Spin asymmetry A1d and the spin-dependent structure function g1d of the deuteron at low values of x and Q2

V. Yu Alexakhin, Yu Alexandrov, G. D. Alexeev, A. Amoroso, B. Badełek, F. Balestra, J. Ball, G. Baum, Y. Bedfer, C. Bernet, R. Bertini, R. Birsa, J. Bisplinghoff, P. Bordalo, F. Bradamante, A. Bravar, A. Bressan, G. Brona, E. Burtin, M. P. BussaA. Chapiro, A. Cicuttin, M. Colantoni, S. Costa, M. L. Crespo, N. d'Hose, S. Dalla Torre, S. S. Dasgupta, R. De Masi, O. Yu Denisov, L. Dhara, V. Diaz Kavka, A. M. Dinkelbach, S. V. Donskov, V. A. Dorofeev, N. Doshita, V. Duic, W. Dünnweber, P. D. Eversheim, W. Eyrich, M. Fabro, M. Faessler, V. Falaleev, A. Ferrero, L. Ferrero, M. Finger, M. Finger, H. Fischer, J. Franz, J. M. Friedrich, V. Frolov, R. Garfagnini, F. Gautheron, O. P. Gavrichtchouk, S. Gerassimov, R. Geyer, M. Giorgi, B. Gobbo, S. Goertz, A. M. Gorin, O. A. Grajek, A. Grasso, B. Grube, J. Hannappel, D. von Harrach, T. Hasegawa, J. Heckmann, S. Hedicke, F. H. Heinsius, R. Hermann, C. Heß, F. Hinterberger, M. von Hodenberg, N. Horikawa, S. Horikawa, C. Ilgner, A. I. Ioukaev, S. Ishimoto, O. Ivanov, T. Iwata, R. Jahn, A. Janata, R. Joosten, N. I. Jouravlev, E. Kabuß, D. Kang, B. Ketzer, G. V. Khaustov, Yu A. Khokhlov, N. V. Khomutov, Yu Kisselev, F. Klein, S. Koblitz, J. H. Koivuniemi, V. N. Kolosov, E. V. Komissarov, K. Kondo, K. Königsmann, I. Konorov, V. F. Konstantinov, A. S. Korentchenko, A. Korzenev, A. M. Kotzinian, N. A. Koutchinski, N. P. Kravchuk, Z. V. Kroumchtein, R. Kuhn, F. Kunne, K. Kurek, M. E. Ladygin, M. Lamanna, J. M. Le Goff, J. Lichtenstadt, T. Liska, I. Ludwig, A. Maggiora, M. Maggiora, A. Magnon, G. K. Mallot, C. Marchand, J. Marroncle, A. Martin, J. Marzec, T. Matsuda, A. N. Maximov, W. Meyer, A. Mielech, Yu V. Mikhailov, M. A. Moinester, O. Nähle, J. Nassalski, S. Neliba, D. P. Neyret, V. I. Nikolaenko, A. A. Nozdrin, V. F. Obraztsov, A. G. Olshevsky, M. Ostrick, A. Padee, P. Pagano, S. Panebianco, D. Panzieri, S. Paul, D. V. Peshekhonov, V. D. Peshekhonov, G. Piragino, S. Platchkov, J. Pochodzalla, V. A. Polyakov, A. A. Popov, J. Pretz, S. Procureur, C. Quintans, S. Ramos, G. Reicherz, A. M. Rozhdestvensky, E. Rondio, A. B. Sadovski, V. D. Samoylenko, A. Sandacz, M. G. Sapozhnikov, I. A. Savin, P. Schiavon, C. Schill, L. Schmitt, O. Yu Shevchenko, A. A. Shishkin, H. W. Siebert, L. Sinha, A. N. Sissakian, M. Slunecka, G. I. Smirnov, F. Sozzi, V. P. Sugonyaev, A. Srnka, F. Stinzing, M. Stolarski, M. Sulc, R. Sulej, N. Takabayashi, V. V. Tchalishev, F. Tessarotto, A. Teufel, L. G. Tkatchev, M. Virius, N. V. Vlassov, R. Webb, E. Weise, Q. Weitzel, R. Windmolders, S. Wirth, W. Wiślicki, K. Zaremba, J. Zhao, R. Ziegler, A. Zvyagin

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Abstract

We present a precise measurement of the deuteron longitudinal spin asymmetry A1d and of the deuteron spin-dependent structure function g1d at Q2 < 1   (GeV / c)2 and 4 × 10-5 < x < 2.5 × 10-2 based on the data collected by the COMPASS experiment at CERN during the years 2002 and 2003. The statistical precision is tenfold better than that of the previous measurement in this region. The measured A1d and g1d are found to be consistent with zero in the whole range of x.

Original languageEnglish
Pages (from-to)330-340
Number of pages11
JournalPhysics Letters B
Volume647
Issue number5-6
DOIs
StatePublished - 19 Apr 2007

Keywords

  • A
  • Inelastic muon scattering
  • Low Q
  • Low x
  • Spin
  • Structure function
  • g

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