Polarised quark distributions in the nucleon from semi-inclusive spin asymmetries

B Adeva , T. Akdogan , E. Arik , A. Arvidson , B. Badelek , G. Bardin , G. Baum , P. Berglund , L. Betev , R. Birsa , N.de Botton , F. Bradamante , A. Bravar , A. Bressan , S. Bültmann , E. Burtin , D. Crabb , J. Cranshaw , T. Çuhadar , S. Dalla Torre , R.van Dantzig , B. Derro , A. Deshpande , S. Dhawan , C. Dulya , S. Eichblatt , D. Fasching , F. Feinstein , C. Fernandez , S. Forthmann , B. Frois , A. Gallas , J.A. Garzon , H. Gilly , M. Giorgi , E.von Goeler , S. Goertz , G. Gracia , N.de Groot , M.Grosse Perdekamp , K. Haft , D.von Harrach , T. Hasegawa , P. Hautle , N. Hayashi , C.A. Heusch , N. Horikawa , V.W. Hughes , G. Igo , S. Ishimoto , T. Iwata , E.M. Kabuß , T. Kageya , A. Karev , H.J. Kessler , T.J. Ketel , J. Kiryluk , Yu. Kisselev , D. Krämer , V. Krivokhijine , W. Kröger , V. Kukhtin , K Kurek , J. Kyynäräinen , M. Lamanna , U. Landgraf , J.M. Le Goff , F. Lehar , A.de Lesquen , J. Lichtenstadt , M. Litmaath , A. Magnon , G.K. Mallot , F. Marie , A. Martin , J. Martino , T. Matsuda , B. Mayes , J.S. McCarthy , K. Medved , W. Meyer , G.van Middelkoop , D. Miller , Y. Miyachi , K. Mori , J. Moromisato , J. Nassalski , L. Naumann , T.O. Niinikoski , J.E.J. Oberski , A. Ogawa , C. Ozben , H. Pereira , F. Perrot-Kunne , D. Peshekhonov , L. Pinsky , S. Platchkov , M. Plo , D. Pose , H. Postma , J. Pretz , R. Puntaferro , G. Rädel , A. Rijllart , G. Reicherz , J. Roberts , M. A Callejo-Rodriguez , E Rondio , B. Roscherr , I. Sabo , J. Saborido , A. Sandacz , I. Savin , P. Schiavon , A. Schiller , E.P. Sichtermann , F. Simeoni , G.I. Smirnov , A. Staude , A. Steinmetz , U. Stiegler , H. Stuhrmann , Michał Szleper , F Tessarotto , D. Thers , W. Tlaczala , A. Tripet , G. Unel , M. Velasco , J. Vogt , R. Voss , C. Whitten , R Windmolders , R. Willumeit , W Wiślicki , A. Witzmann , J. Ylöstalo , A.M. Zanetti , Krzysztof Zaremba , J Zhao

Abstract

We present a measurement of semi-inclusive spin asymmetries for positively and negatively charged hadrons from deep inelastic scattering of polarised muons on polarised protons and deuterons in the range 0.003\<x\<0.7 and Q2\>1 GeV2. Compared to our previous publication on this subject, with the new data the statistical errors have been reduced by nearly a factor of two. From these asymmetries and our inclusive spin asymmetries we determine the polarised quark distributions of valence quarks and non-strange sea quarks at Q2=10 GeV2. The polarised u valence quark distribution, Δuv(x), is positive and the polarisation increases with x. The polarised d valence quark distribution, Δdv(x), is negative and the non-strange sea distribution, Δq̄(x), is consistent with zero over the measured range of x. We find for the first moments ∫01Δuv(x)dx=0.77±0.10±0.08, ∫01Δdv(x)dx=−0.52±0.14±0.09 and ∫01Δq̄(x)dx=0.01±0.04±0.03, where we assumed Δū(x)=Δd̄(x). We also determine for the first time the second moments of the valence distributions ∫01xΔqv(x)dx.
Author B Adeva
B Adeva,,
-
, T. Akdogan
T. Akdogan,,
-
, E. Arik
E. Arik,,
-
, A. Arvidson
A. Arvidson,,
-
, B. Badelek
B. Badelek,,
-
, G. Bardin
G. Bardin,,
-
, G. Baum
G. Baum,,
-
, P. Berglund
P. Berglund,,
-
, L. Betev
L. Betev,,
-
, R. Birsa
R. Birsa,,
-
et al.`
Journal seriesPhysics Letters B, ISSN 0370-2693
Issue year1998
Vol420
No1–2
Pages180-190
DOIDOI:10.1016/S0370-2693(97)01546-3
URL http://www.sciencedirect.com/science/article/pii/S0370269397015463
Languageen angielski
Score (nominal)40
Publication indicators WoS Impact Factor: 2006 = 5.043 (2) - 2007=3.656 (5)
Citation count*332 (2018-07-01)
Cite
Share Share

Get link to the record
msginfo.png


* presented citation count is obtained through Internet information analysis and it is close to the number calculated by the Publish or Perish system.
Back