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Moments of the Spin Structure Functions $g_1^p$ and $g_1^d$ for 0.05 $< Q^2 < 3.0 GeV^2$

Y. Prok P. Bosted V. D. Burkert A. Deur K. V. Dharmawardane G. E. Dodge K. A. Griffioen S. E. Kuhn R. Minehart G. Adams M.J. Amaryan M. Anghinolfi G. Asryan G. Audit 1 H. Avakian H. Bagdasaryan N. Baillie J.P. Ball N.A. Baltzell S. Barrow M. Battaglieri K. Beard I. Bedlinskiy M. Bektasoglu M. Bellis N. Benmouna B.L. Berman A.S. Biselli L. Blaszczyk S. Boiarinov B.E. Bonner S. Bouchigny 2, 3 R. Bradford D. Branford W.J. Briscoe W.K. Brooks S. B¨ultmann C. Butuceanu J.R. Calarco S.L. Careccia D.S. Carman L. Casey A. Cazes S. Chen L. Cheng P.L. Cole P. Collins P. Coltharp D. Cords P. Corvisiero D. Crabb V. Crede J.P. Cummings D. Dale N. Dashyan R. de Masi 1 R. de Vita E. de Sanctis P.V. Degtyarenko H. Denizli L. Dennis K.S. Dhuga R. Dickson C. Djalali D. Doughty M. Dugger S. Dytman O.P. Dzyubak H. Egiyan K.S. Egiyan L. El Fassi L. Elouadrhiri P. Eugenio R. Fatemi G. Fedotov G. Feldman R.G. Fersh R.J. Feuerbach T.A. Forest A. Fradi 2 H. Funsten M. Garçon 1 G. Gavalian N. Gevorgyan G.P. Gilfoyle K.L. Giovanetti F.X. Girod 1 J.T. Goetz E. Golovatch R.W. Gothe M. Guidal 2 M. Guillo N. Guler L. Guo V. Gyurjyan C. Hadjidakis 2 K. Hafidi H. Hakobyan C. Hanretty J. Hardie N. Hassall D. Heddle F.W. Hersman K. Hicks I. Hleiqawi M. Holtrop M. Huertas C.E. Hyde-Wright Y. Ilieva D.G. Ireland B.S. Ishkhanov E.L. Isupov M.M. Ito D. Jenkins H.S. Jo 2 J.R. Johnstone K. Joo H.G. Juengst N. Kalantarians C.D. Keith J.D. Kellie M. Khandaker K.Y. Kim K. Kim W. Kim A. Klein F.J. Klein M. Klusman M. Kossov Z. Krahn L.H. Kramer V. Kubarovsky J. Kuhn S.V. Kuleshov J. Lachniet J.M. Laget 1, 3 J. Langheinrich D. Lawrence Ji Li A.C.S. Lima K. Livingston H.Y. Lu K. Lukashin M. Maccormick 2 C. Marchand 1 N. Markov P. Mattione S. Mcaleer B. Mckinnon J.W.C. Mcnabb B.A. Mecking M.D. Mestayer C.A. Meyer T. Mibe K. Mikhailov M. Mirazita R. Miskimen V. Mokeev L. Morand 1 B. Moreno 2 K. Moriya S.A. Morrow 1, 2 M. Moteabbed J. Mueller E. Munevar G.S. Mutchler P. Nadel-Turonski R. Nasseripour S. Niccolai 2 G. Niculescu I. Niculescu B.B. Niczyporuk M.R. Niroula R.A. Niyazov M. Nozar G.V. O'Rielly M. Osipenko A.I. Ostrovidov K. Park E. Pasyuk C. Paterson S. Anefalos Pereira S.A. Philips J. Pierce N. Pivnyuk D. Pocanic O. Pogorelko I. Popa S. Pozdniakov B.M. Preedom J.W. Price S. Procureur 1 D. Protopopescu L.M. Qin B.A. Raue G. Riccardi G. Ricco M. Ripani B.G. Ritchie G. Rosner P. Rossi D. Rowntree P.D. Rubin F. Sabatié 1 J. Salamanca C. Salgado J.P. Santoro V. Sapunenko R.A. Schumacher M.L. Seely V.S. Serov Y.G. Sharabian D. Sharov J. Shaw N.V. Shvedunov A.V. Skabelin E.S. Smith L.C. Smith D.I. Sober D. Sokhan A. Stavinsky S.S. Stepanyan S. Stepanyan B.E. Stokes P. Stoler I.I. Strakovsky S. Strauch R. Suleiman M. Taiuti D.J. Tedeschi A. Tkabladze S. Tkachenko L. Todor M. Ungaro M.F. Vineyard A.V. Vlassov D.P. Watts L.B. Weinstein D.P. Weygand M. Williams E. Wolin M.H. Wood A. Yegneswaran J. Yun L. Zana J. Zhang B. Zhao Z.W. Zhao
Abstract : The spin structure functions $g_1$ for the proton and the deuteron have been measured over a wide kinematic range in x and $Q^2$ using 1.6 and 5.7 GeV longitudinally polarized electrons incident upon polarized $NH_3$ and $ND_3$ targets at Jefferson Lab. Scattered electrons were detected in the CEBAF Large Acceptance Spectrometer, for 0.05 $< Q^2 < 5 GeV^2$ and W < 3 GeV. The first moments of $g_1$ for the proton and deuteron are presented -- both have a negative slope at low $Q^2$, as predicted by the extended Gerasimov-Drell-Hearn sum rule. The first result for the generalized forward spin polarizability of the proton $\gamma_0^p$ is also reported, and shows evidence of scaling above $Q^2 = 1.5 GeV^2$. Although the first moments of $g_1$ are consistent with Chiral Perturbation Theory (ChPT) calculations up to approximately $Q^2 = 0.06 GeV^2$, a significant discrepancy is observed between the $\gamma_0^p$ data and ChPT for$\ gamma_0^p$, even at the lowest $Q^2$.
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Submitted on : Tuesday, February 19, 2008 - 4:44:02 PM
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Y. Prok, P. Bosted, V. D. Burkert, A. Deur, K. V. Dharmawardane, et al.. Moments of the Spin Structure Functions $g_1^p$ and $g_1^d$ for 0.05 $< Q^2 < 3.0 GeV^2$. Physics Letters B, Elsevier, 2009, 672, pp.12-16. ⟨10.1016/j.physletb.2008.12.063⟩. ⟨in2p3-00257582⟩

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