Effects of transversity in deep-inelastic scattering by polarized protons

Airapetian, A.; Akopov, N.; Akopov, Z.; Aschenauer, E.; Augustyniak, W.; Avakian, R.; Avetissian, A.; Avetisyan, E.; Bacchetta, A.; Belostotski, S.; Bianchi, N.; Blok, H.; Borissov, A.; Bowles, J.; Brodsky, I.; Bryzgalov, V.; Burns, J.; Capiluppi, Marco; Capitani, G.; Cisbani, E.; Ciullo, Giuseppe; Contalbrigo, Marco; Ferretti, Paola; Deconinck, W.; Leo, R. D.; Nardo, L. D.; Sanctis, E. D.; Diefenthaler, M.; Nezza, P. D.; Düren, M.; Ehrenfried, M.; Elbakian, G.; Ellinghaus, F.; Elschenbroich, U.; Fabbri, R.; Fantoni, A.; Felawka, L.; Frullani, S.; Gabbert, D.; Gapienko, G.; Gapienko, V.; Garibaldi, F.; Gharibyan, V.; Giordano, Francesca; Gliske, S.; Golembiovskaya, M.; Hadjidakis, C.; Hartig, M.; Hasch, D.; Hill, G.; Hillenbrand, A.; Hoek, M.; Holler, Y.; Hristova, I.; Imazu, Y.; Ivanilov, A.; Jackson, H.; Jo, H.; Joosten, S.; Kaiser, R.; Karyan, G.; Keri, T.; Kinney, E.; Kisselev, A.; Kobayashi, N.; Korotkov, V.; Kozlov, V.; Kravchenko, P.; Lagamba, L.; Lamb, R.; Lapikás, L.; Lehmann, I.; Lenisa, Paolo; Linden Levy, L.; Ruiz, A. L.; Lorenzon, W.; Lu, X.; Lu, X.; Ma, B.; Mahon, D.; Makins, N.; Manaenkov, S.; Manfré, L.; Mao, Y.; Marianski, B.; de la Ossa, A. M.; Marukyan, H.; Miller, C.; Miyachi, Y.; Movsisyan, A.; Murray, M.; Mussgiller, A.; Nappi, E.; Naryshkin, Y.; Nass, A.; Negodaev, M.; Nowak, W.; Pappalardo, Luciano Libero; Perez Benito, R.; Pickert, N.; Raithel, M.; Reimer, P.; Reolon, A.; Riedl, C.; Rith, K.; Rosner, G.; Rostomyan, A.; Rubin, J.; Ryckbosch, D.; Salomatin, Y.; Sanftl, F.; Schäfer, A.; Schnell, G.; Seitz, B.; Shibata, T.; Shutov, V.; Stancari, Michelle Dawn; Statera, Marco; Steffens, E.; Steijger, J.; Stenzel, H.; Stewart, J.; Stinzing, F.; Taroian, S.; Terkulov, A.; Trzcinski, A.; Tytgat, M.; der Nat, P. v.; Haarlem, Y. V.; Hulse, C. V.; Veretennikov, D.; Vikhrov, V.; Vilardi, I.; Vogel, C.; Wang, S.; Yaschenko, S.; Ye, H.; Ye, Z.; Yen, S.; Yu, W.; Zeiler, D.; Zihlmann, B.; Zupranski, P.

doi:10.1016/j.physletb.2010.08.012

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

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