POLARIZATION OF VALENCE AND NON-STRANGE SEA QUARKS IN THE NUCLEON FROM SEMIINCLUSIVE SPIN ASYMMETRIES

Authors
ADEVA B ARIK E ARVIDSON A BADELEK B BALLINTIJN MK BARDIN G BAUM G BERGLUND P BETEV L BIRD IG BIRSA R BJORKHOLM P BONNER BE DEBOTTON N BRADAMANTE F BRESSAN A BULTMANN S BURTIN E CAVATA C CRABB D CRANSHAW J CUHADAR T DALLATORRE S VANDANTZIG R DESHPANDE A DHAWAN S DULYA C DYRING A EICHBLATT S FAIVRE JC FASCHING D FEINSTEIN F FERNANDEZ C FROIS B GARZON JA GAUSSIRAN T GIORGI M VONGOELER E GOMEZ A GRACIA G DEGROOT N PERDEKAMP MG GULMEZ E VONHARRACH D HASEGAWA T HAUTLE P HAYASHI N HEUSCH CA HORIKAWA N HUGHES VW IGO G ISHIMOTO S IWATA T KABUSS EM KAGEYA T KAREV A KESSLER HJ KETEL TJ KISHI A KISSELEV Y KLOSTERMANN L KRAMER D KRIVOKHIJINE V KROGER W KYYNARAINEN J LAMANNA M LANDGRAF U LAYDA T LEGOFF JM LEHAR F DELESQUEN A LICHTENSTADT J LITMAATH M LOPEZPONTE S LOWE M MAGNON A MALLOT GK MARIE F MARTIN A MARTINO J MATSUDA T MAYES B MCCARTHY JS MEDVED K VANMIDDELKOOP G MILLER D MORI K MOROMISATO J NAGAITSEV A NASSALSKI J NAUMANN L NIINIKOSKI TO OBERSKI JEJ OGAWA A OZBEN C PENZO A PEREZ C PERROTKUNNE F PESHEKHONOV D PIEGAIA R PINSKY L PLATCHKOV S PLO M POSE D POSTMA H PRETZ J PUSSIEUX T PYRLIK J REYHANCAN I RIJLLART A ROBERTS JB ROCK S RODRIGUEZ M RONDIO E ROSADO A SABO I SABORIDO J SANDACZ A SAVIN I SCHIAVON P SCHULER KP SEGAL R SEITZ R SEMERTZIDIS Y SERGEEV S SEVER F SHANAHAN P SICHTERMANN EP SMIRNOV GI STAUDE A STEINMETZ A STIEGLER U STUHRMANN H SZLEPER M TEICHERT KM TESSAROTTO F VELASCO M VOGT J VOSS R WEINSTEIN R WHITTEN C WINDMOLDERS R WILLUMEIT R WISLICKI W WITZMANN A ZANETTI AM ZHAO J
Citation
B. Adeva et al., POLARIZATION OF VALENCE AND NON-STRANGE SEA QUARKS IN THE NUCLEON FROM SEMIINCLUSIVE SPIN ASYMMETRIES, Physics letters. Section B, 369(1), 1996, pp. 93-100
Citations number
20
Categorie Soggetti
Physics
Journal title
Physics letters. Section B → ACNP
ISSN journal
03702693
Volume
369
Issue
1
Year of publication
1996
Pages
93 - 100
Database
ISI
SICI code
0370-2693(1996)369:1<93:POVANS>2.0.ZU;2-F
Abstract
We present a measurement of semi-inclusive spin asymmetries for positi vely and negatively charged hadrons from deep inelastic scattering of polarised muons on polarised protons and deuterons in the range 0.003 < x < 0.7. From these asymmetries and the previously published inclusi ve spin asymmetries we determine, for the first time, the x-dependent spin distributions for up and down valence quarks and for non-strange sea quarks. We find that the first moments of the valence quark spin d istributions are Delta u(v) = 1.01 +/- 0.19 +/- 0.14 and Delta d(v) = -0.57 +/- 0.22 +/- 0.11. The spin distribution function of non-strange sea quarks is consistent with zero over the measured range of x and t he first moment is Delta (u) over bar = Delta (d) over bar = -0.02 +/- 0.09 +/- 0.03.