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Phys Rev Lett. 2019 Jul 12;123(2):022501. doi: 10.1103/PhysRevLett.123.022501.

Measurements of Nonsinglet Moments of the Nucleon Structure Functions and Comparison to Predictions from Lattice QCD for Q^{2}=4  GeV^{2}.

Author information

1
Hampton University, Hampton, Virginia 23668, USA.
2
Catholic University of America, Washington, DC 20064, USA.
3
University of Chicago, Chicago, Illinois 60637, USA.
4
North Carolina A&T State University, Greensboro, North Carolina 27411, USA.
5
Argonne National Laboratory, Argonne, Illinois 60439, USA.
6
Yerevan Physics Institute, Yerevan 0036, Armenia.
7
Department of Physics and Astronomy, University of Rochester, Rochester, New York 14627, USA.
8
Department of Physics, College of William & Mary, Williamsburg, Virginia 23187, USA.
9
Christopher Newport University, Newport News, Virginia 23606, USA.
10
DFG, German Research Foundation, Bonn 51170, Germany.
11
University of Regina, Regina, Saskatchewan S4S 0A2, Canada.
12
University of Virginia, Charlottesville, Virginia 22904, USA.
13
University of Johannesburg, Auckland Park 2006, Johannesburg, South Africa.
14
University of Houston, Houston, Texas 77004, USA.
15
Florida International University, Miami, Florida 33199, USA.
16
Mississippi State University, Mississippi State, Mississippi 39762, USA.
17
Thomas Jeferson National Accelerator Facility, Newport News, Virginia 23606, USA.
18
Department of Physics, University of Minnesota-Duluth, Duluth, Minnesota 55812, USA.
19
Northwestern University, Evanston, Illinois 60208, USA.
20
Virginia Union University, Richmond, Virginia 23220, USA.
21
University of Colorado, Boulder, Colorado 80309, USA.
22
Duke University, Department of Physics, Box 90305, Durham, North Carolina 27708.
23
Department of Physics, Temple University, Philadelphia, Pennsylvania 19122, USA.
24
Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.
25
James Madison University, Harrisonburg, Virginia 22801, USA.
26
University of Connecticut, Storrs, Connecticut 06269, USA.
27
Norfolk State University, Norfolk, Virginia 23504, USA.
28
Khalifa University of Science and Technology, Abu Dhabi 127788, United Arab Emirates.
29
High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki 305-0801, Japan.
30
University of Zagreb, Zagreb 10000, Croatia.
31
University of Basel, CH-4056 Basel, Switzerland.
32
University of New Hampshire, Durham, New Hampshire 03824, USA.
33
University of Winnipeg, Winnipeg, Manitoba R3B 2E9, Canada.

Abstract

We present extractions of the nucleon nonsinglet moments utilizing new precision data on the deuteron F_{2} structure function at large Bjorken-x determined via the Rosenbluth separation technique at Jefferson Lab Experimental Hall C. These new data are combined with a complementary set of data on the proton previously measured in Hall C at similar kinematics and world datasets on the proton and deuteron at lower x measured at SLAC and CERN. The new Jefferson Lab data provide coverage of the upper third of the x range, crucial for precision determination of the higher moments. In contrast to previous extractions, these moments have been corrected for nuclear effects in the deuteron using a new global fit to the deuteron and proton data. The obtained experimental moments represent an order of magnitude improvement in precision over previous extractions using high x data. Moreover, recent exciting developments in lattice QCD calculations provide a first ever comparison of these new experimental results with calculations of moments carried out at the physical pion mass, as well as a new approach that first calculates the quark distributions directly before determining moments.

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