/ nucl-ex arXiv:1606.02614


Measurements of the Separated Longitudinal Structure Function F_L from Hydrogen and Deuterium Targets at Low Q^2


Tvaskis, V. (Hampton U.) ; Tvaskis, A. ; Niculescu, I. (James Madison U.) ; Abbott, D. (Jefferson Lab) ; Adams, G.S. (Rensselaer Poly.) ; Afanasev, A. (George Washington U.) ; Ahmidouch, A. (Tohoku U.) ; Angelescu, T. (Bucharest U.) ; Arrington, J. (Argonne) ; Asaturyan, R. (Tohoku U.) ; Avery, S. (Hampton U.) ; Baker, O.K. (Jefferson Lab) ; Benmouna, N. (Montgomery Coll.) ; Berman, B.L. (George Washington U.) ; Biselli, A. (Fairfield U.) ; Blok, H.P. (Vrije U., Amsterdam) ; Boeglin, W.U. (Tohoku U.) ; Bosted, P.E. (MIT) ; Brash, E. (Tohoku U.) ; Breuer, H. (Freiburg U.) ; Chang, G. (Maryland U.) ; Chant, N. (Maryland U.) ; Christy, M.E. (Hampton U.) ; Connell, S.H. (Johannesburg U.) ; Dalton, M.M. (Virginia U.) ; Danagoulian, S. (Orsay, LAL) ; Day, D. (Wisconsin U., Milwaukee) ; Dodario, T. (Houston U.) ; Dunne, J.A. (Mississippi State U.) ; Dutta, D. (Indian Inst. Tech., Guwahati) ; Khayari, N. El (Houston U.) ; Ent, R. (Jefferson Lab) ; Fenker, H.C. (Fermilab) ; Frolov, V.V. (LIGO Livingston Obs.) ; Gaskell, D. (Jefferson Lab) ; Garrow, K. (TRIUMF) ; Gilman, R. (Jefferson Lab) ; Gueye, P. (Hampton U.) ; Hafidi, K. (Argonne) ; Hinton, W. (Hampton U.) ; Holt, R.J. (Argonne, PHY) ; Horn, T. (Jefferson Lab) ; Huber, G.M. (Regina U.) ; Jackson, H. (Argonne) ; Jiang, X. (Mianyang, Laser Fusion Res. Cent.) ; Jones, M.K. (Jefferson Lab) ; Joo, K. (Toronto U.) ; Kelly, J.J. (Maryland U.) ; Keppel, C.E. (Jefferson Lab) ; Kuhn, J. (KIT, Karlsruhe) ; Kinney, E. (Colorado U.) ; Klein, A. (Old Dominion U.) ; Kubarovsky, V. (Jefferson Lab) ; Liang, M. (Jefferson Lab) ; Liang, Y. (Giessen U.) ; Lolos, G. (Regina U.) ; Lung, A. (American U.) ; Mack, D. (Jefferson Lab) ; Malace, S. (South Carolina U.) ; Markowitz, P. (Tohoku U.) ; Mbianda, G. (Witwatersrand U.) ; McGrath, E. (James Madison U.) ; Mckee, D. (Kansas State U.) ; McKee, P. (Virginia U.) ; Meekins, D.G. (Jefferson Lab) ; Mkrtchyan, H. (Yerevan Phys. Inst.) ; Moziak, B. (Rensselaer Poly.) ; Napolitano, J. (Temple U.) ; Navasardyan, T. (Yerevan Phys. Inst.) ; Niculescu, G. (Ohio U.) ; Nozar, M. (Jefferson Lab) ; Ostapenko, T. (Gettysburg Coll.) ; Papandreou, Z. (Regina U.) ; Potterveld, D. (Massachusetts U., Amherst) ; Reimer, P.E. (Argonne) ; Reinhold, J. (Florida State U.) ; Roche, J. (Ohio U.) ; Rock, S.E. (Stanford U., Phys. Dept.) ; Schulte, E. (Rutgers U., Piscataway) ; Segbefia, E. (Hampton U.) ; Smith, C. (Cerro-Tololo InterAmerican Obs.) ; Smith, G.R. (Dubna, JINR) ; Stoler, P. (Rensselaer Poly.) ; Tadevosyan, V. (Tohoku U.) ; Tang, L. (Tohoku U.) ; Telfeyan, J. ; Todor, L. (Carnegie Mellon U.) ; Ungaro, M. (Rensselaer Poly.) ; Uzzle, A. (Hampton U.) ; Vidakovic, S. (Regina U.) ; Villano, A. (Minnesota U.) ; Vulcan, W.F. (Jefferson Lab) ; Wang, M. (Birmingham U.) ; Warren, G. (Mission Res., Newington) ; Wesselmann, F. (Tohoku U.) ; Wojtsekhowski, B. (Jefferson Lab) ; Wood, S.A. (Australian Natl. U., Canberra) ; Xu, C. (Huazhong Normal U.) ; Yan, C. (Jefferson Lab) ; Yuan, L. (Kobe U.) ; Zheng, X. (Argonne) ; Zihlmann, B. (DESY) ; Zhu, H. (Bergen U.)

Pages: 11

Abstract: 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.

Web-Page: http://inspirehep.net/record/1468166/files/desy_fl_vs_q2.png; http://inspirehep.net/record/1468166/files/fl_diff_vs_q2_wcut.png; http://inspirehep.net/record/1468166/files/r_diff_vs_q2_wcut.png; http://inspirehep.net/record/1468166/files/fl_kinematics.png; http://inspirehep.net/record/1468166/files/f2_vs_w2_3panel.png; http://inspirehep.net/record/1468166/files/avg_fl_vs_q2_1panel_take1.png; http://inspirehep.net/record/1468166/files/fl_vs_x.png; http://inspirehep.net/record/1468166/files/arXiv:1606.02614.pdf


Note: 11 pages, 7 figures, 2 data tables

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