Measurement of the Tensor Structure Function b{sub 1} of the Deuteron

Journal Article · Fri Dec 09 04:00:00 EST 2005 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.95.242001· OSTI ID:20699668

Airapetian, A; Akopov, N; Akopov, Z; Avakian, R; Avetissian, A; Elbakian, G; Gharibyan, V; Marukyan, H; Rostomyan, A; Taroian, S ^[1]; Amarian, M ^[2]; Ammosov, V V; Bryzgalov, V; Gapienko, G; Gapienko, V; Ivanilov, A; Korotkov, V; Salomatin, Y; Tchuiko, B ^[3]; Andrus, A ^[4]

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1. Yerevan Physics Institute, 375036 Yerevan (Armenia)
2. DESY, 15738 Zeuthen (Germany)
3. Institute for High Energy Physics, Protvino, 142281 (Russian Federation)
4. Department of Physics, University of Illinois, Urbana, Illinois 61801-3080 (United States); and others

The Hermes experiment has investigated the tensor spin structure of the deuteron using the 27.6 GeV/c positron beam of DESY HERA. The use of a tensor-polarized deuteron gas target with only a negligible residual vector polarization enabled the first measurement of the tensor asymmetry A{sub zz}{sup d} and the tensor structure function b{sub 1}{sup d} for average values of the Bjorken variable 0.01<<x><0.45 and of the negative of the squared four-momentum transfer 0.5 GeV{sup 2}<<Q{sup 2}><5 GeV{sup 2}. The quantities A{sub zz}{sup d} and b{sub 1}{sup d} are found to be nonzero. The rise of b{sub 1}{sup d} for decreasing values of x can be interpreted to originate from the same mechanism that leads to nuclear shadowing in unpolarized scattering.

• OSTI ID: 20699668
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 24 Vol. 95; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ASYMMETRY
DEEP INELASTIC SCATTERING
DESY
DEUTERONS
FOUR MOMENTUM TRANSFER
GEV RANGE 10-100
HERA STORAGE RING
POLARIZATION
POSITRON BEAMS
SPIN
STRUCTURE FUNCTIONS