Spin structure function of deuteron g1 d from COMPASS
Tóm tắt
New results on the longitudinal inclusive spin asymmetry A
1
d in the range 1 < Q
2 < 100(GeV/c)^2 and 0.004 < x < 0.7 are presented. From these results we derive the spin-dependent structure function g
1
d which we use to evaluate the scale-invariant flavor-singlet axial charge
$ \hat{{a}}_{0}^{}$
. The contribution of the measured region is evaluated by a QCD fit of the world data. The data were obtained by the COMPASS experiment at CERN using a 160GeV polarized muon beam scattered off a large double-cell polarized 6LiD target. The results are in agreement with those from previous experiments and improve considerably the statistical accuracy in the region x < 0.03.
Tài liệu tham khảo
S.D. Bass, Rev. Mod. Phys. 77, 1257 (2005).
COMPASS proposal CERN/SPSLC 96-14 (Geneva, 1996).
E155 Collaboration (P.L. Anthony), Phys. Lett. B 553, 18 (2003).
COMPASS Collaboration (E.S. Ageev), Phys. Lett. B 612, 154 (2005).
SMC Collaboration (B. Adeva), Phys. Rev. D 58, 112001 (1998).
HERMES Collaboration (A. Airapetian), Phys. Rev. D 75, 012003 (2005).
E143 Collaboration (K. Abe), Phys. Rev. D 58, 112003 (1998).
E155 Collaboration (P.L. Anthony), Phys. Lett. B 463, 339 (1999).
S.A. Larin, Phys. Lett. B 404, 153 (1997).
HEP Databases, http://durpdg.dur.ac.uk/HEPDATA/ pdf.html.
J. Blümlein, H. Böttcher, Nucl. Phys. B 636, 225 (2002).
M. Glück, Phys. Rev. D 63, 094005 (2001).
E. Leader, A.V. Sidorov, D.B. Stamenov, Phys. Rev. D 73, 034023 (2006).
R. Machleidt, Phys. Rep. 149, 1 (1987).
EMC Collaboration (J. Ashman), Nucl. Phys. B 328, 1 (1989).
E155 Collaboration (P.L. Anthony), Phys. Lett. B 493, 19 (2000).
E142 Collaboration (P.L. Anthony), Phys. Rev. D 54, 6620 (1996)
SMC Collaboration (B. Adeva), Phys. Rev. D 58, 112002 (1998).
A.N. Sissakian, O. Yu. Shevchenko, O.N. Ivanov, Phys. Rev. D 70, 074032 (2004).
Y. Goto, Phys. Rev. D 62, 034017 (2000).