The spin-dependent structure function g1(x) of the proton from polarized deep-inelastic muon scattering

6533b858fe1ef96bd12b64ae

RESEARCH PRODUCT

The spin-dependent structure function g1(x) of the proton from polarized deep-inelastic muon scattering

Michal Szleper D. Crabb Heinrich B. Stuhrmann A. Schiller Naoaki Horikawa J. Pretz A. Rijllart Bernardo Adeva T. Kageya J. Ylöstalo A. Ogawa A. Ogawa L. Naumann C. Dulya C. Dulya I. Sabo C. A. Whitten J. Kyynäräinen J. Kyynäräinen A. Tripet D. Peshekhonov F. Lehar V. W. Hughes G. Gracia P. Schiavon A. Sandacz M. Giorgi V. G. Krivokhijine B. Mayes B. Mayes Rudiger Voss Yu. Kisselev S. K. Dhawan B. Derro J. S. Mccarthy S. Bültmann T. O. Niinikoski Ulrich Landgraf Ulrich Landgraf E. Arik Alan D. Martin F. Marie A. Staude M. Litmaath M. Litmaath Etienne Burtin David Miller Matias Rodriguez Matias Rodriguez Kunikazu Mori J. Moromisato J. Moromisato A. Magnon D. Thers E. P. Sichtermann K. Kurek E. M. Kabuß E. Rondio D. Pose Abhay Deshpande K. Zaremba I.a. Savin T. J. Ketel M. Plo F. Feinstein A. Karev Matthias Grosse Perdekamp G. Bardin A. Witzmann A. Witzmann Patrick Hautle Patrick Hautle J. M. Le Goff G. Igo J. Kiryluk Clemens A. Heusch Clemens A. Heusch T. ÇUhadar S. Platchkov J. Lichtenstadt R. Birsa J. A. Garzon J. A. Garzon Franco Bradamante W. Wislicki A. Steinmetz A. Steinmetz P. Berglund K. Medved N. De Groot N. De Groot Anna Zanetti H. Postma B. Frois J. Saborido W. Tlaczala B. Roscherr Lawrence Pinsky T. Matsuda T. Matsuda S. Ishimoto U. Stiegler H. Gilly G. Unel F. Simeoni G.i. Smirnov R. Van Dantzig R. Puntaferro J. E.j. Oberski J. Nassalski G. Van Middelkoop G. Rädel W. Meyer B. Badelek C. Fernandez C. Fernandez Mayda Velasco Mayda Velasco N. Hayashi L. Betev F. Perrot-kunne S. Eichblatt S. Eichblatt A. Bravar V. Kuktin J. Cranshaw D. Fasching D. Fasching J. Vogt G. Baum Takahiro Iwata G. Reicherz Roland Windmolders S. Dalla Torre A. Arvidson H. Pereira A. De Lesquen St. Goertz N. De Botton Andrea Bressan J. Martino A. Gallas G. K. Mallot Y. Miyachi M. Lamanna S. Forthmann K. Haft F. Tessarotto W. Kröger W. Kröger

subject

Physics Quantum chromodynamics DIS Nuclear and High Energy Physics Particle physics Muon Proton SMC Scattering g1 structure function SMC; DIS; g1 structure function Perturbative QCD Deep inelastic scattering Nuclear physics Sum rule in quantum mechanics Nucleon Particle Physics - Experiment

description

We present a new measurement of the virtual photon proton asymmetry $A_1^{\rm p}$ from deep inelastic scattering of polarized muons on polarized protons in the kinematic range $0.0008 1$ GeV$^{2}$. A perturbative QCD evolution in next-to-leading order is used to determine $g_1^{\rm p}(x)$ at a constant $Q^2$. At $Q^{2} = 10$ GeV$^{2}$ we find, in the measured range, $\int_{0.003}^{0.7} g_{1}^{\rm p}(x){\rm d}x = 0.139 \pm 0.006~({\rm stat})\pm 0.008~({\rm syst)} \pm 0.006~({\rm evol})$. The value of the first moment $\Gamma_{1}^{\rm p} = \int_{0}^{1} g_{1}^{\rm p}(x){\rm d}x$ of $g_{1}^{\rm p}$ depends on the approach used to describe the behaviour of $g_{1}^{\rm p}$ at low $x$. We find that the Ellis-Jaffe sum rule is violated. With our published result for $\Gamma_{1}^{\rm d}$ we confirm the Bjorken sum rule with an accuracy of $\approx 15\%$ at the one standard deviation level.

year	journal	country	edition	language
1997-10-30	Physics Letters B

https://doi.org/10.1016/s0370-2693(97)01106-4