Measurement of R=σL/σT and the Separated Longitudinal and Transverse Structure Functions in the Nucleon-Resonance Region

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

Physical review C（2022）

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摘要

We report on a detailed study of longitudinal strength in the nucleonresonance region, presenting new results from inclusive electron-proton crosssections measured at Jefferson Lab Hall C in the four-momentum transfer range0.2 < Q^2 < 5.5 GeV^2. The data have been used to accurately perform 167Rosenbluth-type longitudinal / transverse separations. The precision R =sigma_L / sigma_T data are presented here, along with the first separate valuesof the inelastic structure functions F_1 and F_L in this regime. The resonancelongitudinal component is found to be significant, both in magnitude and in theexistence of defined mass peaks. Additionally, quark-hadron duality is hereobserved above Q^2 = 1 GeV^2 in the separated structure functionsindependently.

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