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-2 | English |
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Artikelnummer | 007 |
Aantal pagina's | 22 |
Tijdschrift | Journal of High Energy Physics |
Nummer van het tijdschrift | 12 |
DOI's | |
Status | Published - dec.-2009 |