Measurement of Parton Distributions of Strange Quarks in the Nucleon from Charged-Kaon Production in Deep-Inelastic Scattering on the Deuteron - INSPIRE

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Measurement of Parton Distributions of Strange Quarks in the Nucleon from Charged-Kaon Production in Deep-Inelastic Scattering on the Deuteron

HERMES

Collaboration

•

A. Airapetian
(
- Michigan U.
)

Mar, 2008

5 pages

Published in:

Phys.Lett.B 666 (2008) 446-450

e-Print:

0803.2993 [hep-ex]

DOI:

10.1016/j.physletb.2008.07.090

Report number:

DESY-07-223

Experiments:

DESY-HERA-HERMES

View in:

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Abstract: (Elsevier)

The momentum and helicity density distributions of the strange quark sea in the nucleon are obtained in leading order from charged-kaon production in deep-inelastic scattering on the deuteron. The distributions are extracted from spin-averaged K± multiplicities, and from K± and inclusive double-spin asymmetries for scattering of polarized positrons by a polarized deuterium target. The shape of the momentum distribution is softer than that of the average of the u¯ and d¯ quarks. In the region of measurement 0.021.0 GeV2 , the helicity distribution is zero within experimental uncertainties.

Note:

5 pages, 5 figures, 1 table/ text slightly expanded, 10 references added

13.88.+e
13.60.-r
14.65.-q
14.20.Dh
positron deuteron: deep inelastic scattering
polarized beam
polarized target
K: electroproduction
K+: multiplicity
K-: multiplicity

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