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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

Physics Letters B, Feb 9, 2009, Vol.672(1), p.12(5) [Periódico revisado por pares]

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  • Título:
    Moments of the spin structure functions g 1 p and g 1 d for 0.05 < Q 2 < 3.0 GeV 2
  • É parte de: Physics Letters B, Feb 9, 2009, Vol.672(1), p.12(5)
  • Descrição: To link to full-text access for this article, visit this link: http://dx.doi.org/10.1016/j.physletb.2008.12.063 Byline: Y. Prok (h), P. Bosted (ai), V.D. Burkert (ai), A. Deur (ai), K.V. Dharmawardane (ac), G.E. Dodge (ac), K.A. Griffioen (am), S.E. Kuhn (ac), R. Minehart (al), G. Adams (ae), M.J. Amaryan (ac), M. Anghinolfi (r), G. Asryan (an), G. Audit (g), H. Avakian (q)(ai), H. Bagdasaryan (an)(ac), N. Baillie (am), J.P. Ball (b), N.A. Baltzell (ah), S. Barrow (m), M. Battaglieri (r), K. Beard (u), I. Bedlinskiy (t), M. Bektasoglu (ac), M. Bellis (e), N. Benmouna (n), B.L. Berman (n), A.S. Biselli (ae)(k), L. Blaszczyk (m), S. Boiarinov (t)(ai), B.E. Bonner (af), S. Bouchigny (ai)(s), R. Bradford (e), D. Branford (j), W.J. Briscoe (n), W.K. Brooks (ai), S. Bultmann (ac), C. Butuceanu (am), J.R. Calarco (z), S.L. Careccia (ac), D.S. Carman (ai), L. Casey (f), A. Cazes (ah), S. Chen (m), L. Cheng (f), P.L. Cole (ai)(p), P. Collins (b), P. Coltharp (m), D. Cords (ai), P. Corvisiero (r), D. Crabb (al), V. Crede (m), J.P. Cummings (ae), D. Dale (p), N. Dashyan (an), R. De Masi (g), R. De Vita (r), E. De Sanctis (q), P.V. Degtyarenko (ai), H. Denizli (ad), L. Dennis (m), K.S. Dhuga (n), R. Dickson (e), C. Djalali (ah), D. Doughty (h)(ai), M. Dugger (b), S. Dytman (ad), O.P. Dzyubak (ah), H. Egiyan (am)(ai), K.S. Egiyan (an), L. El Fassi (a), L. Elouadrhiri (h)(ai), P. Eugenio (m), R. Fatemi (al), G. Fedotov (y), G. Feldman (n), R.G. Fersh (am), R.J. Feuerbach (am), T.A. Forest (ac)(p), A. Fradi (s), H. Funsten (am), M. Garcon (g), G. Gavalian (z)(ac), N. Gevorgyan (an), G.P. Gilfoyle (ag), K.L. Giovanetti (u), F.X. Girod (g), J.T. Goetz (c), E. Golovatch (r), R.W. Gothe (ah), M. Guidal (s), M. Guillo (ah), N. Guler (ac), L. Guo (ai), V. Gyurjyan (ai), C. Hadjidakis (s), K. Hafidi (a), H. Hakobyan (an), C. Hanretty (m), J. Hardie (h)(ai), N. Hassall (o), D. Heddle (ai), F.W. Hersman (z), K. Hicks (ab), I. Hleiqawi (ab), M. Holtrop (z), M. Huertas (ah), C.E. Hyde-Wright (ac), Y. Ilieva (n), D.G. Ireland (o), B.S. Ishkhanov (y), E.L. Isupov (y), M.M. Ito (ai), D. Jenkins (ak), H.S. Jo (s), J.R. Johnstone (o), K. Joo (ai)(i), H.G. Juengst (ac), N. Kalantarians (ac), C.D. Keith (ai), J.D. Kellie (o), M. Khandaker (aa), K.Y. Kim (ad), K. Kim (v), W. Kim (v), A. Klein (ac), F.J. Klein (l)(f), M. Klusman (ae), M. Kossov (t), Z. Krahn (e), L.H. Kramer (l)(ai), V. Kubarovsky (ae)(ai), J. Kuhn (ae)(e), S.V. Kuleshov (t), V. Kuznetsov (v), J. Lachniet (e)(ac), J.M. Laget (g)(ai), J. Langheinrich (ah), D. Lawrence (x), Ji Li (ae), A.C.S. Lima (n), K. Livingston (o), H.Y. Lu (ah), K. Lukashin (f), M. MacCormick (s), C. Marchand (g), N. Markov (i), P. Mattione (af), S. McAleer (m), B. McKinnon (o), J.W.C. McNabb (e), B.A. Mecking (ai), M.D. Mestayer (ai), C.A. Meyer (e), T. Mibe (ab), K. Mikhailov (t), M. Mirazita (q), R. Miskimen (x), V. Mokeev (y)(ai), L. Morand (g), B. Moreno (s), K. Moriya (e), S.A. Morrow (s)(g), M. Moteabbed (l), J. Mueller (ad), E. Munevar (n), G.S. Mutchler (af), P. Nadel-Turonski (n), R. Nasseripour (l)(ah), S. Niccolai (n)(s), G. Niculescu (ab)(u), I. Niculescu (n)(u), B.B. Niczyporuk (ai), M.R. Niroula (ac), R.A. Niyazov (ac)(ai), M. Nozar (ai), G.V. O'Rielly (n), M. Osipenko (r)(y), A.I. Ostrovidov (m), K. Park (v), E. Pasyuk (b), C. Paterson (o), S. Anefalos Pereira (q), S.A. Philips (n), J. Pierce (al), N. Pivnyuk (t), D. Pocanic (al), O. Pogorelko (t), I. Popa (n), S. Pozdniakov (t), B.M. Preedom (ah), J.W. Price (d), S. Procureur (g), D. Protopopescu (z)(o), L.M. Qin (ac), B.A. Raue (l)(ai), G. Riccardi (m), G. Ricco (r), M. Ripani (r), B.G. Ritchie (b), G. Rosner (o), P. Rossi (q), D. Rowntree (w), P.D. Rubin (ag), F. Sabatie (ac)(g), J. Salamanca (p), C. Salgado (aa), J.P. Santoro (ak)(f)(ai), V. Sapunenko (r)(ai), R.A. Schumacher (e), M.L. Seely (ai), V.S. Serov (t), Y.G. Sharabian (ai), D. Sharov (y), J. Shaw (x), N.V. Shvedunov (y), A.V. Skabelin (w), E.S. Smith (ai), L.C. Smith (al), D.I. Sober (f), D. Sokhan (j), A. Stavinsky (t), S.S. Stepanyan (v), S. Stepanyan (ai)(h)(an), B.E. Stokes (m), P. Stoler (ae), I.I. Strakovsky (n), S. Strauch (ah), R. Suleiman (w), M. Taiuti (r), D.J. Tedeschi (ah), A. Tkabladze (n), S. Tkachenko (ac), L. Todor (e), M. Ungaro (ae)(i), M.F. Vineyard (aj)(ag), A.V. Vlassov (t), D.P. Watts (j), L.B. Weinstein (ac), D.P. Weygand (ai), M. Williams (e), E. Wolin (ai), M.H. Wood (ah), A. Yegneswaran (ai), J. Yun (ac), L. Zana (z), J. Zhang (ac), B. Zhao (i), Z.W. Zhao (ah) Keywords: Spin structure functions; Nucleon structure; Chiral Perturbation Theory Abstract: The spin structure functions g.sub.1 for the proton and the deuteron have been measured over a wide kinematic range in x and Q.sup.2 using 1.6 and 5.7 GeV longitudinally polarized electrons incident upon polarized NH.sub.3 and ND.sub.3 targets at Jefferson Lab. Scattered electrons were detected in the CEBAF Large Acceptance Spectrometer, for 0.05<Q.sup.2<5 GeV.sup.2 and W<3 GeV. The first moments of g.sub.1 for the proton and deuteron are presented - both have a negative slope at low Q.sup.2, as predicted by the extended Gerasimov-Drell-Hearn sum rule. The first extraction of the generalized forward spin polarizability of the proton [gamma].sub.0.sup.p is also reported. This quantity shows strong Q.sup.2 dependence at low Q.sup.2. Our analysis of the Q.sup.2 evolution of the first moment of