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

Abstract

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.

Authors:
; ; ; ; ; ; ; ; ;  [1];  [2];  [3]; ; ; ; ; ; ; ;  [4] more »;  [5] « less
  1. Yerevan Physics Institute, 375036 Yerevan (Armenia)
  2. DESY, 15738 Zeuthen (Germany)
  3. (Armenia)
  4. Institute for High Energy Physics, Protvino, 142281 (Russian Federation)
  5. Department of Physics, University of Illinois, Urbana, Illinois 61801-3080 (United States) [and others
Publication Date:
OSTI Identifier:
20699668
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review Letters; Journal Volume: 95; Journal Issue: 24; Other Information: DOI: 10.1103/PhysRevLett.95.242001; (c) 2005 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA). HERMES Collaboration
Country of Publication:
United States
Language:
English
Subject:
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

Citation Formats

Airapetian, A., Akopov, N., Akopov, Z., Avakian, R., Avetissian, A., Elbakian, G., Gharibyan, V., Marukyan, H., Rostomyan, A., Taroian, S., Amarian, M., Yerevan Physics Institute, 375036 Yerevan, Ammosov, V.V., Bryzgalov, V., Gapienko, G., Gapienko, V., Ivanilov, A., Korotkov, V., Salomatin, Y., Tchuiko, B., and Andrus, A.. Measurement of the Tensor Structure Function b{sub 1} of the Deuteron. United States: N. p., 2005. Web. doi:10.1103/PhysRevLett.95.242001.
Airapetian, A., Akopov, N., Akopov, Z., Avakian, R., Avetissian, A., Elbakian, G., Gharibyan, V., Marukyan, H., Rostomyan, A., Taroian, S., Amarian, M., Yerevan Physics Institute, 375036 Yerevan, Ammosov, V.V., Bryzgalov, V., Gapienko, G., Gapienko, V., Ivanilov, A., Korotkov, V., Salomatin, Y., Tchuiko, B., & Andrus, A.. Measurement of the Tensor Structure Function b{sub 1} of the Deuteron. United States. doi:10.1103/PhysRevLett.95.242001.
Airapetian, A., Akopov, N., Akopov, Z., Avakian, R., Avetissian, A., Elbakian, G., Gharibyan, V., Marukyan, H., Rostomyan, A., Taroian, S., Amarian, M., Yerevan Physics Institute, 375036 Yerevan, Ammosov, V.V., Bryzgalov, V., Gapienko, G., Gapienko, V., Ivanilov, A., Korotkov, V., Salomatin, Y., Tchuiko, B., and Andrus, A.. Fri . "Measurement of the Tensor Structure Function b{sub 1} of the Deuteron". United States. doi:10.1103/PhysRevLett.95.242001.
@article{osti_20699668,
title = {Measurement of the Tensor Structure Function b{sub 1} of the Deuteron},
author = {Airapetian, A. and Akopov, N. and Akopov, Z. and Avakian, R. and Avetissian, A. and Elbakian, G. and Gharibyan, V. and Marukyan, H. and Rostomyan, A. and Taroian, S. and Amarian, M. and Yerevan Physics Institute, 375036 Yerevan and Ammosov, V.V. and Bryzgalov, V. and Gapienko, G. and Gapienko, V. and Ivanilov, A. and Korotkov, V. and Salomatin, Y. and Tchuiko, B. and Andrus, A.},
abstractNote = {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.},
doi = {10.1103/PhysRevLett.95.242001},
journal = {Physical Review Letters},
number = 24,
volume = 95,
place = {United States},
year = {Fri Dec 09 00:00:00 EST 2005},
month = {Fri Dec 09 00:00:00 EST 2005}
}