Double-spin asymmetries in the cross section of electroproduction of $\rho^0$ and $\phi$ mesons on the proton and deuteron are measured at the HERMES experiment. The photoabsorption asymmetry in exclusive $\rho^0$ electroproduction on the proton exhibits a positive tendency. This is consistent with theoretical predictions that the exchange of an object with unnatural parity contributes to exclusive $\rho^0$ electroproduction by transverse photons. The photoabsorption asymmetry on the deuteron is found to be consistent with zero. Double-spin asymmetries in $\rho^0$ and $\phi $ meson electroproduction by quasi-real photons were also found to be consistent with zero; the asymmetry in the case of the $\phi$ meson is compatible with a theoretical prediction which involves $s\bar{s}$ knockout from the nucleon.

Double-spin asymmetries in the cross section of rho(0) and phi production at intermediate energies

CIULLO, Giuseppe;CONTALBRIGO, Marco;FERRETTI, Paola;FABBRI, Riccardo;LENISA, Paolo;MASOLI, Francesco Antonio;REGGIANI, DAVIDE;STANCARI, Michelle Dawn;STATERA, Marco;
2003

Abstract

Double-spin asymmetries in the cross section of electroproduction of $\rho^0$ and $\phi$ mesons on the proton and deuteron are measured at the HERMES experiment. The photoabsorption asymmetry in exclusive $\rho^0$ electroproduction on the proton exhibits a positive tendency. This is consistent with theoretical predictions that the exchange of an object with unnatural parity contributes to exclusive $\rho^0$ electroproduction by transverse photons. The photoabsorption asymmetry on the deuteron is found to be consistent with zero. Double-spin asymmetries in $\rho^0$ and $\phi $ meson electroproduction by quasi-real photons were also found to be consistent with zero; the asymmetry in the case of the $\phi$ meson is compatible with a theoretical prediction which involves $s\bar{s}$ knockout from the nucleon.
A., Airapetian; N., Akopov; Z., Akopov; M., Amarian; V. V., Ammosov; A., Andrus; E. C., Aschenauer; W., Augustyniak; R., Avakian; A., Avetissian; E., Avetissian; P., Bailey; V., Baturin; C., Baumgarten; M., Beckmann; S., Belostotski; S., Bernreuther; N., Bianchi; H. P., Blok; H., Bottcher; A., Borissov; M., Bouwhuis; J., Brack; A., Brull; V., Bryzgalov; G. P., Capitani; H. C., Chiang; Ciullo, Giuseppe; Contalbrigo, Marco; G. R., Court; Ferretti, Paola; R., De Leo; L., De Nardo; E., De Sanctis; E., Devitsin; P., Di Nezza; M., Duren; M., Ehrenfried; A., Elalaoui Moulay; G., Elbakian; F., Ellinghaus; U., Elschenbroich; J., Ely; Fabbri, Riccardo; A., Fantoni; A., Fechtchenko; L., Felawka; B., Fox; J., Franz; S., Frullani; Y., Garber; G., Gapienko; V., Gapienko; F., Garibaldi; E., Garutti; D., Gaskell; G., Gavrilov; V., Gharibyan; G., Graw; O., Grebeniouk; L. G., Greeniaus; W., Haeberli; K., Hafidi; M., Hartig; D., Hasch; D., Heesbeen; M., Henoch; R., Hertenberger; W. H. A., Hesselink; A., Hillenbrand; Y., Holler; B., Hommez; G., Iarygin; A., Ivanilov; A., Izotov; H. E., Jackson; A., Jgoun; R., Kaiser; E., Kinney; A., Kisselev; Kay C., Konigsmann; H., Kolster; M., Kopytin; V., Korotkov; V., Kozlov; B., Krauss; V. G., Krivokhijine; L., Lagamba; L., Lapikas; A., Laziev; Lenisa, Paolo; P., Liebing; T., Lindemann; K., Lipka; W., Lorenzon; B., Maiheu; N. C. R., Makins; B., Marianski; H., Marukyan; Masoli, Francesco Antonio; F., Menden; V., Mexner; N., Meyners; O., Mikloukho; C. A., Miller; Y., Miyachi; V., Muccifora; A., Nagaitsev; E., Nappi; Y., Naryshkin; A., Nass; W. D., Nowak; K., Oganessyan; H., Ohsuga; G., Orlandi; N., Pickert; S., Potashov; D. H., Potterveld; M., Raithel; Reggiani, Davide; P., Reimer; A., Reischl; A. R., Reolon; K., Rith; G., Rosner; A., Rostomyan; L., Rubacek; D., Ryckbosch; Y., Salomatin; I., Sanjiev; Igor A., Savin; C., Scarlett; A., Schafer; C., Schill; G., Schnell; K. P., Schuler; A., Schwind; R., Seidl; B., Seitz; R., Shanidze; C., Shearer; T. A., Shibata; V., Shutov; M. C., Simani; K., Sinram; Stancari, Michelle Dawn; Statera, Marco; E., Steffens; J. J. M., Steijger; J., Stewart; U., Stosslein; P., Tait; H., Tanaka; S., Taroian; B., Tchuiko; A., Terkulov; E., Thomas; A., Tkabladze; A., Trzcinski; M., Tytgat; G. M., Urciuoli; P., van der Nat; G., van der Steenhoven; R., van de Vyver; M. C., Vetterli; V., Vikhrov; M. G., Vincter; J., Visser; C., Vogel; M., Vogt; J., Volmer; C., Weiskopf; J., Wendland; J., Wilbert; T., Wise; S., Yen; S., Yoneyama; B., Zihlmann; H., Zohrabian; P., Zupranski
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11392/516832
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