منابع مشابه
Prompt Charmonium Production in Z Decays
The color-evaporation model quantitatively describes all data on photoproduction and hadroproduction of charmonium. Although the model is in part nonperturbative, the associated parameters can for instance be determined from the charmonium photoproduction data. At this point its predictions for the prompt production of ψ’s at the Z pole are made with no free parameters. We show here that this a...
متن کاملCharmonium Production ∗
Theoretical analyses of the results on quarkonium production at large transverse momentum (p T) in p¯ p collisions, at the Tevatron have revealed two novel features of the physics of quarkonium production : 1) the contribution of fragmentation of gluons and charm quarks to the cross-section at large p T , and 2) the importance of colour octet components of the quarkonium wave-function. I discus...
متن کاملProduction of Prompt Photons
After a brief review of the production dynamics of prompt single photons in hadron collisions, I summarize a new QCD calculation of the transverse momentum distribution of continuum prompt photon pairs produced by QCD subprocesses, including all-orders soft-gluon resummation valid at next-to-next-to-leading logarithmic accuracy. Resummation is necessary to obtain reliable predictions, as well a...
متن کاملPrompt-photon production in DIS
In the study of high energy collisions involving hadrons, events in which isolated high-energy photons (often referred to as prompt photons if originating from quarks) are observed provide a direct probe of the underlying parton process, since the emission of these photons is unaffected by parton hadronisation. Isolated high-energy photon production has been studied in hadronic collisions[2] an...
متن کاملcharmonium production at the Tevatron
The production of the P1 charmonium state, hc, at large-pT at the Tevatron is considered. The colour-octet contributions to this state are found to be dominant and give a reasonably large rate for the production of hc. This should make it feasible to look for this resonance in the J/ψ + π decay channel. This production rate is a prediction of NRQCD, and the observation of the hc at the Tevatron...
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ژورنال
عنوان ژورنال: Physics Letters B
سال: 1997
ISSN: 0370-2693
DOI: 10.1016/s0370-2693(97)00040-3