Measurement of J/psi helicity distributions in inelastic photoproduction at HERA

S. Chekanov*, M. Derrick, S. Magill, B. Musgrave, D. Nicholass, J. Repond, R. Yoshida, M. C. K. Mattingly, P. Antonioli, G. Bari, L. Bellagamba, D. Boscherini, A. Bruni, G. Bruni, F. Cindolo, M. Corradi, G. Iacobucci, A. Margotti, R. Nania, A. PoliniS. Antonelli, M. Basile, M. Bindi, L. Cifarelli, A. Contin, S. De Pasquale, G. Sartorelli, A. Zichichi, D. Bartsch, I. Brock, H. Hartmann, E. Hilger, H. -P. Jakob, M. Juengst, A. E. Nuncio-Quiroz, U. Samson, V. Schoenberg, R. Shehzadi, M. Wlasenko, M. Kaur, P. Kaur, I. Singh, M. Capua, S. Fazio, A. Mastroberardino, M. Schioppa, G. Susinno, E. Tassi, J. Y. Kim, A. Pellegrino, ZEUS Collaboration

*Corresponding author voor dit werk

OnderzoeksoutputAcademicpeer review

14 Citaten (Scopus)

Samenvatting

The J/psi decay angular distributions have been measured in inelastic photoproduction in ep collisions with the ZEUS detector at HERA, using an integrated luminosity of 468 pb(-1). The range in photon-proton centre-of-mass energy, W, was 50 <W <180 GeV. The J/psi mesons were identified through their decay into muon pairs. The polar and azimuthal angles of the mu(+) were measured in the J/psi rest frame and compared to theoretical predictions at leading and next-to-leading order in QCD.

Originele taal-2English
Artikelnummer007
Aantal pagina's22
TijdschriftJournal of High Energy Physics
Nummer van het tijdschrift12
DOI's
StatusPublished - dec.-2009

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