Measurement of R=σL/σT and the separated longitudinal and transverse structure functions in the nucleon-resonance region

Y Liang,N S Chant,M Jones,V Papavassiliou,M E Christy,A Ahmidouch,S A Wood,V Ziskin,A Cochran,V Tvaskis,J Reinhold,O Rondon,R Asaturyan,R Tieulent,R Gilman,R Sawafta,D Mckee,W Boeglin,G Niculescu,M Zeier,R Ent,O K Baker,M A Miller,S Danagoulian,W Lorenzon,R D Ransome,E Segbefia,A Lung,D Gaskell,M Bouwhuis,B Zihlmann,D F Geesaman,R B Piercey,C Smith,M Harvey,A Gasparian,D Meekins,J W Martin,V Tadevosyan,D Dutta,S F Pate,J Dunne,J Arrington,H Mkrtchyan,S Stepanyan,D S Brown,A Uzzle,J Cha,X Jiang,K Garrow,H Breuer,A J Sarty,P Markowitz,I Niculescu,L Yuan,R J Holt,A Bruell,S Avery,S Strauch,P Bosted,K Mcilhany,E Kinney,H P Blok,L Tang,C Keppel ,B Mueller ,R Carlini ,E Schulte ,Feng Xiong ,C Bochna ,P Guèye ,Gao H ,W Vulcan ,Christopher Armstrong ,Leon J Cole ,D Day ,H Fenker ,D H Potterveld ,D Beck ,T G O’neill ,J Mitchell ,P.g Roos ,A M Nathan ,Lu Gan ,D Mack ,R Milner ,B D Fox ,Emmanuel Rollinde

doi:10.1103/physrevc.105.065205

Abstract

We report on a detailed study of longitudinal strength in the nucleon resonance region, presenting new results from inclusive electron-proton cross sections measured at Jefferson Lab Hall C in the four-momentum transfer range 0.2<Q2<5.5GeV2. The data have been used to accurately perform 167 Rosenbluth-type longitudinal/transverse separations. The precision R=σL/σT data are presented here, along with the first separate values of the inelastic structure functions F1 and FL in this regime. The resonance longitudinal component is found to be significant, both in magnitude and in the existence of defined mass peaks. Additionally, quark-hadron duality is here observed above Q2=1GeV2 in the separated structure functions independently.Received 15 December 2021Accepted 9 June 2022DOI:https://doi.org/10.1103/PhysRevC.105.065205©2022 American Physical SocietyPhysics Subject Headings (PhySH)Research AreasNuclear structure & decaysNuclear Physics

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