE Award Number DE-FG02-95ER40907 . T. Draper and K.F. Liu are supported in part by DOE Award Number DE-SC0013065 . Y. Yang is supported by Strategic Priority Research Program of Chinese Academy of Sciences , Grant No. XDC01040100 . This research used resources of the Oak Ridge Leadership Computing Facility at the Oak Ridge National Laboratory, which is supported by the Office of Science of the U.S. Department of Energy under Contract No. DE-AC05-00OR22725 . This work used Stampede time under the Extreme Science and Engineering Discovery Environment (XSEDE), which is supported by National Science Foundation grant number ACI-1053575 . We also thank the National Energy Research Scientific Computing Center (NERSC) for providing HPC resources that have contributed to the research results reported within this paper. We acknowledge the facilities of the USQCD Collaboration used for this research in part, which are funded by the Office of Science of the U.S. Department of Energy .

Funding Information:
RSS thanks Jeremy R. Green, Luka Leskovec, Jian-Wei Qiu, Anatoly V. Radyushkin, and David G. Richards for useful discussions. The authors thank the RBC/UKQCD collaborations for providing their DWF gauge configurations. This work is supported by the U.S. Department of Energy, Office of Science, Office of Nuclear Physics under contract DE-AC05-06OR23177. A. Alexandru is supported in part by U.S. DOE Award Number DE-FG02-95ER40907. T. Draper and K.F. Liu are supported in part by DOE Award Number DE-SC0013065. Y. Yang is supported by Strategic Priority Research Program of Chinese Academy of Sciences, Grant No. XDC01040100. This research used resources of the Oak Ridge Leadership Computing Facility at the Oak Ridge National Laboratory, which is supported by the Office of Science of the U.S. Department of Energy under Contract No. DE-AC05-00OR22725. This work used Stampede time under the Extreme Science and Engineering Discovery Environment (XSEDE), which is supported by National Science Foundation grant number ACI-1053575. We also thank the National Energy Research Scientific Computing Center (NERSC) for providing HPC resources that have contributed to the research results reported within this paper. We acknowledge the facilities of the USQCD Collaboration used for this research in part, which are funded by the Office of Science of the U.S. Department of Energy.

Publisher Copyright:
© 2020 The Author(s)

Keywords

  • Form factor
  • Intrinsic charm
  • Lattice QCD
  • Light-front holographic QCD
  • Parton distributions

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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