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Statements

Subject Item
n2:RIV%2F46747885%3A24220%2F12%3A%230002487%21RIV14-MSM-24220___
rdf:type
skos:Concept n8:Vysledek
dcterms:description
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 mu(+) beam and a transversely polarised NH3 target. The Sivers asymmetry of the proton has been extracted in the Bjorken x range 0.003 < x < 0.7. The new measurements have small statistical and systematic uncertainties of a few percent and confirm with considerably better accuracy the previous COMPASS measurement. The Sivers asymmetry is found to be compatible with zero for negative hadrons and positive for positive hadrons, a clear indication of a spin-orbit coupling of quarks in a transversely polarised proton. As compared to measurements at lower energy, a smaller Sivers asymmetry for positive hadrons is found in the region x > 0.03. 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. 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 mu(+) beam and a transversely polarised NH3 target. The Sivers asymmetry of the proton has been extracted in the Bjorken x range 0.003 < x < 0.7. The new measurements have small statistical and systematic uncertainties of a few percent and confirm with considerably better accuracy the previous COMPASS measurement. The Sivers asymmetry is found to be compatible with zero for negative hadrons and positive for positive hadrons, a clear indication of a spin-orbit coupling of quarks in a transversely polarised proton. As compared to measurements at lower energy, a smaller Sivers asymmetry for positive hadrons is found in the region x > 0.03. 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.
dcterms:title
II - Experimental investigation of transverse spin asymmetries in mu-p SIDIS processes: Sivers asymmetries II - Experimental investigation of transverse spin asymmetries in mu-p SIDIS processes: Sivers asymmetries
skos:prefLabel
II - Experimental investigation of transverse spin asymmetries in mu-p SIDIS processes: Sivers asymmetries II - Experimental investigation of transverse spin asymmetries in mu-p SIDIS processes: Sivers asymmetries
skos:notation
RIV/46747885:24220/12:#0002487!RIV14-MSM-24220___
n8:predkladatel
n9:orjk%3A24220
n3:aktivita
n18:S n18:P n18:I
n3:aktivity
I, P(7E12066), P(LA08015), S
n3:cisloPeriodika
4-5
n3:dodaniDat
n10:2014
n3:domaciTvurceVysledku
n15:8586977
n3:druhVysledku
n19:J
n3:duvernostUdaju
n13:S
n3:entitaPredkladatele
n7:predkladatel
n3:idSjednocenehoVysledku
140441
n3:idVysledku
RIV/46747885:24220/12:#0002487
n3:jazykVysledku
n20:eng
n3:klicovaSlova
deep-inelastic scattering; Collins; distributions
n3:klicoveSlovo
n6:deep-inelastic%20scattering n6:distributions n6:Collins
n3:kodStatuVydavatele
NL - Nizozemsko
n3:kontrolniKodProRIV
[640F1BE8DEDF]
n3:nazevZdroje
Physics Letters. B
n3:obor
n17:BG
n3:pocetDomacichTvurcuVysledku
1
n3:pocetTvurcuVysledku
220
n3:projekt
n5:7E12066 n5:LA08015
n3:rokUplatneniVysledku
n10:2012
n3:svazekPeriodika
717
n3:tvurceVysledku
Polák, Jaroslav Steiger, Lukáš
n3:wos
000310863300012
s:issn
0370-2693
s:numberOfPages
7
n16:doi
10.1016/j.physletb.2012.09.056
n14:organizacniJednotka
24220