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Phys Rev Lett. 2018 Feb 9;120(6):062501. doi: 10.1103/PhysRevLett.120.062501.

Measurement of the Q^{2} Dependence of the Deuteron Spin Structure Function g_{1} and its Moments at Low Q^{2} with CLAS.

Adhikari KP1,2,3, Deur A2,4, El Fassi L1,3, Kang H5, Kuhn SE1, Ripani M6, Slifer K4,7, Zheng X4, Adhikari S8, Akbar Z9, Amaryan MJ1, Avakian H2, Ball J10, Balossino I11, Barion L11, Battaglieri M6, Bedlinskiy I12, Biselli AS13, Bosted P14, Briscoe WJ15, Brock J2, Bültmann S1, Burkert VD2, Thanh Cao F16, Carlin C2, Carman DS2, Celentano A6, Charles G1, Chen JP2, Chetry T17, Choi S5, Ciullo G11, Clark L18, Cole PL2,19, Contalbrigo M11, Crede V9, D'Angelo A20,21, Dashyan N22, De Vita R6, De Sanctis E23, Defurne M10, Djalali C24, Dodge GE1, Drozdov V6,25, Dupre R26, Egiyan H2,7, El Alaoui A27, Elouadrhiri L2, Eugenio P9, Fedotov G17,25, Filippi A28, Ghandilyan Y22, Gilfoyle GP29, Golovatch E25, Gothe RW24, Griffioen KA14, Guidal M26, Guler N1, Guo L2,8, Hafidi K30, Hakobyan H22,27, Hanretty C2, Harrison N2, Hattawy M30, Heddle D2,31, Hicks K17, Holtrop M7, Hyde CE1, Ilieva Y15,24, Ireland DG18, Isupov EL25, Jenkins D32, Jo HS26, Johnston SC30, Joo K16, Joosten S33, Kabir ML3, Keith CD2, Keller D4, Khachatryan G22, Khachatryan M1, Khandaker M19,34, Kim W35, Klein A1, Klein FJ36, Konczykowski P10, Kovacs K4, Kubarovsky V2,37, Lanza L20, Lenisa P11, Livingston K18, Long E7, MacGregor IJD18, Markov N16, Mayer M1, McKinnon B18, Meekins DG2, Meyer CA38, Mineeva T27, Mirazita M23, Mokeev V2,25, Movsisyan A11, Munoz Camacho C26, Nadel-Turonski P2,15, Niculescu G17,39, Niccolai S26, Osipenko M6, Ostrovidov AI9, Paolone M33, Pappalardo L11,40, Paremuzyan R7, Park K2,35, Pasyuk E2,41, Payette D1, Phelps W8, Phillips SK7, Pierce J4, Pogorelko O12, Poudel J1, Price JW42, Prok Y1,4, Protopopescu D18, Raue BA2,8, Rizzo A20,21, Rosner G18, Rossi P2,23, Sabatié F10, Salgado C34, Schumacher RA38, Sharabian YG2, Shigeyuki T4, Simonyan A26, Skorodumina I24,25, Smith GD43, Sparveris N33, Sokhan D18, Stepanyan S2, Strakovsky II15, Strauch S24, Sulkosky V14, Taiuti M6,44, Tan JA35, Ungaro M2,37, Voutier E26, Wei X2, Weinstein LB1, Zhang J1,4, Zhao ZW1,24; CLAS Collaboration.

Author information

1
Old Dominion University, Norfolk, Virginia 23529, USA.
2
Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA.
3
Mississippi State University, Mississippi State, Mississippi 39762-5167, USA.
4
University of Virginia, Charlottesville, Virginia 22901, USA.
5
Seoul National University, Seoul, Korea.
6
INFN, Sezione di Genova, 16146 Genova, Italy.
7
University of New Hampshire, Durham, New Hampshire 03824-3568, USA.
8
Florida International University, Miami, Florida 33199, USA.
9
Florida State University, Tallahassee, Florida 32306, USA.
10
IRFU, CEA, Universit'e Paris-Saclay, F-91191 Gif-sur-Yvette, France.
11
INFN, Sezione di Ferrara, 44100 Ferrara, Italy.
12
Institute of Theoretical and Experimental Physics, Moscow, 117259, Russia.
13
Fairfield University, Fairfield, Connecticut 06824, USA.
14
College of William and Mary, Williamsburg, Virginia 23187-8795, USA.
15
The George Washington University, Washington, DC 20052, USA.
16
University of Connecticut, Storrs, Connecticut 06269, USA.
17
Ohio University, Athens, Ohio 45701, USA.
18
University of Glasgow, Glasgow G12 8QQ, United Kingdom.
19
Idaho State University, Pocatello, Idaho 83209, USA.
20
INFN, Sezione di Roma Tor Vergata, 00133 Rome, Italy.
21
Universita' di Roma Tor Vergata, 00133 Rome Italy.
22
Yerevan Physics Institute, 375036 Yerevan, Armenia.
23
INFN, Laboratori Nazionali di Frascati, 00044 Frascati, Italy.
24
University of South Carolina, Columbia, South Carolina 29208, USA.
25
Skobeltsyn Institute of Nuclear Physics, Lomonosov Moscow State University, 119234 Moscow, Russia.
26
Institut de Physique Nucléaire, CNRS/IN2P3 and Université Paris Sud, Orsay, France.
27
Universidad Técnica Federico Santa María, Casilla 110-V Valparaíso, Chile.
28
INFN, Sezione di Torino, 10125 Torino, Italy.
29
University of Richmond, Richmond, Virginia 23173, USA.
30
Argonne National Laboratory, Argonne, Illinois 60439, USA.
31
Christopher Newport University, Newport News, Virginia 23606, USA.
32
Virginia Tech, Blacksburg, Virginia 24061-0435, USA.
33
Temple University, Philadelphia, Pennsylvania 19122, USA.
34
Norfolk State University, Norfolk, Virginia 23504, USA.
35
Kyungpook National University, Daegu 41566, Republic of Korea.
36
Catholic University of America, Washington, DC 20064, USA.
37
Rensselaer Polytechnic Institute, Troy, New York 12180-3590, USA.
38
Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA.
39
James Madison University, Harrisonburg, Virginia 22807, USA.
40
Università di Ferrara, 44121 Ferrara, Italy.
41
Arizona State University, Tempe, Arizona 85287-1504, USA.
42
California State University, Dominguez Hills, Carson, California 90747, USA.
43
Edinburgh University, Edinburgh EH9 3JZ, United Kingdom.
44
Università di Genova, Dipartimento di Fisica, 16146 Genova, Italy.

Abstract

We measured the g_{1} spin structure function of the deuteron at low Q^{2}, where QCD can be approximated with chiral perturbation theory (χPT). The data cover the resonance region, up to an invariant mass of W≈1.9  GeV. The generalized Gerasimov-Drell-Hearn sum, the moment Γ_{1}^{d} and the spin polarizability γ_{0}^{d} are precisely determined down to a minimum Q^{2} of 0.02  GeV^{2} for the first time, about 2.5 times lower than that of previous data. We compare them to several χPT calculations and models. These results are the first in a program of benchmark measurements of polarization observables in the χPT domain.

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