New analysis concerning the strange quark polarization puzzle

The fact that analyses of semi-inclusive deep inelastic scattering suggest that the polarized strange quark density Delta s(x) + Delta s(x) is positive in the measured region of Bjorken x, whereas all analyses of inclusive deep inelastic scattering yield significantly negative values of this quantit...

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Bibliographic Details
Published in:Physical review. D, Particles, fields, gravitation, and cosmology Particles, fields, gravitation, and cosmology, 2015-03, Vol.91 (5), Article 054017
Main Authors: Leader, Elliot, Sidorov, Alexander V., Stamenov, Dimiter B.
Format: Article
Language:English
Subjects:
Asymmetry
Cosmology
Density
Deuterons
Gravitation
Inelastic scattering
Polarization
Quarks
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Summary:The fact that analyses of semi-inclusive deep inelastic scattering suggest that the polarized strange quark density Delta s(x) + Delta s(x) is positive in the measured region of Bjorken x, whereas all analyses of inclusive deep inelastic scattering yield significantly negative values of this quantity, is known as the "strange quark polarization puzzle." We have analyzed the world data on inclusive deep inelastic scattering, including the COMPASS 2010 proton data on the spin asymmetries, and for the first time, the new extremely precise JLab CLAS data on the proton and deuteron spin structure functions. Despite allowing, in our parametrization, for a possible sign change, our results confirm that the inclusive data yield significantly negative values for the polarized strange quark density.
ISSN:1550-7998
1550-2368
DOI:10.1103/PhysRevD.91.054017