The exclusive electroproduction of π+ mesons was studied with the HERMES spectrometer at the DESY laboratory by scattering 27.6 GeV positron and electron beams off an internal hydrogen gas target. The virtual-photon cross sections were measured as a function of the Mandelstam variable t and the squared four momentum −Q2 of the exchanged virtual photon. A model calculation based on Generalized Parton Distributions is in fair agreement with the data at low values of |t| if power corrections are included. A model calculation based on the Regge formalism gives a good description of the magnitude and the t and Q2 dependences of the cross section.

Cross sections for hard exclusive electroproduction of π+ mesons on a hydrogen target

BARION, Luca;CIULLO, Giuseppe;CONTALBRIGO, Marco;DALPIAZ, Pietro;LENISA, Paolo;PAPPALARDO, Luciano Libero;STATERA, Marco;
2008

Abstract

The exclusive electroproduction of π+ mesons was studied with the HERMES spectrometer at the DESY laboratory by scattering 27.6 GeV positron and electron beams off an internal hydrogen gas target. The virtual-photon cross sections were measured as a function of the Mandelstam variable t and the squared four momentum −Q2 of the exchanged virtual photon. A model calculation based on Generalized Parton Distributions is in fair agreement with the data at low values of |t| if power corrections are included. A model calculation based on the Regge formalism gives a good description of the magnitude and the t and Q2 dependences of the cross section.
A., Airapetian; N., Akopov; Z., Akopov; E. C., Aschenauer; W., Augustyniak; A., Avetissian; E., Avetissian; Barion, Luca; S., Belostotski; N., Bianchi; H. P., Blok; H., Böttcher; C., Bonomo; A., Borissov; V., Bryzgalov; J., Burns; M., Capiluppi; G. P., Capitani; E., Cisbani; Ciullo, Giuseppe; Contalbrigo, Marco; Dalpiaz, Pietro; W., Deconinck; R., Deleo; M., Demey; L., De Nardo; E., De Sanctis; M., Diefenthaler; P., Di Nezza; J., Dreschle; M., Düren; M., Ehrenfried; G., Elbakian; F., Ellinghaus; R., Fabbri; A., Fantoni; S., Frullani; D., Gabbert; G., Gapienko; V., Gapienko; F., Garibaldi; G., Gavrilov; V., Gharibyan; F., Giordano; S., Gliske; H., Guler; C., Hadjidakis; D., Hasch; G., Hill; A., Hillenbrand; M., Hoek; I., Hristova; A., Ilyichev; Y., Imazu; A., Ivanilov; H. E., Jackson; S., Joosten; R., Kaiser; T., Keri; E., Kinney; A., Kisselev; M., Kopytin; V., Korotkov; P., Kravchenko; V. G., Krivokhijine; L., Lagamba; R., Lamb; L., Lapikás; I., Lehmann; Lenisa, Paolo; L. A., Linden Levy; A., Lopez Ruiz; W., Lorenzon; S., Lu; X., Lu; D., Mahon; N. C. R., Makins; B., Marianski; H., Marukyan; C. A., Miller; Y., Miyachi; V., Muccifora; M., Murray; A., Mussgiller; E., Nappi; Y., Naryshkin; A., Nass; M., Negodaev; W. D., Nowak; Pappalardo, Luciano Libero; R., Perez Benito; N., Pickert; M., Raithel; P. E., Reimer; A. R., Reolon; C., Riedl; K., Rith; S. E., Rock; G., Rosner; A., Rostomyan; L., Rubacek; J., Rubin; D., Ryckbosch; Y., Salomatin; A., Schäfer; G., Schnell; K. P., Schüler; B., Seitz; C., Shearer; T. A., Shibata; V., Shutov; M., Stancari; Statera, Marco; J. J. M., Steijger; H., Stenzel; J., Stewart; F., Stinzing; J., Streit; S., Taroian; E., Thomas; A., Trzcinski; M., Tytgat; A., Vandenbroucke; P. B., van der Nat; G., Vandersteenhoven; Y., van Haarlem; C., van 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
File in questo prodotto:
Non ci sono file associati a questo prodotto.

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11392/2019012
 Attenzione

Attenzione! I dati visualizzati non sono stati sottoposti a validazione da parte dell'ateneo

Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 58
  • ???jsp.display-item.citation.isi??? 49
social impact