The experimental study of quarkonium production in pp collisions will be reviewed in this talk.
We compute the energy dependence of the pt-integrated cross section of directly produced quarkonia in pp collisions at next-to-leading order within the nonrelativistic QCD framework. We treat the pt-integrated and the pt-differential cross sections as two different observables to investigate whether the CO LDMEs extracted from the fits of the pt-differential cross sections can predict the...
Fragmentation function of gluon to the spin-triplet color-singlet S-wave quarkonium has been calculated numerically earlier in 1992. However, the analytical result is absent because of the complex high dimensional integrals. With the development of the high-loop calculation, we consider to solve the problem with the IBP reduction. I will present our method and the final result, which is...
An overview on recent experimental measurements about quarkonia productions in proton(deuteron)-ion collisions at LHC and RHIC will be presented.
Proton nucleus collisions are expected to be unique tool to probe the physics of the initial state of ultra relativistic heavy ion collisions, without the presence of thermalisation and collective evolution of high energy density QCD matter. However, many observations related to the production of light and strange hadrons at low transverse momentum (pT) in p-Pb collisions at the LHC...
We study cold and hot nuclear matter effects on charmonium production in p+Pb collisions at$\sqrt{s_{NN}}$ = 5.02 TeV in a transport approach. As cold nuclear matter effects give almost the same modification on different $c\bar c$ states at the LHC energy, different nuclear modification factors of $J/\psi$ and $\psi^\prime$ indicate the existence of the hot medium. In forward rapidity, we can...
I will discuss in this talk the mechanisms for quarkonium production and suppression in high energy nuclear collisions from SPS to RHIC, LHC and FCC energies.
We present the first complete study of $\Upsilon$ and prompt $J/\psi$ production from single-parton scattering to the complete O($\alpha_s^6$) for color singlet contribution and including all leading SPS contributions. We find that the effective cross section characterizing the importance of double-parton scatterings is $\sigma_{eff}$≤8.2 mb at 68% confidence level from the D0 measurement. At...
We discuss the stability of tetraquarks systems made of two heavy quarks and two heavy antiquarks, with a potential model whose linear part is inspired by string dynamics.
At variance with some recent or less recent claims, we do not find binding for the double-charmonium or double-bottomonium cases. The string dynamics is, however, more favorable for (bcb̄c̄), i.e., a...
Here is a brief overview on the quarkonium production associated with a vector boson, such as photon, W or Z.