Single-spin asymmetries for pions and charged kaons are measured in semi-inclusive deep-inelastic scattering of positrons and electrons off a transversely nuclear-polarized hydrogen target. The dependence of the cross section on the azimuthal angles of the target polarization ([phi]S) and the produced hadron ([phi]) is found to have a substantial sin([phi]+[phi]S) modulation for the production of [pi]+, [pi]- and K+. This Fourier component can be interpreted in terms of non-zero transversity distribution functions and non-zero favored and disfavored Collins fragmentation functions with opposite sign. For [pi]0 and K- production the amplitude of this Fourier component is consistent with zero.
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Data di pubblicazione: | 2010 | |
Titolo: | Effects of transversity in deep-inelastic scattering by polarized protons | |
Autori: | A. Airapetian;N. Akopov;Z. Akopov;E. Aschenauer;W. Augustyniak;R. Avakian;A. Avetissian;E. Avetisyan;A. Bacchetta;S. Belostotski;N. Bianchi;H. Blok;A. Borissov;J. Bowles;I. Brodsky;V. Bryzgalov;J. Burns;M. Capiluppi;G. Capitani;E. Cisbani;G. Ciullo;M. Contalbrigo;P. Dalpiaz;W. Deconinck;R. D. Leo;L. D. Nardo;E. D. Sanctis;M. Diefenthaler;P. D. Nezza;M. Düren;M. Ehrenfried;G. Elbakian;F. Ellinghaus;U. Elschenbroich;R. Fabbri;A. Fantoni;L. Felawka;S. Frullani;D. Gabbert;G. Gapienko;V. Gapienko;F. Garibaldi;V. Gharibyan;F. Giordano;S. Gliske;M. Golembiovskaya;C. Hadjidakis;M. Hartig;D. Hasch;G. Hill;A. Hillenbrand;M. Hoek;Y. Holler;I. Hristova;Y. Imazu;A. Ivanilov;H. Jackson;H. Jo;S. Joosten;R. Kaiser;G. Karyan;T. Keri;E. Kinney;A. Kisselev;N. Kobayashi;V. Korotkov;V. Kozlov;P. Kravchenko;L. Lagamba;R. Lamb;L. Lapikás;I. Lehmann;P. Lenisa;L. Linden-Levy;A. L. Ruiz;W. Lorenzon;X. Lu;X. Lu;B. Ma;D. Mahon;N. Makins;S. Manaenkov;L. Manfré;Y. Mao;B. Marianski;A. M. de la Ossa;H. Marukyan;C. Miller;Y. Miyachi;A. Movsisyan;M. Murray;A. Mussgiller;E. Nappi;Y. Naryshkin;A. Nass;M. Negodaev;W. Nowak;L. Pappalardo;R. Perez-Benito;N. Pickert;M. Raithel;P. Reimer;A. Reolon;C. Riedl;K. Rith;G. Rosner;A. Rostomyan;J. Rubin;D. Ryckbosch;Y. Salomatin;F. Sanftl;A. Schäfer;G. Schnell;B. Seitz;T. Shibata;V. Shutov;M. Stancari;M. Statera;E. Steffens;J. Steijger;H. Stenzel;J. Stewart;F. Stinzing;S. Taroian;A. Terkulov;A. Trzcinski;M. Tytgat;P. v. der Nat;Y. V. Haarlem;C. V. Hulse;D. Veretennikov;V. Vikhrov;I. Vilardi;C. Vogel;S. Wang;S. Yaschenko;H. Ye;Z. Ye;S. Yen;W. Yu;D. Zeiler;B. Zihlmann;P. Zupranski | |
Rivista: | PHYSICS LETTERS. SECTION B | |
Parole Chiave: | Semi-inclusive DIS; Single-spin asymmetries; Polarized structure functions; Transversity; Collins function | |
Abstract: | Single-spin asymmetries for pions and charged kaons are measured in semi-inclusive deep-inelastic scattering of positrons and electrons off a transversely nuclear-polarized hydrogen target. The dependence of the cross section on the azimuthal angles of the target polarization ([phi]S) and the produced hadron ([phi]) is found to have a substantial sin([phi]+[phi]S) modulation for the production of [pi]+, [pi]- and K+. This Fourier component can be interpreted in terms of non-zero transversity distribution functions and non-zero favored and disfavored Collins fragmentation functions with opposite sign. For [pi]0 and K- production the amplitude of this Fourier component is consistent with zero. | |
Digital Object Identifier (DOI): | 10.1016/j.physletb.2010.08.012 | |
Handle: | http://hdl.handle.net/11392/1412314 | |
Appare nelle tipologie: | 03.1 Articolo su rivista |