Measurements of the separated longitudinal structure function FL 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, 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. BreuerG. 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, Y. Liang, G. Lolos, A. Lung, D. Mack, S. Malace, P. Markowitz, G. Mbianda, E. McGrath, D. McKee, D. G. Meekins, H. Mkrtchyan, 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, G. Warren, F. Wesselmann, B. Wojtsekhowski, S. A. Wood, C. Yan, B. Zihlmann

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Abstract

Structure functions, as measured in lepton-nucleon scattering, have proven to be very useful in studying the partonic 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 in particular for the longitudinal structure function. Here, we present separated structure functions for hydrogen and deuterium at low four-momentum transfer squared, Q2<1GeV2, and compare them with parton distribution parametrization and kT factorization approaches. While differences are found, the parametrizations generally agree with the data, even at the very low-Q2 scale of the data. The deuterium data show a smaller longitudinal structure function and a smaller ratio of longitudinal to transverse cross section, R, than the proton. This suggests either an unexpected difference in R for the proton and the neutron or a suppression of the gluonic distribution in nuclei.

Original languageEnglish (US)
Article number045204
JournalPhysical Review C
Volume97
Issue number4
DOIs
StatePublished - Apr 26 2018

Bibliographical note

Funding Information:
This work was supported in part by the US Department of Energy under Grant No. DE-AC02-06CH11357 and the National Science Foundation under Grants No. PHY-0245045, No. PHY-0555510, No. PHY-0653440, and No. PHY-1002644.

Funding Information:
The authors thank A. Stasto for providing curves and guidance for utilization of the model in Ref. [12] . This work was supported by the US Department of Energy (DOE) under Grant No. DE-AC05-06OR23177, under which Jefferson Science Associates, LLC, operates Jefferson Lab. This work was supported in part by the US Department of Energy under Grant No. DE-AC02-06CH11357 and the National Science Foundation under Grants No. PHY-0245045, No. PHY-0555510, No. PHY-0653440, and No. PHY-1002644.

Publisher Copyright:
© 2018 American Physical Society.

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