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Title: First lattice QCD study of the gluonic structure of light nuclei

Abstract

The role of gluons in the structure of the nucleon and light nuclei is investigated using lattice quantum chromodynamics (QCD) calculations. The first moment of the unpolarised gluon distribution is studied in nuclei up to atomic number $A=3$ at quark masses corresponding to pion masses of $$m_\pi\sim 450$$ and $806$ MeV. Nuclear modification of this quantity defines a gluonic analogue of the EMC effect and is constrained to be less than $$\sim 10$$% in these nuclei. This is consistent with expectations from phenomenological quark distributions and the momentum sum rule. In the deuteron, the combination of gluon distributions corresponding to the $$b_1$$ structure function is found to have a small first moment compared with the corresponding momentum fraction. The first moment of the gluon transversity structure function is also investigated in the spin-1 deuteron, where a non-zero signal is observed at $$m_\pi \sim 806$$ MeV. In conclusion, this is the first indication of gluon contributions to nuclear structure that can not be associated with an individual nucleon.

Authors:
 [1];  [2];  [3];  [4];  [5];  [6];  [7]
  1. Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
  2. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
  3. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  4. College of William and Mary, Williamsburg, VA (United States); Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
  5. Univ. of Washington, Seattle, WA (United States)
  6. College of William and Mary, Williamsburg, VA (United States); Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States); Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
  7. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States); Univ. of Washington, Seattle, WA (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Oak Ridge Leadership Computing Facility (OLCF); Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26); USDOE Office of Science (SC), Biological and Environmental Research (BER) (SC-23)
Contributing Org.:
NPLQCD Collaboration
OSTI Identifier:
1411418
Alternate Identifier(s):
OSTI ID: 1410480; OSTI ID: 1438748; OSTI ID: 1493279
Report Number(s):
JLAB-THY-17-2540; DOE/OR/23177-4204; arXiv:1709.00395; LLNL-JRNL-737744
Journal ID: ISSN 2470-0010; PRVDAQ; TRN: US1800231
Grant/Contract Number:  
NSF PHY11-25915; 0922770; AC02-05CH11231; AC05-00OR22725; FG02-00ER41132; SC0010337; AC52-07NA27344
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review D
Additional Journal Information:
Journal Volume: 96; Journal Issue: 9; Journal ID: ISSN 2470-0010
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; 73 NUCLEAR PHYSICS AND RADIATION PHYSICS

Citation Formats

Winter, Frank, Detmold, William, Gambhir, Arjun S., Orginos, Kostas, Savage, Martin J., Shanahan, Phiala E., and Wagman, Michael L. First lattice QCD study of the gluonic structure of light nuclei. United States: N. p., 2017. Web. doi:10.1103/PhysRevD.96.094512.
Winter, Frank, Detmold, William, Gambhir, Arjun S., Orginos, Kostas, Savage, Martin J., Shanahan, Phiala E., & Wagman, Michael L. First lattice QCD study of the gluonic structure of light nuclei. United States. doi:10.1103/PhysRevD.96.094512.
Winter, Frank, Detmold, William, Gambhir, Arjun S., Orginos, Kostas, Savage, Martin J., Shanahan, Phiala E., and Wagman, Michael L. Tue . "First lattice QCD study of the gluonic structure of light nuclei". United States. doi:10.1103/PhysRevD.96.094512. https://www.osti.gov/servlets/purl/1411418.
@article{osti_1411418,
title = {First lattice QCD study of the gluonic structure of light nuclei},
author = {Winter, Frank and Detmold, William and Gambhir, Arjun S. and Orginos, Kostas and Savage, Martin J. and Shanahan, Phiala E. and Wagman, Michael L.},
abstractNote = {The role of gluons in the structure of the nucleon and light nuclei is investigated using lattice quantum chromodynamics (QCD) calculations. The first moment of the unpolarised gluon distribution is studied in nuclei up to atomic number $A=3$ at quark masses corresponding to pion masses of $m_\pi\sim 450$ and $806$ MeV. Nuclear modification of this quantity defines a gluonic analogue of the EMC effect and is constrained to be less than $\sim 10$% in these nuclei. This is consistent with expectations from phenomenological quark distributions and the momentum sum rule. In the deuteron, the combination of gluon distributions corresponding to the $b_1$ structure function is found to have a small first moment compared with the corresponding momentum fraction. The first moment of the gluon transversity structure function is also investigated in the spin-1 deuteron, where a non-zero signal is observed at $m_\pi \sim 806$ MeV. In conclusion, this is the first indication of gluon contributions to nuclear structure that can not be associated with an individual nucleon.},
doi = {10.1103/PhysRevD.96.094512},
journal = {Physical Review D},
number = 9,
volume = 96,
place = {United States},
year = {2017},
month = {11}
}

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