g.sub.1 shows agreement in leading order with Heavy Baryon Chiral Perturbation Theory. However, a significant discrepancy is observed between the [gamma].sub.0.sup.p data and Chiral Perturbation calculations for [gamma].sub.0.sup.p, even at the lowest Q.sup.2. Author Affiliation: (a) Argonne National Laboratory, USA (b) Arizona State University, Tempe, AZ 85287-1504, USA (c) University of California at Los Angeles, Los Angeles, CA 90095-1547, USA (d) California State University, Dominguez Hills, Carson, CA 90747, USA (e) Carnegie Mellon University, Pittsburgh, PA 15213, USA (f) Catholic University of America, Washington, DC 20064, USA (g) CEA-Saclay, Service de Physique Nucleaire, 91191 Gif-sur-Yvette, France (h) Christopher Newport University, Newport News, VI 23606, USA (i) University of Connecticut, Storrs, CT 06269, USA (j) Edinburgh University, Edinburgh EH9 3JZ, United Kingdom (k) Fairfield University, Fairfield, CT 06824, USA (l) Florida International University, Miami, FL 33199, USA (m) Florida State University, Tallahassee, FL 32306, USA (n) The George Washington University, Washington, DC 20052, USA (o) University of Glasgow, Glasgow G12 8QQ, United Kingdom (p) Idaho State University, Pocatello, ID 83209, USA (q) INFN, Laboratori Nazionali di Frascati, 00044 Frascati, Italy (r) INFN, Sezione di Genova, 16146 Genova, Italy (s) Institut de Physique Nucleaire ORSAY, Orsay, France (t) Institute of Theoretical and Experimental Physics, Moscow, 117259, Russia (u) James Madison University, Harrisonburg, VI 22807, USA (v) Kyungpook National University, Daegu 702-701, South Korea (w) Massachusetts Institute of Technology, Cambridge, MA 02139-4307, USA (x) University of Massachusetts, Amherst, MA 01003, USA (y) Moscow State University, General Nuclear Physics Institute, 119899 Moscow, Russia (z) University of New Hampshire, Durham, NH 03824-3568, USA (aa) Norfolk State University, Norfolk, VI 23504, USA (ab) Ohio University, Athens, OH 45701, USA (ac) Old Dominion University, Norfolk, VI 23529, USA (ad) University of Pittsburgh, Pittsburgh, PA 15260, USA (ae) Rensselaer Polytechnic Institute, Troy, NY 12180-3590, USA (af) Rice University, Houston, TX 77005-1892, USA (ag) University of Richmond, Richmond, VI 23173, USA (ah) University of South Carolina, Columbia, SC 29208, USA (ai) Thomas Jefferson National Accelerator Facility, Newport News, VI 23606, USA (aj) Union College, Schenectady, NY 12308, USA (ak) Virginia Polytechnic Institute and State University, Blacksburg, VI 24061-0435, USA (al) University of Virginia, Charlottesville, VI 22901, USA (am) College of William and Mary, Williamsburg, VI 23187-8795, USA (an) Yerevan Physics Institute, 375036 Yerevan, Armenia Article History: Received 7 July 2008; Revised 22 December 2008; Accepted 30 December 2008 Article Note: (miscellaneous) Editor: D.F. Geesaman
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