Quark-hadron duality in spin structure functionsg1pandg1d

P Bosted ,S Boiarinov,J W Price,S Pozdniakov,S Bültmann,C Paterson,L Dennis,H Egiyan,W K Brooks,L B Weinstein,M Garçon,E Polli,D Doughty,P Stoler,M Bellis,F Sabatié,S Barrow,N Guler,R Fatemi,V Gyurjyan,K Beard,L Zana,S Mcaleer,M F Vineyard,J Pierce,S Dytman,K Lukashin,M Bektasoglu,S A Philips,B M Preedom,J Langheinrich,B B Niczyporuk,G Ricco,N Baillie,J R Calarco,Y Ilieva,E De Sanctis,C Hadjidakis,C Tur,D Cords,M Moteabbed,A I Ostrovidov,E Wolin,P Ambrozewicz,P D Rubin,I Hleiqawi,M Kossov,K Kim,S Taylor,K Mikhailov,V S Serov,D Crabb,N A Baltzell,J M Laget,J D Kellie,P Eugenio,J Donnelly,E Pasyuk,G E Dodge,V Batourine,P L Cole,Ji Li,B E Stokes,M Huertas,G Asryan,K Hicks,M R Niroula,Y G Sharabian,K Livingston,J Napolitano,H Bagdasaryan,C Djalali,M Battaglieri,B A Raue,P Corvisiero,P V Degtyarenko,N Markov,M Nozar,H Denizli,R J Feuerbach,J Shaw,J J Manak,D Branford,R Devita,R Miskimen,L C Smith,T Mibe,M Mirazita,W Kim,F J Klein,N V Shvedunov,A Deur,G S Mutchler,J P Cummings,H Lu,M Williams,P Coltharp,C E Hyde-Wright,L H Kramer,S E Kuhn,S Strauch,D I Sober,M Taiuti,S Stepanyan,M Ungaro,J Yun,Y Prok,P Collins,M Guidal,D S Carman,J Hardie,J T Goetz,L M Qin,M D Mestayer,M Holtrop,A V Skabelin,S Bouchigny,M Amarian,E Golovatch,K S Egiyan,D Rowntree,R A Schumacher,G Rosner,M Dugger,R Suleiman,K V Dharmawardane,S Chen,E S Smith,B Carnahan,A Stavinsky,S L Careccia,I Niculescu,F X Girod,M Guillo,A Tkabladze,V Kubarovsky,F W Hersman,K Y Kim,K L Giovanetti,E L Isupov,J W C Mcnabb,R De Masi,S Niccolai,M H Wood,J Zhang,V Sapunenko,N Benmouna,L Morand,L Todor,G P Gilfoyle,H G Juengst,B E Bonner,B A Mecking,G Gavalian,H Avakian,G Niculescu,R Thompson,H S Jo,D P Weygand,O Pogorelko,M Khandaker,K Hafidi,D Lawrence,M Klusman,M Maccormick,K A Griffioen,R Minehart,T A Forest,A Cazes,A V Vlassov,V Mokeev,D Protopopescu,F Ronchetti,A Yegneswaran,C Butuceanu,O P Dzyubak,G Riccardi,M Osipenko,K Park,H Crannell,G Fedotov,C Keith,R Bradford,L Elouadrhiri,U Thoma,D G Ireland,N Pivnyuk,I Bedlinskiy,D Heddle,B Mckinnon,J Lachniet,S V Kuleshov,B Zhao,S Tkachenko,R Nasseripour,P Dragovitsch,M Ripani,P Rossi,J P Santoro,S A Morrow,R W Gothe,M M Ito,M Anghinolfi,C A Meyer,R A Niyazov,D J Tedeschi,A Klein,A Gönenç ,J Kühn ,Carlos A Salgado ,K S Joo ,G S Adams ,H O Funsten ,A Biselli ,R Hakobyan ,J Muêller ,Volker Burkert ,J Ball ,G V O’rielly ,L B Guo ,V Credé ,D Počanić ,P Nadel-Turoński ,A C S Lima ,David Jenkins ,Б С Ишханов ,Z W Zhao

doi:10.1103/physrevc.75.035203

Abstract

New measurements of the spin structure functions of the proton and deuteron g1p(x,Q2) and g1d(x,Q2) in the nucleon resonance region are compared with extrapolations of target-mass-corrected next-to-leading-order (NLO) QCD fits to higher energy data. Averaged over the entire resonance region (W<2 GeV), the data and QCD fits are in good agreement in both magnitude and Q2 dependence for Q2>1.7 GeV2. This global duality appears to result from cancellations among the prominent local resonance regions: in particular strong sigma{3/2} contributions in the Delta(1232) region appear to be compensated by strong sigma{1/2} contributions in the resonance region centered on 1.5 GeV. These results are encouraging for the extension of NLO QCD fits to lower W and Q2 than have been used previously.

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