6533b832fe1ef96bd129a1fa
RESEARCH PRODUCT
The spin-dependent structure function of the proton g1p and a test of the Bjorken sum rule
P. SchiavonI. KonorovI. KonorovC. HessMiroslav SulcM. ZiembickiF. HinterbergerF.h. HeinsiusAchim RichterA. MagnonF. MassmannS. RamosNorihiro DoshitaNorihiro DoshitaN. D'hoseAlan D. MartinD. KangK. KönigsmannSoumen PaulT. HasegawaE. RondioA. AustregesiloA. AustregesiloR. GazdaA. MaggioraE. PerevalovaR. KuhnA. N. SissakianS. DasA.g. OlshevskyR. JahnA. FerreroA. FerreroA. MaximovC. QuintansD. CoticM.p. BussaV.d. SamoylenkoO.p. GavrichtchoukVladimir A. PolyakovD. NeyretElena RoccoJ. PolakW. KaferJ.h. KoivuniemiR. JoostenL. SinhaS. NeubertA. KorzenevT. MatsudaK. ZarembaLaura SilvaA.a. LednevA. MutterA. MutterA. LehmannJ. BallJ. M. Le GoffS. PlatchkovO. KouznetsovYu.v. MikhailovA. KrálR. WindmoldersS. SarkarR. BertiniFranco BradamanteB. Pawlukiewicz-kaminskaS.s. DasguptaM. V. ZavertyaevC. MarchandV. RapatskyA. NagaytsevF. BalestraA. SrnkaL. LauserS. GrabmüllerW. WislickiJ. PochodzallaV. DuicG. SbrizzaiA. PadeeF. TessarottoMoinesterP. JasinskiO.yu. DenisovV. DiazT. NegriniJ. MarzecG. PiraginoS. UhlP.d. EversheimG.b. PontecorvoK. KlimaszewskiM. MaggioraP. BordaloF. NerlingA. AmorosoM. ChiossoF. HaasR. GeyerJean-francois RajotteTakahiro IwataD.i. RyabchikovD. Von HarrachM. GiorgiA.s. NunesS. KoblitzAndres CicuttinL. SchmittT. NagelD. PanzieriJ. PretzT. SchlüterA. El AlaouiS. GerassimovS. GerassimovM. KrämerN. HorikawaJ. ZhaoK. KondoK. KondoM.g. AlekseevSergey DonskovT. LiškaG. ReicherzH.-w. SiebertF. KunneR. GushterskiW. EyrichM. ViriusS. TessaroV.f. KonstantinovJohannes BernhardA. GuskovY. BedferG.v. KhaustovA. ZvyaginT. MichigamiS. Dalla TorreE. BurtinH. SantosQ. WeitzelM. BettinelliM. SluneckaA. SandaczB. GobboI.a. SavinAndrea BressanW. SchröderN. I. ZhuravlevCh. HöppnerYu.a. KhokhlovA. M. KotzinianW. MeyerMaria Liz CrespoH. FischerM. L. ColantoniC. IlgnerC. IlgnerJ. BarthR. KonopkaA. TeufelS. SchopfererN.v. VlassovGünter BaumM.g. SapozhnikovO.yu. ShevchenkoS. LevoratoYu. KisselevD. ChabernyS.-u. ChungV.n. KolosovV.i. NikolaenkoD.v. PeshekhonovJ. MarroncleA.v. EfremovR. GarfagniniZ.v. KroumchteinFrançois HerrmannA. BravarA. MannM. OstrickG. JegouK. KurekE. KabussOleg V. IvanovR. HermannH. WollnyS. SosioChristian SchillI. UmanG. PesaroS. TakekawaYu. AlexandrovJ. LichtenstadtM. StolarskiI. GnesiBakur ParsamyanG.i. SmirnovFabrice GautheronM. A. FaesslerR. PankninV.yu. AlexakhinA. GrassoR. SulejM. FingerC. FrancoR. BirsaG. D. AlexeevW. DünnweberJ.m. FriedrichJ. BisplinghoffE. ZemlyanichkinaL. DharaB. BadelekB. KetzerF. RobinetA. FilinGrzegorz BronaGrzegorz BronaGerhard K. MallotA. VossenF. SozziJ. NassalskiS. IshimotoFrank KleinK. KowalikYu. IvanshinL. G. TkatchevS. GoertzS. GoertzB. Grubesubject
Quantum chromodynamicsPhysicsCoupling constantNuclear and High Energy PhysicsParticle physicsMuonIsovectorProton010308 nuclear & particles physicsDeep inelastic scattering01 natural sciencesNuclear physics0103 physical sciencesSum rule in quantum mechanics010306 general physicsSpin-½description
Abstract The inclusive double-spin asymmetry, A 1 p , has been measured at COMPASS in deep-inelastic polarised muon scattering off a large polarised NH3 target. The data, collected in the year 2007, cover the range Q 2 > 1 ( GeV / c ) 2 , 0.004 x 0.7 and improve the statistical precision of g 1 p ( x ) by a factor of two in the region x 0.02 . The new proton asymmetries are combined with those previously published for the deuteron to extract the non-singlet spin-dependent structure function g 1 NS ( x , Q 2 ) . The isovector quark density, Δ q 3 ( x , Q 2 ) , is evaluated from a NLO QCD fit of g 1 NS . The first moment of Δ q 3 is in good agreement with the value predicted by the Bjorken sum rule and corresponds to a ratio of the axial and vector coupling constants | g A / g V | = 1.28 ± 0.07 ( stat . ) ± 0.10 ( syst. ) .
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2010-07-01 | Physics Letters B |