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Measurements of the Separated Longitudinal Structure Function F_L from Hydrogen and Deuterium Targets at Low Q²

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arxiv 1606.02614 v1 pith:U6BZKY4R submitted 2016-06-08 nucl-ex hep-ex

Measurements of the Separated Longitudinal Structure Function F_L from Hydrogen and Deuterium Targets at Low Q²

V. Tvaskis , A. Tvaskis , I. Niculescu , D. Abbott , G.S. Adams , A. Afanasev , A. Ahmidouch , T. Angelescu
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J. Arrington R. Asaturyan S. Avery O.K. Baker N. Benmouna B.L. Berman A. Biselli H.P. Blok W.U. Boeglin P.E. Bosted E. Brash H. Breuer G. Chang N. Chant M.E. Christy S.H. Connell M.M. Dalton S. Danagoulian D. Day T. Dodario J.A. Dunne D. Dutta N. El Khayari R. Ent H.C. Fenker V.V. Frolov D. Gaskell K. Garrow R. Gilman P. Gueye K. Hafidi W. Hinton R.J. Holt T. Horn G. M. Huber H. Jackson X. Jiang M.K. Jones K. Joo J.J. Kelly C.E. Keppel J.Kuhn E. Kinney A. Klein V. Kubarovsky M. Liang Y. Liang G. Lolos A. Lung D. Mack S. Malace P. Markowitz G. Mbianda E. McGrath D. Mckee P. McKee D.G. Meekins H. Mkrtchyan B. Moziak J. Napolitano T. Navasardyan G. Niculescu M. Nozar T. Ostapenko Z. Papandreou D. Potterveld P.E. Reimer J. Reinhold J. Roche S.E. Rock E. Schulte E. Segbefia C. Smith G.R. Smith P. Stoler V. Tadevosyan L. Tang J. Telfeyan L. Todor M. Ungaro A. Uzzle S. Vidakovic A. Villano W.F. Vulcan M. Wang G. Warren F. Wesselmann B. Wojtsekhowski S.A. Wood C. Xu C. Yan L. Yuan X. Zheng B. Zihlmann H. Zhu
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classification nucl-ex hep-ex
keywords structurelongitudinaldatadeuteriumfunctionfunctionsdistributionhydrogen
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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Structure functions, as measured in lepton-nucleon scattering, have proven to be very useful in studying the quark dynamics within the nucleon. However, it is experimentally difficult to separately determine the longitudinal and transverse structure functions, and consequently there are substantially less data available for the longitudinal structure function in particular. Here we present separated structure functions for hydrogen and deuterium at low four--momentum transfer squared, Q^2< 1 GeV^2, and compare these with parton distribution parameterizations and a k_T factorization approach. While differences are found, the parameterizations generally agree with the data even at the very low Q^2 scale of the data. The deuterium data show a smaller longitudinal structure function, and smaller ratio of longitudinal to transverse cross section R, than the proton. This suggests either an unexpected difference in R for the proton and neutron or a suppression of the gluonic distribution in nuclei.

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