Search

We briefly review recent results which we have obtained in the study of J/ψ +Z production at the LHC. Considering our NLO computation in the Colour Evaporation Model (CEM) as an upper theory limit for the single-parton-scattering contributions, we claim that the existing data set from ATLAS points at a dominant double-partonscattering contribution with an effective cross section smaller than that for jet-related observables. As a side product of our analysis, we have computed, for the first time, the one-loop QCD corrections to the J/ψ PT -differential cross section in the CEM. [ABSTRACT FROM AUTHOR]

The necesscity of the color-octet mechanism in describing heavy quarkonium production is a longstanding puzzle. Compared to the yields of heavy quarkonium, its polarizations should be a sensitive observable to pin down the color-octet contributions. In this talk, I will focus on the χc polarization in hadroproduction processes, which may provide a unique test for the color-octet mechanism in nonrelativistic QCD. [ABSTRACT FROM AUTHOR]

The necesscity of the color-octet mechanism in describing heavy quarkonium production is a longstanding puzzle. Compared to the yields of heavy quarkonium, its polarizations should be a sensitive observable to pin down the color-octet contributions. In this talk, I will focus on the Xc polarization in hadroproduction processes, which may provide a unique test for the color-octet mechanism in nonrelativistic QCD. [ABSTRACT FROM AUTHOR]