6533b870fe1ef96bd12d043e
RESEARCH PRODUCT
Gluon polarization in the nucleon from quasi-real photoproduction of high-pT hadron pairs
R. SulejS. NelibaP. BerglundB. GrubeM.g. SapozhnikovH. SchmittA. MaggioraE. RondioM. VarandaA. ZvyaginW. KastaunColin BernetA. SrnkaI. KonorovI. KonorovM.p. BussaA. KorzenevE.s. AgeevF. H. HeinsiusF. H. HeinsiusS. GerassimovS. GerassimovJ. M. Le GoffT. ToedaMarc WagnerP.d. EversheimA. MielechA. MielechS. IshimotoFrank KleinK. KondoK. ZarembaM. WiesmannJ. ReymannA.a. ShishkinV. DuicSergey DonskovO.p. GavrichtchoukS. PlatchkovP. RebourgeardY. BedferN. DedekL. SinhaF. BalestraS. PaulR. ZieglerV.n. KolosovV.a. PolyakovN.p. KravchukA.k. KonoplyannikovJ. ZhaoR. JahnA. GorinV. DiazM. MaggioraR. IjaduolaN. TakabayashiR. De MasiP. BordaloJ. BisplinghoffMassimo LamannaMassimo LamannaYu. KisselevA. AmorosoVladimir PeshekhonovR. BirsaE.v. KomissarovAndres CicuttinJ. LichtenstadtNorihiro DoshitaG. PiraginoN. D'hoseYu.a. KhokhlovA. MaximovG. ReicherzJosef PochodzallaI. LudwigNaoaki HorikawaM. OstrickAram KotzinianAram KotzinianR. WindmoldersA.a. NozdrinJ. NassalskiM. GiorgiR. BertiniAndrea FerreroOleg V. IvanovR. JoostenS. Dalla TorreA. N. SissakianJ.m. FriedrichV.d. SamoylenkoYu. AlexandrovP. FaulandChristian SchillC. MarchandM.e. LadyginV.f. ObraztsovM. FingerE. WeiseL. FerreroD. KangM.l. ColantoniK. KönigsmannS. HedickeA. ColavitaS. HorikawaS. HorikawaR. C. WebbA.m. DinkelbachK. PlatzerV.n. BytchkovA.v. DolgopolovS. ProcureurK. KowalikA.b. SadovskiL. CeriniV.i. TretyakJ. PretzJ. PretzA. GrünemaierG.v. KrivokhizhinO.a. GrajekN.a. KoutchinskiM. Von HodenbergA. SandaczF. KarstensU. WiednerS. S. DasguptaG.v. KhaustovL. SchmittA. GrassoM. StolarskiJ. FranzL. G. TkatchevF. StinzingGrzegorz BronaMiroslav SulcD. ThersAnna ZanettiA. JanataFranco BradamanteGerhard K. MallotJ. EhlersJ. EhlersF. KunneV.v. TchalishevN.i. JouravlevS. CostaE. BurtinV.f. KonstantinovW. MeyerMaria Liz CrespoA.i. IoukaevF. SozziR. HermannE. M. KabußPaolo PaganoV.p. SugonyaevQ. WeitzelA.a. PopovS. RamosJ.h. KoivuniemiK. RithK. RithF. HinterbergerP. SchiavonS. PanebiancoH. FischerK. MedvedAlan D. MartinZ.v. KroumchteinW. EyrichT. HasegawaA. ChapiroMurray MoinesterT. SchmidtD. NeyretM. A. FaesslerAlessandro BressanD. Von HarrachC. IlgnerYu.v. MikhailovS. TrousovJ. MarzecR. GeyerA.g. OlshevskySt. GoertzO.yu. DenisovC. HeßA. MagnonL. DharaM. SluneckaTakahiro IwataE. SallerS. KoblitzM. SansB. GobboB. BadelekJ. MarroncleA. TeufelMiroslav ViriusK. KurekA. PadeeB. KetzerD. PeshekhonovW. WiślickiH. D. PereiraN.v. VlassovS. WirthC. QuintansJ. HannappelGünter BaumO.yu. ShevchenkoI.a. SavinA. BravarV.i. NikolaenkoR. GarfagniniH.-w. SiebertI. ManuilovV. FalaleevD. PanzieriT. LiškaM. FabroM. LeberigM. LeberigA.m. RozhdestvenskyN. V. KhomutovJ. BallG.i. SmirnovFabrice GautheronT. MatsudaV. FrolovV.yu. AlexakhinW. DünnweberG. D. AlexeevV.a. DorofeevA.s. KorentchenkoF. TessarottoR. KuhnO. NähleV. KalinnikovA. Skachkovasubject
Quantum chromodynamicsPhysicsNuclear and High Energy PhysicsParticle physicsMuon010308 nuclear & particles physicsHadronDeep inelastic scattering01 natural sciencesHelicityGluonNuclear physics0103 physical sciencesCOMPASS experimentHigh Energy Physics::ExperimentNuclear Experiment010306 general physicsNucleondescription
Abstract We present a determination of the gluon polarization Δ G / G in the nucleon, based on the helicity asymmetry of quasi-real photoproduction events, Q 2 1 ( GeV / c ) 2 , with a pair of large transverse-momentum hadrons in the final state. The data were obtained by the COMPASS experiment at CERN using a 160 GeV polarized muon beam scattered on a polarized 6 LiD target. The helicity asymmetry for the selected events is 〈 A ∥ / D 〉 = 0.002 ± 0.019 ( stat ) ± 0.003 ( syst ) . From this value, we obtain in a leading-order QCD analysis Δ G / G = 0.024 ± 0.089 ( stat ) ± 0.057 ( syst ) at x g = 0.095 and μ 2 ≃ 3 ( GeV / c ) 2 .
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2006-02-01 | Physics Letters B |