II – Experimental investigation of transverse spin asymmetries in μ -p SIDIS processes: Sivers asymmetries - INSPIRE

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II – Experimental investigation of transverse spin asymmetries in μ -p SIDIS processes: Sivers asymmetries

COMPASS

Collaboration

•

C. Adolph
(
- Erlangen - Nuremberg U.
)

May, 2012

7 pages

Published in:

Phys.Lett.B 717 (2012) 383-389

Published: Oct 31, 2012

e-Print:

1205.5122 [hep-ex]

DOI:

10.1016/j.physletb.2012.09.056

Report number:

CERN-PH-EP-2012-147

Experiments:

CERN-SPS-NA58

View in:

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Abstract: (Elsevier)

The COMPASS Collaboration at CERN has measured the transverse spin azimuthal asymmetry of charged hadrons produced in semi-inclusive deep inelastic scattering using a 160 GeV μ+ beam and a transversely polarised NH 3 target. The Sivers asymmetry of the proton has been extracted in the Bjorken x range 0.0030.03 . The asymmetry is different from zero and positive also in the low x region, where sea-quarks dominate. The kinematic dependence of the asymmetry has also been investigated and results are given for various intervals of hadron and virtual photon fractional energy. In contrast to the case of the Collins asymmetry, the results on the Sivers asymmetry suggest a strong dependence on the four-momentum transfer to the nucleon, in agreement with the most recent calculations.

Note:

11 pages, 6 figures

spin: transverse
spin: asymmetry
muon+ p: deep inelastic scattering
deep inelastic scattering: semi-inclusive reaction
Sivers function
p: asymmetry
angular distribution: asymmetry
quark
momentum dependence: transverse momentum
COMPASS

References(35)

Figures(0)

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