Spin asymmetries for events with highpThadrons in DIS and an evaluation of the gluon polarization

6533b7d8fe1ef96bd126b5d9

RESEARCH PRODUCT

Spin asymmetries for events with highpThadrons in DIS and an evaluation of the gluon polarization

A. Staude T. O. Niinikoski S. Platchkov Y. Miyachi C. S. ÖZben C. S. ÖZben A. Karev W. Meyer Etienne Burtin G. Igo Rudiger Voss T. J. Ketel J. A. Garzon J. A. Garzon Franco Bradamante M. Plo J. E.j. Oberski Gerhard K. Mallot Gerhard K. Mallot W. Tlaczala W. Tlaczala A. Magnon P. Schiavon Matias Rodriguez Matias Rodriguez D. Peshekhonov D. Peshekhonov David Miller E. P. Sichtermann E. P. Sichtermann E. P. Sichtermann T. Hasegawa T. Hasegawa T. Matsuda T. Matsuda J. Kiryluk J. Kiryluk M. Litmaath M. Litmaath F. Simeoni G.i. Smirnov A. Bravar A. Bravar J. Martino J. Lichtenstadt R. Sulej R. Sulej Jay Roberts B. Derro Jinkui Zhao M. Grosse Perdekamp M. Grosse Perdekamp J. Nassalski G. Unel H. Gilly S. Bültmann S. Bültmann D. Pose Massimo Lamanna Massimo Lamanna Yu. Kisselev V. W. Hughes E. Rondio J. H. Moromisato Takahiro Iwata H. J. Kessler E. Arik G. Reicherz Naoaki Horikawa Ulrich Landgraf A. Arvidson A. Arvidson H. Pereira K. Kowalik K. Kurek D. Von Harrach Andrea Bressan A. Gallas J. M. Le Goff T. ÇUhadar T. ÇUhadar Patrick Hautle Patrick Hautle S. Ishimoto A. De Lesquen St. Goertz S. Dalla Torre Heinrich B. Stuhrmann G. Rädel C. Dulya C. Dulya Mayda Velasco Anna Zanetti J. Vogt R. Van Dantzig L. Klostermann Ricardo Piegaia Ricardo Piegaia E. M. Kabuß D. Thers M. Giorgi A. Witzmann A. Witzmann D. Fasching D. Fasching F. Lehar C. A. Whitten B. Badelek B. Badelek J. Kyynäräinen J. Kyynäräinen A. Tripet Günter Baum C. Fernandez C. Fernandez J. Cranshaw J. Cranshaw Kunikazu Mori B. Frois N. Hayashi P. Berglund K. Medved R. Windmolders R. Windmolders U. Stiegler S. Eichblatt S. Eichblatt E. Von Goeler A. Ogawa A. Ogawa Bernardo Adeva I. Sabo A. M. Kotzinian J. S. Mccarthy K. Haft F. Tessarotto W. Kröger W. Kröger Abhay Deshpande Abhay Deshpande F. Feinstein S. K. Dhawan Clemens A. Heusch Clemens A. Heusch R. Birsa J. Pretz J. Pretz I.a. Savin G. Gracia Lawrence Pinsky A. Sandacz N. De Botton B. W. Mayes K. Zaremba K. Zaremba H. Postma J. Saborido N. De Groot N. De Groot Regine Willumeit Alan D. Martin F. Marie F. Kunne D. G. Crabb A. Steinmetz L. Betev L. Betev W. Wiślicki

subject

Physics Nuclear and High Energy Physics Particle physics Meson production 010308 nuclear & particles physics media_common.quotation_subject Hadron Deep inelastic scattering Polarization (waves)01 natural sciences Asymmetry Gluon Nuclear physics 0103 physical sciences Transverse momentum High Energy Physics::Experiment Astrophysics::Earth and Planetary Astrophysics Nuclear Experiment 010306 general physics Nucleon media_common

description

We present a measurement of the longitudinal spin cross section asymmetry for deep-inelastic muon-nucleon interactions with two high transverse momentum hadrons in the final state. Two methods of event classification are used to increase the contribution of the photon-gluon fusion process to above 30%. The most effective one, based on a neural network approach, provides the asymmetries A(p)lN(-->)lhhX=0.030+/-0.057(stat)+/-0.010(syst) and A(d)lN(-->)lhhX=0.070+/-0.076(stat)+/-0.010(syst). From these values we derive an averaged gluon polarization DeltaG/G=-0.20+/-0.28(stat)+/-0.10(syst) at an average fraction of nucleon momentum carried by gluons =0.07.

year	journal	country	edition	language
2004-07-23	Physical Review D

https://doi.org/10.1103/physrevd.70.012002