Testing quarkonium production with photoproduced J/{psi}+{gamma}
- Department of Physics and Astronomy, The Johns Hopkins University, 3400 North Charles Street, Baltimore, Maryland 21218 (United States)
I compute the leading color-octet contributions to the process {gamma}+p{r_arrow}J/{psi}+{gamma}(+X) within the nonrelativistic QCD (NRQCD) factorization formalism. In the color-singlet model, J/{psi}+{gamma} can only be produced when the photon interacts through its structure function, while the color-octet mechanism allows for production of J/{psi}+{gamma} via direct photon-gluon fusion. Resolved photon processes can be distinguished easily from direct photon processes by examining the fraction of the incident photon energy carried away by the J/{psi} in the event. Therefore, this process provides a conclusive test of the color-octet mechanism. J/{psi}+{gamma} production is particularly sensitive to the NRQCD matrix element which figures prominently in the fragmentation production of J/{psi} at large p{sub {perpendicular}} in hadron colliders. I also examine the predictions of the color evaporation model (CEM) of quarkonium production and find that this process can easily discriminate between the NRQCD factorization formalism and the CEM. {copyright} {ital 1997} {ital The American Physical Society}
- OSTI ID:
- 477091
- Journal Information:
- Physical Review, D, Journal Name: Physical Review, D Journal Issue: 7 Vol. 55; ISSN PRVDAQ; ISSN 0556-2821
- Country of Publication:
- United States
- Language:
- English
Similar Records
J/{psi} production in top quark decays
Photoproduction of J/{psi} in the forward region