The exclusive electroproduction of [rho]0 mesons was studied with the hermes spectrometer at the Desy laboratory by scattering 27.6 GeV positron and electron beams off a transversely polarized hydrogen target. Spin density matrix elements for this process were determined from the measured production- and decay-angle distributions of the produced [rho]0 mesons. These matrix elements embody information on helicity transfer and the validity of s-channel helicity conservation in the case of a transversely polarized target. From the spin density matrix elements, the leading-twist term in the single-spin asymmetry was calculated separately for longitudinally and transversely polarized [rho]0 mesons. Neglecting s-channel helicity changing matrix elements, results for the former can be compared to calculations based on generalized parton distributions, which are sensitive to the contribution of the total angular momentum of the quarks to the proton spin.

Exclusive [rho]0 electroproduction on transversely polarized protons

CAPILUPPI, Marco;CIULLO, Giuseppe;CONTALBRIGO, Marco;FERRETTI, Paola;GIORDANO, Francesca;LENISA, Paolo;PAPPALARDO, Luciano Libero;STANCARI, Michelle Dawn;STATERA, Marco;
2009

Abstract

The exclusive electroproduction of [rho]0 mesons was studied with the hermes spectrometer at the Desy laboratory by scattering 27.6 GeV positron and electron beams off a transversely polarized hydrogen target. Spin density matrix elements for this process were determined from the measured production- and decay-angle distributions of the produced [rho]0 mesons. These matrix elements embody information on helicity transfer and the validity of s-channel helicity conservation in the case of a transversely polarized target. From the spin density matrix elements, the leading-twist term in the single-spin asymmetry was calculated separately for longitudinally and transversely polarized [rho]0 mesons. Neglecting s-channel helicity changing matrix elements, results for the former can be compared to calculations based on generalized parton distributions, which are sensitive to the contribution of the total angular momentum of the quarks to the proton spin.
A., Airapetian; N., Akopov; Z., Akopov; E., Aschenauer; W., Augustyniak; A., Avetissian; E., Avetisyan; B., Ball; N., Bianchi; H., Blok; H., Böttcher; C., Bonomo; A., Borissov; V., Bryzgalov; J., Burns; Capiluppi, Marco; G., Capitani; E., Cisbani; Ciullo, Giuseppe; Contalbrigo, Marco; Ferretti, Paola; W., Deconinck; R. D., Leo; L. D., Nardo; E. D., Sanctis; M., Diefenthaler; P. D., Nezza; J., Dreschler; M., Düren; M., Ehrenfried; G., Elbakian; F., Ellinghaus; R., Fabbri; A., Fantoni; L., Fellawka; S., Frullani; D., Gabbert; G., Gapienko; V., Gapienko; V., Gharibyan; Giordano, Francesca; S., Gliske; 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; T., Keri; E., Kinney; A., Kisselev; N., Kobayashi; V., Korotkov; P., Kravchenko; L., Lagamba; R., Lamb; L., Lapikás; I., Lehmann; Lenisa, Paolo; 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; V., Muccifora; M., Murray; A., Mussgiller; E., Nappi; Y., Naryshkin; A., Nass; W., Nowak; Pappalardo, Luciano Libero; R., Perez Benito; P., Reimer; A., Reolon; C., Riedl; K., Rith; G., Rosner; A., Rostomyan; J., Rubin; D., Ryckbosch; Y., Salomatin; F., Sanftl; A., Schäfer; G., Schnell; K., Schüler; B., Seitz; T., Shibata; V., Shutov; Stancari, Michelle Dawn; Statera, Marco; E., Steffens; J., Steijger; H., Stenzel; J., Stewart; F., Stinzing; S., Taroian; A., Terkulov; A., Trzcinski; M., Tytgat; A., Vandenbroucke; P. v., der Nat; Y. V., Haarlem; C. V., Hulse; M., Varanda; 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
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11392/1377778
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